281 DR. V. V. CARPKNTF.R ON NFW SPECIES 



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

 Ilafj. Acapiilco, on Osfrea iridescens, Rowell. 

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

 solid than L. distort a and (?var.) yod. 



Cerithiopsis intercalaris. 



C. t. valde elonyata, rvfo-fusca, margtnihus ipirec recfis, stitvru 

 impressis ; anfr. nitcl. iii. 4- ? . . . {deco/fati-^), radiutim dis' 

 tanter liratis ; norm, x., pfanatis ; costis radiantihus primutr 

 xii., dein eirc. x\ii., anf/ustis, hand extnntihvft, ad peripheriair 

 continuis, inferstifiis qiiadratis ; carinis spiralihus primum ii. 

 nodufosis, dein alferisn. minorihus inter eas interc(dantibua ; 

 carina postica suturali hand nodidosa, seciinda rci/de nodidosn, 

 tertia interculnnte cequante sed hand nodosa, (piarta antica 

 valde nodosa, qitinta circa peripheriain, prim(P et tertice simili, 

 hand nodosa, alferaque contiyna, minima, inter quas sutura 

 gijrat ; hasi concava, Icevi ; columella valde contorta ; canali 

 hrevi, aperto ; ludrol ... * 

 Mab. Guacomayo. 



This heautiful species comes nearest to C. bimnrr/inata, 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 princi[)al ones, and in the radiating sculp- 

 ture being continued to the periphery. One specimen only wai 

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



COLUMBELLA HUMEROSA. 



(/. t. parva, turrita, alba, linea sen macnlorum serie fitsca inter- 

 dum spiram ascendente ; marginibus spirce parum excurvatis ; 

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

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

 fantibus, validissimis, rotundatis ; inferstifiis late nndatis ; 

 lirulis validis siriralibus exfantibus. inferstifiis eas (Equnntibus, 

 coistat et harum interstitin transeuntibiis ; bast angusta ; labro 

 rix raricoso, postice etnarginato, intiis solidiore, dentibus circ. 

 iv. munitis ; apertura late undata, compacta. 



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



Hab. Aeapulco, on Ostrea iridescens, Rowell. 



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

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



MURICIDEA DUBIA, Vaf. SQUAMULATA. 



Variat t. omnino albida ; scitfj)fvra tenviore ; spira elecata ; tola 



snperjicie minute squamnlafa, squamidis imbricatis. 

 Sab. Cape St. Lucas {Xantvs). 

 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 



