The Cambridge natural history . appid on the shell, the lastchamber of whicli contains the pos-terior part of the liver, with whicli themendjranous si])lnuicle is connected. Fam. 2. Bchinnitidae.—Arms hookedas in Onyclioteuthis, fins large ; phrag-mocone straight, initial chamber globu-lar, larger than the second, rostrumoften very long, investing the plirag-mocone, pro-ostracum sword- or leaf- Fig. 2iQ.—Sepia officinalis L., , , ^ ^ • i> L 11 with mantle cut away to shaped, rounded m front, seldom pre- ^^^^^ position of internalserved, hdv-sac ])resent.—Lower Lias «ieil- x^- (The ends of t
The Cambridge natural history . appid on the shell, the lastchamber of whicli contains the pos-terior part of the liver, with whicli themendjranous si])lnuicle is connected. Fam. 2. Bchinnitidae.—Arms hookedas in Onyclioteuthis, fins large ; phrag-mocone straight, initial chamber globu-lar, larger than the second, rostrumoften very long, investing the plirag-mocone, pro-ostracum sword- or leaf- Fig. 2iQ.—Sepia officinalis L., , , ^ ^ • i> L 11 with mantle cut away to shaped, rounded m front, seldom pre- ^^^^^ position of internalserved, hdv-sac ])resent.—Lower Lias «ieil- x^- (The ends of the tentacular arms are cut off.) to ( retaceous. The Lelemnitidac are l)elieved to have been gregarious, and tohave lived in shallow water on a muddy bottom. Specimens aresometimes found in which even the ink-sac can be recognised insitu. The relative ])ropoitions of rostrum and phragmocone varygreatly in different groups, the rostrum Iteing in some casestwo feet long, in others only just enclosing the ]> 388 DECAPODA As a rule the rostrum is the only portion which has beenpreserved. FAi\r. 3. Belosepiidae.—Phragmocone short, slightly curved,chambers small, placed at the posterior end of a sepion, rostrumsolid, obtuse.—Eocene (Paris, Bracklesham, etc). Fam. 4. Belopteridae. — Sepion not known; phragmoconecurved, siphuncle on the ventral margin, rostrum well developed,pointed. Principal genus, Spirulirostra.—Miocene of Turin. These two families, with their small, curvedphragmocone and (in the case of the Belose-piidae) large sepion, are clearly intermediate
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
