■s CATALOGUE OF CEPHALOPODA. 



Cryptodibranchia or Brachiocephala Blainv. 1814 ; Diet. Sci. Nat. 



xii. 88. 1818 ; Menke, Syn. 

 Antliobranchiophora Gray, Lond. Med. Pep. 1821. 

 Mollia Eichivald. 

 Cephadelia Cephalopodia Rqfin. Anal. Nat. 138. 1815. 



Synopsis of Orders. 



Subclass I. Axtepedia. — Body naked. Shell none, or internal. 

 Head separate, with eight or ten fleshy arms furnished 

 with cups. Gills two. Siphuncle entire. Foot none. 

 Order I. Octopia. 



Arms eight ; Cups sessile, without any horny ring. No 

 internal medial dorsal Shell. Eyes fixed in the skin. 



Order II. Sephixia. 



Arms ten, two longer; Cups peduncled, with a horny 

 circle. Internal medial Shell. Eyes free in the orbit. 



Subclass II. Polabxaxia. — Body without fins, enclosed in the 

 last chamber of a siphoned-chambered external shell. Head 

 not separate from the body, with a great number of cylin- 

 drical annulated retractile tentacles, without cups. Gills 

 four. Siphuncle slit. Foot-like appendage distinct. 



Order HI. Nautilia. 



Subclass I. Antepedia. 



Body naked. — Shell none, or internal. — Foot none. 

 Head separate, with eight or ten fleshy arms furnished with cups. 

 — Gills two. — Siphuncle entire. 



Cephalopoda nuda Cuvier, Anat. Cornp. 1800 ; Lamck. Ext. d. Cour. 



1812 ; Schwieger, Naturg. 1820. 

 Cephalopoda (testa nulla) Lamck. Phil. Zool. i. 322. 1809. 

 Cephalopoda libera Be Haan, Mora. Amni. 1825. 

 Cephalopoda cryptodibranchia D' Orb. Ann. Sci. Nat. vii. 96. 1826; 



Menke, Syn. 1. 1828, ed. 2. 1. 1830; Grant, Led. 1833. 

 Mol. Cephalorum natantium Sepiadae Flem. Brit. Anim. 225. 



1828. 

 Cephalopoda acetabulifera Ferus. 8f D'Orb. Hist. d. Cephal. 1834 ; 



HOrb. Moll. Viv. et Fos. i. 157. 1845. 

 Cryptodibranchia nuda Blainv. 1814; Diet. Sci. Nat. xii. 88. 



1818. 

 Cryptodibranchiata Blainv. Diet. Sci. Nat. xxxii. 172. 1824. 

 Cephalopoda Leach, Zool. Misc. iii. 1817. 



