CTPKJEA. 19 



dorso elevate ; basi lata planaque, saturate rufescente-fusca, 

 antice posticeque depressiuscula, ; apertura angustata, pos- 

 tice recurva ; dentibus albis, distiuctis, labii externi validis, 

 columellas minus proruinentibus, sulco coluinellari antice 

 profundo lato ; extremitatibus valde productis, canali antico 

 pleno. 



56. harginata, GasTc., (f. 45, 46). — C. testa, ovata, antice 

 subacuminata, postice et mediane valde gibbosa, colore floris 

 lactis, niaculis fulvis paucis irregulariter sparsis ; basi valde 

 plana, et lata ; inarginibus externis mediane fulvo-brunneo 

 punctatis, punctis discretis ; apertura lata, subspirali ; co- 

 lumella, postice gibbosa, sulco parvo antico ; dentibus lateris 

 columellaris circa viginti, late distiuctis, lateris externi 

 asqualibus paululum extensis, antice miuoribus, circa viginti 

 novem ; extremitatibus, postica producta plana,, canalem 

 latum sursuru formante, antica, miuus producta convergente, 

 canalem brevem sursum formante ; spira, valde conspicua, ; 

 marginibus planis, tenuibus, valde extensis. 



57. Thatcheki, Cox, (f. 5, 6). — C. testa pallide carnea, ad 

 dorsum pallide roseo-purpiu'eo suffusa, maculis rotundis 

 sparsis et flammulis castaneis picta; dorso rotundo, inflate; 

 spira rotundatim exserta, extremitatibus obtusis, ad latera 

 planato-subdepressis ; marginibus postice erectis ; basi pla- 

 nulata ; apertura rectiuscula, dentibus rotundatis, columellas 

 6 anticis circa validioribus, labii 6 ad 7 anticis radiatim 

 elongatis. 



Note. — Scottii, Thersites, mwrgvaata, Thatchcri. The two 

 former, although curiously allied, differ so much in propor- 

 tions, that they run no risk of being confounded with eacb 

 other. The thin, flattened, and crenulated base of margi- 

 nata, and its comparative colourlessness, may quite probably 

 be the result of premature formation. If so, it belougs to 

 Thersites. The specimen figured is in the British Museum. 

 Miss Saul's collection includes a specimen slightly resem- 

 bling it, which is a shortened and prematurely formed C. 

 Scottii. C. Thatcheri, as it is now named, has been many 

 years known as a unique shell in Miss Saul's collection, 

 under the name of venusta, but no publication, strictly so- 

 called, can now be proved. The specimen now sent to this 

 country by Mr. Cox, to which it would have been more 

 graceful to have applied the manuscript name, is a larger, 

 and in some respects finer shell, than the one so long kuown. 

 Miss Saul likewise possesses two young shells, which I have 



