360 



Shell rounded, subtrigonal, acuminated and rounded behind, 

 slightly sinuated before, dull red ; valves unequal, smooth ; mar- 

 ginal line flexuous ; perforation large, incomplete, cardinal area 

 broad, inclining on each side, deltidia of moderate size, widely 

 separated ; ventral valve transversely oblong, somewhat flattened, 

 with a broad, rather indistinct mesial groove; margin of the 

 valves entire. 



From the late G. Humphrey's Collection ; locality unknown. 



34. Tebebratula ptjlchella (pi. lxxi. f. 105-107.) nobis. 



Testa subovata, postice acuminato-rotundata, lsevi, albida, lineis 

 nonnullis radiantibus rufis ; valvis insequalibus ; linea, marginali 

 subflexuosa ; valva dorsali subplanulata, postice acuminata, antice 

 rotundata, foramine magno, incompleto ; area cardinali inconspicua, 

 lateribus rotundatis ; deltidiis parvis, discretis ; valva ventrali sub- 

 circulari, planulata, ; ossiculo interno e gnomone porrecto, antice 

 posito constante ; margine valvarum integro. 



Shell subovate, acuminated and rounded behind, smooth, 

 whitish with a few radiating red hnes ; valves unequal, marginal 

 line somewhat flexuous ; dorsal valve rather flattened, acuminated 

 posteriorly, rounded in front ; perforation large, incomplete ; car- 

 dinal area indistinct, its sides rounded ; deltidia small, separate ; 

 ventral valve somewhat circular, flattened ; internal appendage 

 consisting of a single prominent gnomon near the front ; margin 

 of the valves entire. 



round by Mr. Cnming attached to Corals at Calapan, Isle of 

 Mindoro. Also from the Island of Cocos, Lieut. Swainson ; in the 

 late G. Humphrey's Collection. 



35. Terebbatula lenticulaeis (pi. Ixxii. f. 108-110.) Desk. 

 Mag. deZool. 1S41 pi. 41. 



Testa orbiculari, lentiformi, laevigata, rubra ; valvis subinsequa- 

 libus, linea marginali ex umbone ascendente, deinde rectiuscula, 

 antice obsoletissime subsinuata ; valva dorsali postice subacumi- 

 nata, recurva, foramine parvo, integro ; area cardinab planulata, 

 lateraliter angulata ; deltidiis majuscidis, planis, coalescentibus ; 

 valva, ventrali circulari ; ossiculo interno e costa unica, mediana 

 i longitudinis testa;, et ramubs duobus ex umbone constante ; 

 margine valvarum integro. 



Shell orbicular, lentiform, smooth, dark red ; valves somewhat 

 unequal ; marginal line ascending from the umbo, then nearly 

 straight; and very slightly sinuated in front ; dorsal valve sbghtly 

 acuminated posteriorly and recurved ; perforation small, complete ; 



