Archive image from page 1095 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 ' Female generative organs of the Lamprey (Petromyxon marimts). a, parietes of abdomen; b, cavity of ditto; c, ovary; e, external passage leading into abdo- minal cavity, through which the ova are discharged; g, kidney. extensive membranous expansion is found sus- pended in loose folds, which is attached by a kind of mesentery beneath the spinal column, and extending along the whole length of the abdominal cavity. Except in the breeding Fig. 535. One of t
Archive image from page 1095 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 ' Female generative organs of the Lamprey (Petromyxon marimts). a, parietes of abdomen; b, cavity of ditto; c, ovary; e, external passage leading into abdo- minal cavity, through which the ova are discharged; g, kidney. extensive membranous expansion is found sus- pended in loose folds, which is attached by a kind of mesentery beneath the spinal column, and extending along the whole length of the abdominal cavity. Except in the breeding Fig. 535. One of the folds of the ovary of the Lamprey, (Petromyzon marimu,) showing the enclosed ova. season, this membrane, of which a portion only is represented in the figure, (Jig. 534, c,) is thin and transparent, but at the same time exhibits considerable vascularity. When the breeding season approaches, innumerable gra- nules begin to make their appearance, between the two layers of which this expansion consists, which in the female soon proclaim themselves to be ova (Jig. 535), and, as they increase in size, gradually distend the whole abdomen. On opening the fish in this condition the abdominal cavity appears to be completely filled with innumerable ova beautifully arranged in rich festoons, all of which are connected in front of the spinal column. When the ova are quite mature they are cast loose from the ovary and escape from the ovarian membrane in which they were formed, into the general ca- vity of the abdomen, wherein they may be found at this period floating quite loose prepa- ratory to their expulsion. This is ultimately effected through a simple but wide orifice (e) situated immediately behind the anal aperture, and causing a free communication to exist be- tween the peritoneal cavity and the exterior of the body, so that the ova easily pass out and are ejected into the surrounding water. In the males of those Fishes which offer this type of the generative system the appeara
Size: 1676px × 1193px
Photo credit: © Bookive / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: 1800, 1840, 1847, americana, anatomy, archive, biodiversity, blc, book, bookauthor, bookcentury, bookcollection, bookcontributor, bookdecade, bookpublisher, booksubject, bookyear, drawing, historical, history, illustration, image, london_sherwood_gilbert_and_piper, mblwhoi, mblwhoi_library, page, physiology, picture, print, reference, todd_robert_bentley_1809_1860, vintage, zoology
