1863.] DR. p. p. CARPENTER ON THE SHELLS OF PANAMA. 345 



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

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



9G. Columbella mcesta=Jnachis m. 



97. Columbella 7iicjricans=Anachis n. 



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

 of C. pygmcea, P, 100. 



99. Colu7nhella pulclirior is probably a Nitidella. 



100. Columbella 23yff])icea=A7iachis p., M. 651. 



101. Columbella ru(/osa=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 

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

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

 the spire. 



102. Columbella strombiformis, M. 616. 



103. Columbella tessellata, C. B. Ad. (non G(&%k..)=Anachis (/UU' 

 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 harpceformis. 



107. Ricinula carbonaria=Engina c. 



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

 of the Pacific group Peristernia. 



109. Ricinula reeviana= Engina pulchr a, Rve. 



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

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

 infiata 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, 116( = M. 481), 117, 118*(=M. 

 476), 119* ( = M. A77), 120 ( = M. 475), 121, 122 ( = M. 381, 

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



* Having now examined a large inimbcr of speeiracns of these two forms, I 

 have no hesitation whatever in regarding Coims regalilatis as simply a variety of 

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

 of almost all Cones. 



