ACM^A. 39 



There is considerable likeness between this species and A.fascicu- 

 laris Mke, a form from the Gulf of California. 



In thin or young specimens the lines of the outside show through 

 the bluish-white internal layer. Sometimes the light ground-color, 

 sometimes the dark markings predominate in the coloration. 



The form called elegatis by Philippi (see pi. 5, figs. 96, 97, 98) 

 differs in having the border very narrow. It was described from La 

 Guayra, Venezuela, in 1846; and if I were assured of its identity 

 with candeana, I would call the species Acmcea elegans, as that 

 name has some years priority over Orbigny's. 



A. candeana is more depressed than A. Carpenteri, with wider, 

 differently marked internal border and different coloration. 



Var. antillarum Sowb. A curious varietal form referable to A. 

 candeana is figured on pi. 42, figs. 92-95. It is decidedly elevated, 

 the surface having minute radiating striae around the apex, becom- 

 ing obsolete below. It is rayed with narrow, light blue stripes on a 

 blackish ground, dotted with blue around the apex. Inside bluish- 

 white, the body-mark deep chestnut in the young and half-grown 

 (fig. 95), but partly overlaid with white in the adult ; border dark, 

 articulated with light. Length 20, breadth 16, alt. 7 2 mill. The 

 specimens were collected at St. Kitts by Dr. Wm. H. Rush, U. S. N. 



I have little doubt that this is the Lottia antillarum, some speci- 

 mens in Dr. Rush's collection agreeing exactly Sowerby's figure. 



Lottia antillarum Sowerby (pi. 5, fig. 7), has never been charac- 

 terized in any way. The original figures are copied on my plate, 

 (see Sowerby, A Conchological Manual, p. 59, fig. 231, 1839.) 



A. CARPENTERI Pilsbry. PL 33, figs. 70, 71, 72, 73. 



Shell oval, rather thin ; apex situated near the anterior third of 

 the length, obtusely rounded ; surface very finely, evenly radiately 

 striated all over, rayed with purplish-pink on a light buff ground, 

 the rays 8-12 in number, the anterior ones narrower; more or less 

 flecked with light brown around the apex. 



Inside white, either immaculate or having a brown spot in the 

 cavity and a narrow outline around the central area ; rays of the 

 exterior generally indistinctly showing through ; margin narrow, 

 buff, with brown spots at the ends of the rays. 



Length 20, breadth 15J, alt. 8 mill. 



West Indies. 



