499 



40. Pholas quadka (pi. cvi. f. 62, 63), Sowerhi/, Pro. Zool. 

 Soc, 1834. 



Ph. testa clausa, subovali, canali serrato divisa; parte antica 

 costata et lineata, margiiie ventrali iuflato, cum margiue dorsali 

 confluente, margine dorsali tiunido, diviso, ad umboiies transverse 

 iuciso ; parte postica concentrice striata, ad terminum tumis in- 

 flatis quatuor, et tuba testacea plus minusve elongata. 



Resembling P/^. tridens (f. 60, 61), but with the anterior dorsal 

 margins more inflated, and at the posterior termination having a 

 shelly tube surmounted by four horny tubercles. 



Collected by Mr. Cuming on sand, in loose clay, at Monte 

 Christo. 



41. Pholas tubifer (pi. cvi. f. 64, 65), Sowerby, Pro. Zool. 

 Soc, 1834. 



Ph. testa clausa, subovali, canali serrato divisa; parte antica 

 costata et lineata, margine ventraH inflato, cum margine dorsali 

 confluente, margine dorsali tumido, diviso, ad umbones trans- 

 verse inciso; parte postica concentrice striata; ad terminum 

 spathulis duabus subquadratis, corueis, ad tubam testaceam plus 

 minusve elongatam afhxis. 



Shell enclosed, divided ; the front part costated and imbricated, 

 and the test filling up the ventral gape confluent with the dorsal 

 margin, which is reflected, tumid, and, at the imibones, separated 

 into two small valve-like appendages. Next to the posterior end 

 of the shell are a pair of horny flaps, which are fixed into a shelly 

 tube. In Ph. quadra (f. 62) the tube is surmounted by four 

 lobes instead of these flaps. 



Collected by Mr. Cuming in decayed wood, ten fathoms deep, 

 at the Bay of Caraccas, West Colombia. 



42. Pholas melanura (pi. cvii. f. 78, 79), Sowerhy, Pro. 

 Zool. Soc, 1834. 



Ph. testa, clausa, subovali, canali serrato divisa ; parte antica im- 

 bricatim costata, margine ventrali lajvigato, inflato, dorso conflu- 

 ente, margine dorsali valide reflexo et tumido, ad umbones laminis 

 duabus subquadratis super laminas latas dispositis diviso ; parte 

 postica concentrice lyrata, epidermide nigricante, ad terminum 

 tumis corneis, inflatis, sub-reniformibus, duabus ad tubam testa- 

 ceam affixis. 



Much larger than Ph. quadra, and more boldly sculptured. The 



