UTRICULUS. 421 



the stomach of an Astropecten Mullerij and southwards 

 to Christiansnnd (Sars) ; Norway (Lilljeborg) ; Bohus- 

 lan, with Mytilus Adriaticus (Malm) ; Loire-Inferieure 

 (Cailliaud) ; Orotava in the Canaries (M ^Andrew) ; 

 Mediterranean, from the Gulf of Lyons (Martin) to 

 Sicily (Philippi) ; Algiers (Weinkauff) ; Adriatic (von 

 Schrockinger and Brusina) ; ^gean (Forbes) : depths 

 7 to 60 f. 



It is the Bulla striatula (sec. typ. in mus. Brit.) of 

 Forbes, B. minuta of Macgillivray, and B. truncatula of 

 myself. 



2. U. trunca'tulus"^, Bruguiere. 



Bulla truncatula, Brug. in Enc. Meth. (Vers) t. vi. p. 377. no. 10. Cy- 

 lichna truncata, F. & H. iii. p. 510, pi. cxiv. b. 1". 7, 8, and (animal) 

 pi. YV. f. 4. 



Body nearly clear white, with often a tinge of brownish- 

 yellow on the upper part, and minutely frosted : mantle lining 

 the mouth of the shell, and forming an excretal canal at the 

 posterior extremity : head squarish, depressed, cloven and 

 slightly advanced in front of the foot: tentacles large, flat, 

 triangular and rather long, with pointed tips, usually folded 

 or curling back towards the front of the shell [" lying like the 

 ears of a hare close to each side of the neck " (Clark)], but 

 carried nearly erect when the animal is crawling : eyes very 

 small and roimd, apparently sunk within the outer mtegai- 

 ment, placed rather close together in the middle between the 

 head and tentacles: foot oblong, indented in front, and 

 rounded or occasionally nicked behind [" this organ is at times 

 considerably reflected laterally on itself and the front of the 

 shell, and, when the animal is quiescent, assuming a quadri- 

 lobate form " (Clark's MS.)] : gizzard cartilaginous, enclosing 

 three oval corneous yellowish-brown plates, which are studded 

 with squarish black tubercles of different sizes. 



SuELL forming a conical cyhnder, narrow on the upper half, 

 more or less deeply constricted in the middle, and expanding 

 on the lower half ; it is nearly opaque, and glossy : sculjiture, 

 numerous longitudinal striae or fluted ribs on the upper half; 



* Truncated; diminutive. 



