UTRICTLUS. 423 



any. Those from Kiel Bay, which Dr. H. A. Meyer 

 kindly gave me, when I looked over his collection at 

 Hamburg, have a brownish-yellow epidermis. 



Walker described it as Bulla crassa, &c, Adams as 

 B. truncata (nine years after Bruguiere's publication), 

 Maton and Kackett as B. retusa, Schroter (according to 

 Menke's Synopsis) as B. ieveremis, Scacchi (according 

 to Philippi) as B. cylindrica, Chiereghini (according to 

 Nardo) as B. cylindracea, Philippi as B. semisulcata, 

 and Brusina apparently as Cylichna leptoeneilema. The 

 B. truncata of Gmelin is a different species. 



3. U. obtu'sus*, Montagu. 



Bulla obtusa, Mont. Test. Br. (i.) p. 223, t. 7. f. 3. Cylichna obtusa, F. 

 & H. iii. p. 512, pi. cxiv. c. f. 1-3. 



Body whitish : head remarkably short : tentacles placed 

 laterally and standing up like ears, rounded above, and not 

 terminating in points like those of U. truncatulus : eyes not 

 perceptible. (Alder.) 



Shell forming an oblong cylinder, constricted in the middle, 

 and becoming broader towards the base ; it is usually opaque, 

 and rather glossy : sculptui'e, numerous slight lines of growth ; 

 and in young and fresh shells may be sometimes detected under 

 the microscope extremely close-set and fine wavy spiral lines ; 

 spire indistinctly striated across : epidermis skin-like, cream- 

 colour passing into brownish -yellow : colour white : spire short, 

 but very variable in that respect, being in some cases almost 

 truncated, while in others it is more or less extended : whorls 4, 

 slightly angulated at the top ; those in the middle gradually 

 enlarge ; the apical or central whorl is globular and turned 

 inwards : suture deep and narrowly excavated : mouth nexuous ; 

 upper half narrow ; lower half wide, with a rounded base : 

 outer lip gently curved, never extending to the apex ; it re- 

 cedes above, so as to leave a space between the outermost 

 whorl and the next, and is contracted and inflected in the 

 middle ; outer corner rounded ; inner corner obliquely in- 

 curved: inner lip) thicker than in the last species, continuous 

 with the outer lip above ; it is reflected over the pillar, behind 



* Blunt. 



