22 



XXXVII. Trochus, Liyi. 



Subgenus. Trochus. Shell pyramidal, imperfo- 

 rate. Animal with the inter-tentacular lobes rudi- 

 mentary. 



1. papillosus. 



Trochus papillosus, Mat. and Rac. — T. 

 tenuis, Mont. — T. granulatus, Lam. — T. 

 fragilis, Pidt. 

 Animal with the head and foot white, with brown 

 markings ; tentacula white, with a brown line above ; 

 eye peduncles white ; eyes blue ; lateral lobes and 

 filaments white ; foot with a short filamental appen- 

 dage, or lobe, at each of the anterior angles. 



On the north coast, in deep water. Not common. 



2. Ziziphinus. 



Trochus ziziphinus, Lin. — T. conulus, /3. 

 Phil. — /3. albus, '' T. Lyonsii, Ltach^'' 

 Flem. — 7. purpureus. — Trochus violaceus, 

 Risso ? 

 Animal with the sides of the foot dark orange- 

 brown ; head brown ; tentacula brov/n ; eye-pedun- 

 cles white ; filaments long, brown. 

 Frequent. /3. and y. are rare. 



3. striatus. 



Trochus striatus, Lin. — Trochus conicus, 

 Don. — Trochus erythroleucos, Tiirt. 

 Animal white, the sides of the foot marked with 

 black ; tentacula and filaments, white. 



Subgenus. Meleagris. Shell conoid, umbilicate. 

 Animal with the intertentacular lobes developed. 



