494 



divisa ; antice in medio et ad inarginem dorsaleni longitudinaliter 

 striata, radiatim costata, ad marginein ventralem laevigata ; pos- 

 tice la3vigata, marginibus longitudiue insequalibus ; umbonibus 

 lamina testacea expansa coelata. 



The specimen in the British Museum is imperfect, and the 

 locality is not stated. It is divided in the centre by a serrated 

 grove, and the ventral margins of the valves are smooth as in the 

 preceding species. The posterior portion is smooth and tapering, 

 one valve being considerably longer than the other. 



27. Pholas curta (pi. civ. f. 33, 34, pi. cviii. f. 105), Sow., 

 Pro. Zool. Soc, 1834. 



Ph. testa brevi, ovali, clausa, in medio oblique divisa ; parte 

 antica margine ventrali Isevi, ventricoso, medio ad dorsum costata 

 et minute striata; parte postica laevigata; lamina dorsali sub- 

 cylindrica, terminibus subangulatis. 



Oval, divided in the centre, with enclosed tumid ventral margin. 

 The posterior part is short and smooth, with a thin epidermis. 

 The dorsal shield is rather large, oval, straight at the sides, angular 

 at the ends. 



Figure 105 is from a specimen in the British Museum. The 

 other specimens were obtained in soft stone at low water on the 

 coast of West Colombia-, by Mr. Cuming. 



28. Pholas multistriata (pi. civ. f. 35, 36), Sowerhy, Pro. 

 Zool. Soc, 1849. 



Ph. testa oblonga, clausa, transverse oblique divisa; parte 

 antica margine ventrali Isevigato, medio ad dorsum minutissime 

 striata; parte postica lajvigata, laminis attenuata; lamina dorsali 

 ovali, postice circulari, antice subacuminata. 



Eesembling Th. ctirta (f. 33, 34, 105), but the striae on the 

 umboual part of the anterior are very much finer, and the poste- 

 rior termination is elongated. The dorsal shield is more oval, 

 rounded anteriorly, and acuminated posteriorly. 



Collected by J. E. Dring, Esq., E.N., in coral rocks at low 

 water at Tui-tle's Island, on the north coast of Austraha. 



29. Pholas striata (pi. civ. f. 40, 41, 42, pi. cv. f. 43, 44), 

 Linn. Syst. Nat. 1111. Ph. nana, FuUeney. Ph. pusilla, Linn. 

 Syst. Nat. 1111. Ph. lignorum, Spengler. Ph. conoides, Fleming. 

 Ph. clavata, Lamarck, Anim. s. vert. 2nd edit. p. 46. 



Ph. testa clausa, divisa; antice angulatim longitudinaliter 



