474 MOLLUSKS : CEPHALOPODS. 



They frequent rocky shores. They are exposed for sale 

 in the markets of Naples and Smyrna, and in the bazaars 

 of India. They vary from an inch to two feet in length. 

 TEUTHID^E, LOLIGO, OR SQUID FAMILY. This Family 

 comprises cephalopods with an elongated body, fins short, 



Fig. 377- 



Squid, Loligo Bartramii, LeS. One half. Atlantic Coast of the United States. 



broad, and mostly terminal. The internal shell, or pen, 

 consists of three parts, a shaft and two lateral expansions. 



BELEMNITID.E, OR BELEMNITE FAMILY. This Family 

 embraces cephalopods which have a shell consisting of a 

 pen terminating at the hind extremity in a chambered 

 cone. A hundred species have been found imbedded in 

 the rocks, but there are no living representatives. 



SEPIAD.E, OR CUTTLE-FISH FAMILY. This Family 

 comprises cephalopods whose calcareous internal shell 

 or cuttle-bone consists of a broad laminated plate, termi- 

 nating behind in a hollow imperfectly chambered apex. 

 They are distributed world-wide, and are from three 

 inches to three feet long. 



SPIRULID^E. This Family comprises cephalopods 

 whose shell is wholly nacreous, discoidal, whorls separate, 



Fig. 378. 



Spirula Icrvis, Gray. One half. New Zealand. 



chambered, and with a ventral siphuncle. Three species 

 are known, which inhabit warm seas. 



