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



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

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



96. ColumbeUa mcesta Anachis m. 



97 ColumbeUa nigricans= Anachis n. 



98. Co/umbella parva. This appears to be only a dead specimen 

 of G. pygmaa, P. 100. 



99. ColumbeUa pulchrior is probably a Nitidella. 



100. ColumbeUa pygmtza= Anachis p., IvL 651. 



101. ColumbeUa ruf/osff = Anachis r. This appears to be the 

 commonest and most variable species of the genus. The typical 

 specimens 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. The shape passes from the stumpy to an acuminate form 

 like costellata. 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 

 Jiuctuata by the spiral strise over the whole surface ; and from varia 



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

 the spire. 



102. ColumbeUa strombiformis, M. 616. 



103. ColumbeUa tessellata, C. B. Ad. (non Gask.)= Anachis gua- 

 temalensis, Rve. 



104. ColumbeUa turrita Strombina t. 



105. ColumbeUa varia = Anachis v. 



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

 Cuming., resembling harpaformis. 



107 Ricinula carbonaria=Engina c. 



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

 of the Pacific group Peristernia. 



109. Ricinula r eeviana= Engina pulchr a, Rve. 



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

 series of specimens from Cape St. Lucas with a similar series of C. 

 inflata 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 coarctataLevenia c 



112,113, 114( = M.4SO), 115, 1 16 ( = M. 481), 117, 118* ( = M. 

 476), 119* ( = M. 477), 120 ( = M. 475), 121, 122 ( = M. 381, 

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



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

 have no hesitation whatever in regarding Conm regain atis as simply a variety of 

 C. purpurascens. Similar differences may be obsened in comparing large series 

 of almost all Cones. 



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