340 THE CEPHALOPODA 
Cheiroteuthis, @Orbigny ; with suckers along the whole length of the 
peduncle of the tentacular arms (Fig. 298, A). Doratopsis, Rochebrune ; 
body much elongated, ending ina spine ; dorsal arms very short (Fig. 296) ; 
Atlantic and Mediterranean. Histioteuthis, d’Orbigny ; the six dorsal arms 
are united by a membrane ; the body covered with photogenous organs. 
Histiopsis, Hoyle ; the membrane of the dorsal arms only reaches half- 
way up the arms; luminous organs present. Calliteuthis, Verrill; no 
brachial membrane ; luminous organs present. Grimalditeuthis, Joubin ; 
the fin of each side is divided into two separate lobes: no tentacular 
arms (Fig. 258). Famitry 11. Cranconimpas, Gray. The eight normal 
arms are very short. The eyes prominent. The fins small and terminal. 
Genera— Cranchia, Leach ; body bursiform; sessile arms short; fins 
entirely aboral. Loligopsis, Lamarck; body elongated, conical; tentacular 
arms slender. Leachia, Lesueur ; tentacular arms aborted; the funnel 
without a valve (Fig. 298,C). Taonius, Steenstrup; body elongate ; sessile 
arms rather short; eyes pedunculated (Fig. 253). 
TRIBE 2. MyYopsIDA. 
The members of this tribe are characterised by having a closed 
external cornea, and by having only a single oviduct, viz. that of the 
left side. The internal shell has no longer a distinct phragmocone, and 
is calcified (Sepiidae) or simply chitinous. The Myopsida are more 
littoral in habit than the Oigopsida. 
Fic. 298bis, 
Sepia officinalis, swimming, right-side view. o, arms; ji, fins; fu, funnel. (After 
Merculiano.) 
Famity 1. Sepipar, d’Orbigny. Body wide and flattened; fins 
narrow and extending the whole length of the body (Fig. 298%). Shell 
caleareous and laminated, forming the “sepion.” Genera— Belosepia, 
Voltz; a rudiment of the rostrum and phragmocone present; Eocene. 
Sepia, Linnaeus ; shell with a rostrum (Figs. 262, B, and 299); British, 
Sepiella, Steenstrup ; shell without a rostrum. Faminy 2. SEPIOLIDAE, 
Leach. Body short, rounded at the aboral end; fins rounded, inserted 
on the middle of the length of the body. Shell chitinous, narrow 
and shorter than the body, or absent. Genera—WSepiola, Leach ; head 
united to the mantle in the anterior (dorsal) region ; a fossorial British 
genus. Rossia, Gray; head not united to the mantle; British. 
