MAZATLAN UNIVALVES 225 



zebrina, D'Orb. 1842, B. M. Cat. Cuba. Moll. p. 23, no. 256. 

 (Jamaica, C. 13. Adams ; Guadeloupe, D' Orbiqny ; Cuba, 

 Sagra.) 



This beautiful shell closely resembles the W. Indian species. 

 Like many of its congeners, it has parallel diagonal lines of 

 colour ; and is also variously and most beautifully stained with 

 red and brown. The first whirl of the five is discoidal. It is 

 characterized by extremely minute wrinkling over the whole 

 surface, only discernible under the microscope, when quite 

 fresh. The umbilicus is very large when young, and sharply 

 keeled : when adult, it is often nearly filled up by the callous 

 labium. Operculum radiately wrinkled over a large part of 

 the outer surface ; within, spire produced, sharply keeled. The 

 largest specimen measures long. *13, lat. *12, div. 70. 



The smallest sp. '032, '037, 90. 



Hab Payta, Panama, E. B. Philippi. Mazatlan ; 12 sp. 



among algae, on Uvanilla elivacea, &c. ; L'pool Col. 



Tablet 1084 contains 5 specimens shewing the principal 

 varieties of colour, red, ashy and mottled, the largest of which 

 has its operculum in situ ; also 2 separate opercula. 



283 b. PHASIANELLA ? PERFOKATA, var. STRIULATA. 



P. t. "P. perforates" simili, sed lineis color is car ente ; rufo 

 punctatd et varie maculatd ; striis spiralibus inlus umbilicum 

 et in basim, nonnunquam supra spirant. 



Only two dead shells having been found agreeing in the 

 above characters, their specific value cannot be tested. One 

 of the specimens is very slender, the other of the ordinary 

 form. There is no trace of the minutely wrinkled surface. 

 Long. *09, lat. '07, div. 50. 

 Hab. Mazatlan ; 2 sp. in shell washings ; Upool Col. 



Tablet 1085 contains the slender specimen. 



284. PHASIANELLA COMPTA, Gould, ms. 



"Pk. t. parvd, solidd, ovato-conica, imperforatd, politd, cin- 

 erascente, lineis minwiis olivaceis, oblique volventibus, ornatd ; 

 anfractibus iv. [v.] rotundatis, ultimo ad peripJieriam subangu- 

 lato, et interdum tessellatim faseiato ; aperturd circulari ; 

 labro tenui, albo ; columelld planulatd, alba ; faucibus callo 

 incrassatis." 



