CHAP, xxn.] MOLLUSCA. 505 



CLASS. CEPHALOPODA. 



* 



Order LDIBRANCHIATA. 



FAMILY 1. AKGOJSTAUTID^E. " Paper Nautilus." (1 Genus, 



4 Species). 



DISTRIBUTION. Open seas of all warm regions. Two species 

 fossil in Tertiary deposits. 



FAMILY 2. OCTOPODIDJE. "Polypi." (7 Genera, 60 



Species). 



DISTRIBUTION. Norway to New Zealand, all tropical and 

 temperate seas and coasts. 



FAMILY 3. TEUTHID^E. " Squids or Sea-pens. (16 Genera, 



102 Species.) 



DISTRIBUTION. Universal, to Greenland ; 2 other genera are 

 fossil, in the Lias and Oolite. 



i 



FAMILY 4 SEPIADJE. " Cuttle Fish." (1 Genus, 30 Species). 



DISTRIBUTION. All seas : 4 other genera are fossil, in Eocene 

 and Miocene deposits. 



FAMILY 5. SPIEULID^E. (1 Genus, 3 Species). 

 DISTRIBUTION. All the warmer seas. 



