281 DR. V. p. CARPKNTER ON NEW SPECIES 



Long. -31, long. spir. '21, lat. -09 ; div. 12°. 

 Hab. Acapulco, on Ostrea iridescens, Rovvell. 

 The spire outlines are .scythe-shaped. It is much larger and more 

 solid than L. distorta and (?var.) yod. 



Cerithiopsis intercalaris. 



C. t. valde elonyata, riifo-fusca, marginibus spirce rectis, suturu 

 impressis ; anfr. nucl. iii. +? . . . {clecollatis), radiatim dis* 

 tanter liratis ; norm, y.., planatis ; costis radiantibus primun 

 xii., dein circ. xxii., angustis, hand extantibus, ad peripheriair 

 continuis, interstitiis quadratis ; carinis spiralibus primum ii. 

 nodu/osis, dein alfei-is ii. minoribus inter eas intercalantibus ; 

 carina postica suturali hand nodulosa, secunda valde nodulosa, 

 tertia intercalante cequante sed hand nodosa, quarta antica 

 valde nodosa, quint a circa periplieriam, primes et terticB simiii, 

 hand nodosa, alteraque contigua, minima, inter quas sutura 

 gyrat ; basi concava, IcBvi ; columella valde contorta ; canah 

 brevi, aperto ; labrol ... * 

 Hab. Guacomayo. 



This beautiful species comes nearest to C. bimarginata, C. B. Ad., 

 of which, indeed, the type does not agree with the diagnosis so well 

 as does this specimen. It differs in having other spiral ribs inter- 

 calating between the two principal ones, and in the radiating sculp- 

 ture being continued to the periphery. One specimen ouly was 

 found in the shell- washings, not perfect at the mouth. 



COLUMBELLA HUMEROSA. 



C. t. parva, tiirrita, alba, linea seii maculornm serie fusca inter- 

 dnm spiram ascendente ; marginibus spirce parum excurvatis ; 

 anfr. nucl.1 . . . \detritis'\; norm, vi., convexis, postice tumen- 

 tibus, suturis valde impressis ; costis radiantibus \\\.-\'m., dis- 

 tantibus, validissimis, rotundatis ; interstitiis late undatis ; 

 lirulis validis sviralibus extantibus, interstitiis eas eequantihvs, 

 costas et harum interstitia transeuntibus ; basi anyusta; labro 

 viz varicoso, postice emargi7iato, intus solidiore, dentihus circ. 

 iv. munitis ; apertura late undata, compacta. 



Long. -26, long. spir. -15, lat. -13 ; div. 38°. 



Hab. Acapulco, on Ostrea iridescens, Rowell. 



The sculpture resembles that of Rkizocheilus, and the tall spire that 

 of Anachis ; yet it appears to belong to the restricted typical genus. 



MrRICIDEA DUBIA, Var. SaUAMULATA. 



Variat t. omnino albida ; sculptura tenviore ; spira elevata ; tola 



superficie minute squamulata, squamulis imbricatis. 

 Sab. Cape St. Lucas {Xantus). 

 The opercula in the beautiful specimens sent by jMr. Pease are 



* I forgot to measure the specimen before returning it to the Smitlisonian 

 Inst. ; but it is about the size of C. assimilafa. 



274 



