The pa--a^cs in brack. -i- uf i 

 w<rt h's Interpolal i' 



I. i \ 1 1 1:1 1 ii - Shuttleworth, I 'iiiiy 



Shell clliptical-ohluiij, ( -,,nvc\ ; l.i 



with whitish; end valve- .-iihcuiicent rically HIM -ah- and pun- 

 Mt diiin valve- imt c:i rinated ; c, ntral ft] 



impn-sed, becoming transversely cottulftt nibmloate at 1 



lateral areas suhelevated, radiately snh-ulcafe and minutely punc- 



tate-foveolate, Girdle unioolored nil. dm^-iv bc-et with minute 



flattnird icalet, Lrnirtli I L\ l.ivadth H mill. >SI,,,tt/w.) 



SV. '/ ln,, ' . II . 



(Ifchnockiton) A//r/-/////x Snr'rri,\\., hia-n. n. Mull, in 

 i. Mittheil. 1853, p. 75, 

 I havr nut idcntiiicd this sju-cii s, of which Shnttlcwurth wr. 

 I have two specimens. The color i< an int< -nse l.rick red, l.oth 

 iinide and out. It is allied to ( '. cnjtlirnnntti* ( '. H. Ad., lint ditN-r^ 



abundantly in toe sculpture and color, and in the 1< .-> elun-at. d 

 shell. 



4. (,'rnnji of I. 



Small species, apparently smooth, hut under a len.- shuwini: a 

 sculpture of longitudinal rildets or lines of grannies on the central 

 areas, interrupted on the lateral areas, which arc niuirlu-niMl hy 

 peculiar irregular impressions (pi. 1*, tig-. 54,55 . It i- difficult to 

 describe the sculpture of the lateral areas of these >[> i t -- : it i- 

 what ( 'arpenter called " thuinby " or " pollicaroid." 



Diatribution : Antillean and I'anarnic 



Sped i'" ii'ifh >///'//' 



I. STRIOLATUS Gray. PI. 20, figs. 20-24. 



Shell ohloiig, moderately arcln-d, the hack sometime- distinctly, 

 sometimes scarcely visibly keeled; side slope- convex. SB 

 showing no sculpture to the naked eye, hut having the lateral : 

 moderately di-tinct. Color e\ce--ively variable but generally 



either olive-green or olive-slate colored with white ur creamy t!- 

 or cream-culore<l, minutely mottled with light bnwn. The i 

 riur ed^e of each valve i- dolled with light and dark, form 

 sutural articulation. 



