Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0201clau Year: 1884 70 MOLLUSCA. rarely present. In the female Argonauta (fig. 543) there is a single- chambered spiral shell with thin walls ; in Spirula (fig. 544) there is a niultilocular spiral shell, the chambers of which are traversed by a siphon. Sub-order 1. Decapoda. In addition to the eight arms, there are two long tentacles between the third and fourth pairs of arms (ventral). The suckers are stalked and provided with a horny rim. The eyes are without a sphincter-like lid. The mantle bears two la
Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0201clau Year: 1884 70 MOLLUSCA. rarely present. In the female Argonauta (fig. 543) there is a single- chambered spiral shell with thin walls ; in Spirula (fig. 544) there is a niultilocular spiral shell, the chambers of which are traversed by a siphon. Sub-order 1. Decapoda. In addition to the eight arms, there are two long tentacles between the third and fourth pairs of arms (ventral). The suckers are stalked and provided with a horny rim. The eyes are without a sphincter-like lid. The mantle bears two lateral fins, and at the mantle edge a well-developed apparatus for closing the mantle opening. An internal shell is present. Fam. Spirulidae. Sjnnila Pcronii Lam., Pacific Ocean. Fam. Belemnitidae. JMcmnift-s digitalis Voltz, Upper Lias. Fam. Myopsidae. With closed cornea and covered lens. Sepia officinal is Lam., Loligo vulgaris Lam., Mediterranean (fig. 531). Si'jiioln vvl(j(irix Grant., Mediterranean, Russia •niurroxoma Fer. d'Orb., Mediterranean, Fam. Oigopsidae. Eyes with widely-opened cornea, so that the crystalline lens is exposed and bathed by the sea-water. Onychoteuthis Lh-htenstei-m Fer., Ommastrephes t octants d'Orb. Sub-order 2. Octopoda. The two tentacles are not Peronii present. The eight arms bear sessile suckers without a horny ring, and are connected at their base by a membrane. Eyes relatively small, with sphincter-like lid. The short, rounded body is without the internal shell, and usually also the fin-like appendages. Mantle without cartilaginous apparatus for closing mantle opening, and attached to the head by a broad band. Funnel without valve ; oviduct paired FIG. 544.— Fam. Octopodae (fig. 530). Octopus vuljaris Lam., 0. man-opus (fig. 535), jLlrdoni' •Hiunchatti Lam. Fam. Philonexidae. Plnloni>.ris Carence Ver., Tremoctopu-x rivlacevs Dell. Ch., Argonauta argo L. The small male is without a shell (fig. 539). The large female possesses fin-li
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