DR. P. P. CARPENTER ON THE SHELLS OF PANAMA. 7 



case this and similar species must be moved to Nitidella, if the oper- 

 culum be (as is presumed) Purpuroid ; or to Avnjcla, if Nassoid. 



96. Colnmbella mcesta = Anachis m. 



97 Colvmbella nigricans= Anachis n. 



98. Colvmbella parva. This appears to be only a dead specimen 

 of C. pyr/mcea, P. 100. 



99. Columbella pulchrior is probably a Nitidella. 



100. Columbella p'ygmcBa = M.nach.is p., '&i. o.il. 



101. Colvmbella rvgcia^ Anachis r. This appears to be tiie 

 commonest and most variable species of the genus. The typical 

 Sjieciniens are somewhat stumpy, with stout knobs. Then the knobs 

 pass into long, compressed ridges, and finally change into narrow 

 bars. These are wide apart, or close, or nearly evanescent on the 

 back. Tlie shape passes from the stumpy to an acuminate form 

 like eostellata. Some adults are more than twice the size of others ; 

 but the same variations are found in both extremes. The colours 

 are generally laid on in patches on the knobby specimens ; in fine 

 flames, on the smoother ones. In all varieties, it is known from 



finctuata by the spiral strise over the whole surface ; and from variu 

 by the shoulder, more or less developed into a keel, on the whorls of 

 the spire. 



102. Columbella strombiformis, M. 616. 



103. Colnmbella tessellata, C. B. Ad. (non G&&\.)= Anachis gua- 

 temalensis, Rve. 



104. Columbella turrita^Strombina t. 



105. Columbella varia = Anachis v. 



106. Columbella sp. ind. is the young of a species in Mus. 

 Cuming., resembling hai-p<Bformis. 



107 Ricinula carbonaria^Engina c. 



108. Ricinula juyosa may be an Engina, but has more the aspect 

 of the Pacific group Peristernia. 



109. Ricinula reeviana^Engina pulchra, Rve. 



110. Cassis abbreviata^Bezoardica a. On comparing a large 

 ■ series of specimens from Cape St. I.ucas with a trimilar series of C. 



injlata from Texas, I was unable to discover any specific differences. 

 It varies greatly, from each ocean, in painting, sculpture, height of 

 spire, &c. 



111. Cassis coarctata=Levenia c 



112. 113, 114(=M.480), 115, 1 16 ( = M. 481), 1 17, 118*(=M. 

 476), 119* ( = M. 477), 120 ( = M. 47.5), 121, 122 ( = M. 381, 

 galeatus), 123 ( = M. 449), 124 ( = M. 448), 125. Stent. 



* Having now examined a large nnmher of specimens of these two forms, I 

 have no hesitation whatever in regarding Convs re^alilatis as simply a variety of 

 t'. purpurascens. Similai differences may be obsened in couifaring large series 

 of almost all Cones. ., n^ 



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