281 DR. P. P. CARPENTER ON NEW SPECIES 



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

 Hab. Acapulco, on Ostrea iridescens, Rowell. 

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

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



CERITHIOPSIS INTERCALARIS. 



C. t. valde elongata, rufo-fusca, marginibus spirce rectis, suturi* 

 impressis ; anfr. nucl. iii. -f ? . . . (decollatis), radiatim di^ 

 tanter liratis ; norm, x., planatis ; costis radiantibus primwr 

 xii., dein circ. xxii., angustis, huud extantibus, ad peripherian' 

 continuis, interstitiis quadratis ; carinis spiralibus primum ii. 

 nodulosis, dein alteris ii. minoribus inter eas intercalantibus ; 

 carina postica suturali hand nodulosa, secunda valde nodulosa, 

 tertia intercalante cequante sed hand nodosa, quarta antica 

 valde nodosa, quinta circa peripheriam, prirnce et tertite simili, 

 hand nodosa, alteraque contioua, minima, inter quas sutura 

 gyrat ; basi concava, lavi ; columella valde cuntorta ; 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 only was 

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



COLUMBELLA HTJMEROSA. 



C. t, parva, turrita, alba, linea sen maculorum serie fusca inter- 

 dum spiram ascendents ; marginibus spirts parum excurvatis ; 

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

 tibus, suturis valde impressis ; costis radiantibus vii.-viii., dis- 

 tantibus, validissimis, rotundatis ; interstitiis late undatis ; 

 lirulis validis smralibus extant'ibus* interstitiis eas aquatitibus, 

 coslai et narum tnterstitia transeuntibus ; basi angusta; labro 

 riv raricoso, postice emarainato, intus solidiore, dentibus 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 Rhizocfieilus, and the tall spire that 

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



MURICIDEA DUBIA, Var. SQUAMULATA. 



Variat i. omnino albida ; sculptura tenuiore ; spira elevata ; tola 



superficie minute squamulata, squamulis imbricatis. 

 Eab. Cape St. Lucas (Xantus). 

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



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

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



274 



