281 DR. p. p. CARPENTER ON NEW SPECIES 



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

 Hab. Acapuico, on Ostrea iridescens, Rowell. 

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

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



CeRITHIOPSIS INTERCALARIS. 



C. t. valde elonyata, riifo-fusca, marginibus spircB rectis, suturi. 

 impressis; anfr. nucl. iii. + ? . . . {decollatis), radiatim dis- 

 tauter liratis ; norm, x., planatis ; costis radiantibus primmr 

 xii., dein circ. xxii., anyustis, haud extantibus, ad peripherioir 

 continuis, interstitiis quadratis ; carinis spiralibus primumW. 

 nodulosis, dein alteris ii. minoribus inter eas intercalantibus ; 

 carina postica suturali hand nodulosa, secunda valde nodulosa, 

 tertia intercalante eequante sed haud nodosa, quarta antica 

 valde nodosa, quinta circa peripheriam, primes et tertice simili, 

 haud nodosa, alteraque contigua, minima, inter quas sutura 

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

 brevi, aperto ; labrol ... * 

 Hab. Guaeomayo. 



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. 



COLTJMBELLA HXJMEROSA. 



C. t. parva, turrita, alba, linea seu maculorum serie fusca inier- 

 dum spiram ascendente ; marginibus spirce parum excurvatis ; 

 anfr. nucl.1 . . . [detritis'] ; norm, vi., convexis, poslice tumen- 

 tibus, suturis valde impressis ; costis radiantibus v\\.—y\\i., dis- 

 tantibus, validissimis, rotundatis ; interstitiis late undatis ; 

 lirulis validis sviralibus exfantihvs. interstitiis eas (eqvantibus, 

 castas et narum mterstitia transeuntibus ; basi angusta; labro 

 ?%v raricoso, postice emarginato, intus solidiore, dentibus circ. 

 iv. munitis ; apertiira late undata, compacta. 



l>ng. -26, long. spir. -15, lat. -13 ; div. 38°. 



Hab. Acapuico, on Ostrea iridescens, Rowell. 



The sculpture resembles that oi Rhisocheilus, and the tall spire that 

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



MURICIDEA DUBIA, var. SaUAMTJLATA. 



Variat t. omnino albida ; sculptura tenuiore ; spira elevata ; tota 



superficie minute sqiiamulata, squamulis imbricatis. 

 Hab. 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. asdmiJafa. 



274 



