544 PROCEEDINGS OF THE ACADEMY OP 



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DESCRIPTIONS OF NEW MARINE SHELLS FROM THE WEST COAST OF 



FLORIDA. 



BY ROBERT E. C. STEARNS. 



Anachis semiplicata, Stearns. 



Shell small, solid, elongated-ovate ; spire elevated, pointed ; 

 whorls 7-8; slightly convex, with inconspicuous revolving grooves, 

 which latter become prominent on the lower portion 

 ^iS- ^- of the body-whorl; upper portion of the basal, and a 

 portion of the contiguous volution marked by 9-12 

 moderately sharp longitudinal ribs, which become 

 obsolete on the lower part of the basal whorl, and 

 inconspicuous or extinct on the upper whorls, vary- 

 ing in prominence in different specimens ; suture dis- 

 tinct; aperture about half the length of the shell, 

 white, narrow, widest and angulated above ; outer lip 

 simple, thickened near the middle, somewhat thickened, shoul- 

 dered, and curved at its junction with the body-whorl, and no- 

 dosely ribbed within ; inner lip calloused, callous thin, elevated, 

 and finely tuberculated on its inner edge ; canal short, moderately 

 recurved. Number of specimens examined fifteen, of which the 

 largest and smallest measure as follows : — 



Most of the specimens were so coated as not to show the color; 

 when cleansed the surface is of a light sienna-yellow, closely 

 covered with white rounded spots, which frequently coalesce ; apex 

 generally eroded. 



Habitat. — West Coast of Florida; most abundant at Charlotte 

 Harbor, where Col. E. Jewett collected many specimens, also 

 collected by myself at various points on the shores of Tampa 

 Bay. 



The species described herein belongs to a group of Anachids of 

 the same general aspect, of Avhich A. {Columbella) avara, Say, is 

 an illustration. A. semiplicata differs from Mr. Say's shell in 

 having a greater number of whorls, fewer longitudinal ribs, as 

 well as in color markings, and other minor differences. Through 



