158 Panama Shells. MITEICID^. 



sub-t[uadrate, efFuse below;' sub-e£fase above: labmia produced 

 very far in the lower half, in old Bhells excessively thickened. 

 ■' Mean diyergence about 82° : length, 1.6 inch ; breadth, .75 

 inch ; length of spire 1.15 inch. 



■ • This species must closely res6mble C, vancosztm' Sowb., and 

 G. varkosum Kieuer,' which are probably distinct from each 

 other. 0. Hegeswichii Phil, is also similar to our shell. (It is 

 to be regretted that Dr. Philippi has not stated which side of 

 Mexico his species inhabits.) Sowerby's shell may be ours. It 

 appears like a dwarfed variety. ' Orbigny considers it as the 

 young of the shell which he had from Guayaquil, but speaks of 

 a circular umbilicus. 



Station. — With G. pulchrum. 



Habitat. — Panama ; B. Jewett ! Gould MSS. 



Panama ; 0. B. A. ! 

 250 specimens were collected with G. pulchrum. 



207. Triplioris alternattis. Nov. sp. 



Shell long, conic, sinistrorsal : blackish red except that in the 

 lower whorls a dingy white spiral stripe occupies the l^wer two- 

 thirds of each whorl : with two stout marginal spiral jidges, and 

 a rather smaller intermediate one, which is wanting on, the upper 

 whorls; with about twenty-five transverse moderately developed 

 ridges, which terminate at the periphery of the last whorl, with 

 the intersections strongly nodulous ; anteriorly with two addi- 

 tional spiral ridges : apex very acute : spire with the outlines 

 slightly curvilinear : whorls twelve, nearly flat, with an indis- 

 tinct suture ; last whorl short, concave anteriorly : aperture 

 rhombic : canal rather deep, short. 



Mean divergence about 30°; length .2 inch; breadth .06 

 inch ; length of spire .155 inch. 



■' ASi!a<io«.-— Unknown. 



