362 



parvis, longe discretis ; carina dorsali inconspicua, rotundatd ; valva 

 ventrali transversim oblonga^ antice rotundata, postice in angulo 

 obtusissimo desinente ; sulco mediano subinconspicuo, rotundato ; 

 margine valvarum integro. 



Shell transversely subovate, tliin, rugose, smooth, of a pale 

 colour ; marginal line somewhat flexuous, slightly sinuated in front, 

 dorsal valve of a somewhat tetragonal ovate form, very obtusely 

 angular behind and reflected ; perforation very large, incomplete ; 

 cardinal area large and flattened, deltidia small, very distant; 

 mesial ridge rounded, indistinct, ventral valve transversely oblong, 

 rounded in front, and finisliing in a very obtuse angle behind ; 

 mesial groove rounded, indistinct ; margin of the valves entire. 



In Mr. Norris's Collection, and iu that of M. Janelle. 



38. Tekebratula Labeadorensis (pi. Ixxi. f. 89, 90.) oiohis. 



Testa suborbiculari, postice acimiinata, obtusa, crassiuscula, 

 albida, valvis valde insequalibus, radiatim obsolete costatis ; linea 

 marginali subflexuosa ; valva dorsali antice rotundata, postice acu- 

 minata, obtusa ; foramine magno, integro ; area cardinali magna, 

 subplanulata ; deltidiis majusculis, coalescentibus ; carina dorsali 

 inconspicua; valva ventrali suborbiculari, postice subacuminata, 

 margine valvarum crenulato. 



Shell suborbicular, acuminated behind, obtuse, tliickish, whitish; 

 valves very unequal, obtusely radiately ribbed ; marginal line some- 

 what flexuous; dorsal valve rounded in front, acuminated and 

 obtuse behind ; perforation large, entire ; cardinal area large, some- 

 what flattened ; deltidia rather large, united ; mesial ridge indis- 

 tinct ; ventral valve nearly orbicular, slightly acuminated behind ; 

 margin of the valves crenulated. 



In the British Museum, from Labrador ; C. Goodsir. 



39. Terebratula Algoensis (pi. Ixxi. f. 91, 92.) nobis. 



Testa suborbiculari, postice subacuminata, antice sublobata, 

 albida ; valvis radiatim striatis, carina dorsali conspicua, rotundata ; 

 foramine magno, incompleto ; margine valvse dorsali minutissime 

 crenulato. 



Shell suborbicular, slightly acuminated beliind, rather lobed in 

 front, whitish; valves radiately striated; mesial ridge distinct, 

 roundish ; perforation large, incomplete ; margin of the dorsal 

 valve very minutely crenulated. 



A single valve of the species is in the British Museum, labelled 

 " Algoa Bay ; Bowerbauk." 



