. Zoology : for students and general readers . Zoology. 294 ZOOLOGY. mental males are degraded, imperfect forms^ with sometimes no mouth or digestive canal. The apparent design in nature of their different sexual forms is to effect cross fertilization. The eggs pass from the ovaries into the body-cavity, where. Fiq;. 228.—Anatomy of Lepas fascicular is. A. c, elx pairs of legs or cirri ; /, fila. nieiirary appencliiges; m, mouth; 5, stomach; h, openings of the liver (f) into the stomach, which is represented as laid open ; i, intestine ; rt, vent ; t, testis ; t\ vasa deferenlia, one cut off;
. Zoology : for students and general readers . Zoology. 294 ZOOLOGY. mental males are degraded, imperfect forms^ with sometimes no mouth or digestive canal. The apparent design in nature of their different sexual forms is to effect cross fertilization. The eggs pass from the ovaries into the body-cavity, where. Fiq;. 228.—Anatomy of Lepas fascicular is. A. c, elx pairs of legs or cirri ; /, fila. nieiirary appencliiges; m, mouth; 5, stomach; h, openings of the liver (f) into the stomach, which is represented as laid open ; i, intestine ; rt, vent ; t, testis ; t\ vasa deferenlia, one cut off; p, male appendage ; 0, ovary ; e, adductor muscle connecting tlie two basal valves; vs, scntal valve ; vc, carinal valve ; vi, tergal valve. Enlarged twice. B. 1. palpus ; 2, mandibles ; 3 and 4, first and second maxillse. 0. Nervous system, s, brain, sending the optic nerves to the nidimentai'y eye (e). each optic nerve having an enlargement near the eye, , the ophthalmic ganglion (0); between 0 and a are the nerves which go to the peduncle ; n, nerve sent to the ad- dvcior scuioi'Uin • i¥, commissure between the supra- and infraoesophageal ganglia {yi) c, c, c, c, c, c, nerves to each of the six feet. Enlarged four times.—After Kingsley. they are fertilized, and remain for some time. They pass through a morula condition, a suppressed gastrnla or two- layered state, and hatch in a form called a NmqMus^ from the fact that the free-swimming larva of the Entomostraca. 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 Packard, A. S. (Alpheus Spring), 1839-1905. New York : Henry Holt
Size: 1546px × 1616px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1879
