499 



40. Pholas quadra (pi. cvi. f. 62, 63), Sowerly, Pro. Zool. 

 Soc, 1834. 



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

 costata et lineata, margine ventrali inflato, cum margine dorsali 

 conflueute, margine dorsali tumido, diviso, ad umbones transverse 

 inciso ; parte postica concentrice striata, ad terminurn tumis in- 

 flatis quatuor, et tuba testacea plus minusve elongata. 



Resembling Ph. 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 tubifeii (pi. cvi. f. 64, 65), Sowerby, Pro. Zool. 

 Soc, 1834. 



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

 costata et lineata, margine ventrali inflato, cum margine dorsali 

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

 verse inciso ; parte postica concentrice striata ; ad terminurn 

 spathulis duabus subcpiadratis, corneis, ad tubam testaceam plus 

 minusve elongatam affixis. 



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 umbones, 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 melanuua (pi. cvii. f. 78, 79), Soiverby, Pro. 

 Zool. Soc, 1834. 



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

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

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

 duabus subcpiadratis super laminas latas dispositis diviso ; parte 

 postica concentrice lyrata, epidermide nigricante, ad terminurn 

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

 ceam affixis. 



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



