. Elementary text-book of zoology [electronic resource]. Zoology. NEPHROPS. 213 remains as a long, grooved spike, which apparently acts for guiding the male sexual elements from the male aperture on to the eggs. In the female the next four are normal, but in the male the second one has a process of the protopodite which gives the whole appendage the appearance of being tri- ramous. The other three are normal. Fig. 140.—The First Pair of SWIMMERETS IN NePHROPS (Ad. nat.) Fig. 141.—The 2nd^ SWIMMERET OF Nephrops ( i ). (Ad. nat.) Fig. 142,—A Ty- pical SwiM- M E R E T OF Nephrops. [Ad. nat.) Prot
. Elementary text-book of zoology [electronic resource]. Zoology. NEPHROPS. 213 remains as a long, grooved spike, which apparently acts for guiding the male sexual elements from the male aperture on to the eggs. In the female the next four are normal, but in the male the second one has a process of the protopodite which gives the whole appendage the appearance of being tri- ramous. The other three are normal. Fig. 140.—The First Pair of SWIMMERETS IN NePHROPS (Ad. nat.) Fig. 141.—The 2nd^ SWIMMERET OF Nephrops ( i ). (Ad. nat.) Fig. 142,—A Ty- pical SwiM- M E R E T OF Nephrops. [Ad. nat.) Protopodite .— bpme X s v- Exopodite. - -~ . Note the spine on Protopodite. the. In both sexes the sixth swimmerets are of large size, the exopodite being jointed. These " \ addles," together with the median felson, form the tail which, on flexion of the abdomen, strikes the water forwards. At least four senses can be recognised in Nephrons, (i) The eyes are paired and situated just below the rostrum upon eye-stalks. They are called compound eyes. Compound eyes are characteristic of Arthropoda and have throughout the group a characteristic structure. They are called compound because they consist of an aggregate of elements called ommatidia, each of which has its own complete optical apparatus. The ommatidia are arranged Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Masterman, Arthur Thomas; Parsons, John Herbert, Sir, 1868-1957, donor; S. H. Lazarus (Firm); University College, London. Library Services. Edinburgh : E. & S. Livingstone
Size: 1180px × 2117px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1901
