. Outlines of zoology. se strange butefficient bombs will explode. Theliberated spermatozoa are of the usualtype. The ovary—a large, rounded whiteorgan—lies freely in a peritoneal sacnear the apex of the visceral this sac the eggs pass along ashort direct oviduct, which opens intothe mantle cavity to the left of the with the oviduct, and pouringviscid secretion into it, are two large nidamental glands, of foliated struc-ture. Close beside these are accessoryglands, of a reddish or yellowish colour,with a median and two lateral lobes ;while at the very end of the ovidu
. Outlines of zoology. se strange butefficient bombs will explode. Theliberated spermatozoa are of the usualtype. The ovary—a large, rounded whiteorgan—lies freely in a peritoneal sacnear the apex of the visceral this sac the eggs pass along ashort direct oviduct, which opens intothe mantle cavity to the left of the with the oviduct, and pouringviscid secretion into it, are two large nidamental glands, of foliated struc-ture. Close beside these are accessoryglands, of a reddish or yellowish colour,with a median and two lateral lobes ;while at the very end of the oviduct aretwo more glands. All seem to contributeto the external equipment of the egg. The spermatophores pass from thegenital duct of the male to the fifthleft arm, which becomes coveredwith them and quaintly modification of one of the armsusual among cuttlefish; indeed,some, Argonatita and Trem-octopus, the modified arm, with itsload of spermatozoa, is dischargedbodily into the mantle cavity of the. Fig. 220. — Male of Argo-nauta (after Jatta), show-ing hectocotylus arm;compare Fig. 9 of female. GENERAL NOTES ON MOLLUSCS. 411 female. There its discoverers described it as a parasitic worm, Hectocotylus. The lost arm is afterwards regenerated. In Sepia,however, the modified arm is not discharged, but is simply thrust intothe mantle cavity of the female. The spermatophores probably enterthe oviduct, and burst there.
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu3192, booksubjectzoology
