36 
CATALOGUE OF CEPHALOPODA. 
M. D’Orbigny separates this order into two suborders (Moll. 
Cuba , i. 7. 1841) thus : 
i. Myopsidce Eyes covered with the skin, without immediate 
contact with the water: this will contain Cranchiadce, Sepiadce , 
Spirulidce , and Loligidce, 
ii. Oigopsidce. Eyes open externally, in immediate contact with 
the water : Loligopsidce , Chiroteuthidce , Onydioteuthidce , and 
Belemnitidce. 
Synopsis of Families. 
A e Shell solid, horny. — Chondrophora. 
Mantle supported by two internal fleshy Bands. (Allied to Octo- 
pidae.) 
I. Ce an chi AD cE. Eyes covered with the skin. Siphuncle 
with a valve. 
II. Loligopsidje . Eyes naked. Siphuncle simple. 
38. Mantle furnished with three internal Cartilages; one dorsal, two 
ventral . 
III. Chiroteuthidce. Eyes naked, simple above. Siphuncle 
simple. 
IV. Ohychoteuthidm. Eyes naked, with a sinus above. Si- 
phuncle with a valve. 
V. Loligidm . Eyes covered with skin, simple. 
B. Shell cellular, calcareous. Mantle with two cartilaginous Ridges 
on ventral side. — Sepiaphora. 
VI. Sepiadae. Eyes covered with skin. Head united to mantle 
by a broad cervical band. 
C. Shell chambered, siphoned, calcareous or horny. — Belem- 
nophora. 
VII. SpiruliDcE. Shell spiral, whorls separate. 
VIII, Belemnitidm. Shell straight. 
