312 Dr. P. P. Carpenter on new Forms of Mollusks 



tuse angulatis, umbonibus conspicuis ; ligamento tenui et cartila- 

 giiie subinternis ; nyraphis intortis : dent. card, utriusque valvae ii., 

 quarum i. bifidus ; dent. lat. valvse dextrae ii. ; sinu pallii irregula- 

 riter ovali, per duos trientes interstitii porrecto ; cicatr. adduct. 

 subovatis, nitidissimis. Long. 1-9, lat. 1-4, alt. -44 poll. 



4. Psammobia {lAmphichana) regularis, 

 P. testa minore, regulariter ovali, subsequilaterali ; violacea, plus 

 minusve radiata seu maculata ; Isevi, striolis incrementi ornata ; 

 epidermide tenui, flavido-olivacea induta, postice rugulosa ; mar- 

 ginibus undique regulariter excurvatis ; umbonibus vix projectis ; 

 ligamento conspicuo : intus dent. card, ii.-i., hand bifidis ; cicatr. 

 adduct. postica rotundata, antica ovali ; sinu pallii elongato, baud 

 incurvato, per duos trientes interstitii porrecto. Long. 1*05, lat. "5, 

 alt. -26 poll. 



5. Callista pollicaris. 

 C. testa magna, ventricosa, solidiore ; epidermide tenuissima induta ; 

 sordide albida, umbonibus rufo-fuscis ; (t. adolescente) punctulis 

 crebris rufo-fuscis, et tseniis paucis circa nymphas ornata ; Isevi, 

 striis incrementi exceptis ; postice, et paululum antice, quasi pol- 

 lice impresso notata ; latiore, antice producta, sed baud angulata ; 

 postice unda depressa, supra nymphas radiante, inter costas duas 

 obsoletas sinuante, margine subtruncato ; marginibus ventrali 

 regulariter excurvato, dorsali rectiore ; lunula elongata, linea im- 

 pressa definita, medio tumente, postice flaccida : intus Candida; 

 dent. card, normalibus ; dente laterali valvse dextrse postico, valvse 

 sinistrse antico, usque ad extremitatera lunulae porrecto ; cicatr. 

 adduct. subrotundatis ; sinu pallii magno, rotundato, usque ad 

 medium interstitii porrecto. Long. 2*58, lat. 2*25, alt. 1*43 poll. 



Figured by Mr. Reeve (Conch, f. 45) as " Dione prora, var." 

 The above diagnosis proves it to be a distinct and (considering 

 the general similarity of the thin, colourless, inflated group) a 

 well-marked species. 



6. Callista {^.pannosa, var.) puella. 



C. testa "C, paiinosee " simili, sed multo minore, tenuiore, plerum- 

 que latiore ; sinu pallii majore, eleganter incurvato ; dent. card, 

 multo tenuioribus, lat. ant. magis elongato ; lamina cardinali um- 

 bones versus sinuata: colore maxime variante; nonnunquam ut 

 in C. pannosa triangulariter maculata ; plerumque ut in Tapete 

 virginea notata ; interdum albida, seu aurantia, seu fusca, baud 

 maculata ; rarius ut in Tapete fuscolineata penicillata ; rarissinie 

 paucistrigata, seu maculis paucissirais. Long. 'GG, lat. -5, alt. '32 

 poll. 



Variat t. transversa. Variat quoque t. subtrigona, et formis inter- 

 mediis. 

 Quoted by Mr. Reeve, under JDione pannosa, as " D. puella, 



Cpr."; but the name was only given in MS. in accordance with 



