. The British Tunicata; an unfinished monograph. Sea squirts; Tunicata. MOLGQLA CITEINA. 63 The branchial sac (PL XXVI, fig. 8, PL XXVIII, figs. 3 and 4) displays well on its exterior the mouths of the branchial pouches, placed in not much curved longi- tudinal rows. These orifices are large, oval, and pretty equal in size, and the primary vessels are seen between them radiating backwards. The folds a,re rather wide, not much curved, and prettily marked by the spiral and the primary vessels; and their sides are supplied with three widish membranous rods. The spiral arrange- ment of the seconda
. The British Tunicata; an unfinished monograph. Sea squirts; Tunicata. MOLGQLA CITEINA. 63 The branchial sac (PL XXVI, fig. 8, PL XXVIII, figs. 3 and 4) displays well on its exterior the mouths of the branchial pouches, placed in not much curved longi- tudinal rows. These orifices are large, oval, and pretty equal in size, and the primary vessels are seen between them radiating backwards. The folds a,re rather wide, not much curved, and prettily marked by the spiral and the primary vessels; and their sides are supplied with three widish membranous rods. The spiral arrange- ment of the secondary vessels is not very obvious between the folds, but becomes quite distinct within them ; where the spirals are placed in pairs, two pairs occupy each pouch formed or bounded by the large. FIG. 46.—Reproductive organs of Molgula citrina. Magnified. primary vessels. The oral lamina differs from that of all the other species in being of nearly equal width throughout; it is in fact rather narrower near the mouth, instead of widening as usual. The branchial tubercle (PL XLVIII, fig. 3) is in the form of a simple loop opening downwards. The tentacular filaments (PL XL, fig. 4) are twelve or fourteen in number, bipinnate, irregular in size and well developed. The alimentary canal (, fig. 6; PI. XXVIII, tig. 5) forms a simple loop, which, on reaching the dorsal margin, turns upwards and becomes perpendi- cular ; the stomach is very slightly marked, being very little wider than the rest of the canal. The liver. 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 Alder, Joshua, 1792-1867; Hancock, Albany, 1806-1873; Hopkinson, John, 1844-1919; Norman, Alfred Merle, 1831-1918; Embleton, Dennis, 1810-1900. London, Printed for the Ray society
Size: 1917px × 1304px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpubli, booksubjectseasquirts
