356 



maximo incompleto ; area cardinal! magna, planulata ; valva ven- 

 traJi depress^ late suborbiculari, margine postico recto, mediane 

 emarginato ; ossiculo interno e costa unica constante ; margine val- 

 varum crenato. 



Shell very small, tranverse, rounded in front, rather angular 

 and truncated behind, whitish, valves very unequal, rather rough, 

 radiately ribbed, ribs very few, obtuse, their interstices rose- 

 coloured ; marginal line nearly straight ; dorsal valve obtuse, with 

 a very large incomplete perforation ; cardinal area large, flattened ; 

 ventral valve depressed, broadly suborbicular, its posterior margin 

 straight, notched in the middle ; the internal appendage consists 

 of a single rib ; the margin of the valves is crenated. 



Found on the coast of Sicily and at Nice. . In Mr. Cuming's 

 Collection. 



26. Tekebkatula lunifera (pi. lxxi. f. 85 . 86.) Phil. 



Testa minima, subcordata, depressa, punctata, (punctis magnis) 

 hyalina, albicante, valvis subsequalibus, hevibus, politis, antice 

 emarginatis ; area cardinali parva, foramine magno, trigonali, in- 

 completo ; ossiculo interno e costa unica, elevata constante ; mar- 

 gine valvarum subcrenato. 



Shell very small, somewhat cordiform, depressed, dotted, (with 

 unusually large dots,) hyaline, whitish ; valves nearly equal, smooth, 

 polished, notched in front ; cardinal area small, with a large in- 

 complete triangular perforation ; internal appendage consisting of 

 a single elevated rib ; margin of the valves slightly crenated. 



We do not find in this species the sort of internal appendage 

 described by Philippi. In Mr. Cuming's specimens it is nearly 

 similar to that of T. cuneata, though the shells are in other res- 

 pects very different. From the coast of Sicdy. 



27. Tekebeatula seminulum (pi. lxxi. f. 87. 88.) Phil. 



Testa, subtransversa, suborbiculari, compressa, postice acumi- 

 nata, antice emarginata, fulvescente ; valvis insequalibus, radiatim 

 costatis, costis perpaucis, rotundatis, subobsoletis ; valva, dorsali 

 postice acuminata, foramine magno, incompleto, trigonali, area, 

 cardinali mediocri, planulata, deltidiis parvis angustis ; valva 

 ventrali transversa, linea cardinali recta, ; ossiculo interno e costa 

 elevata, submediana unica constante ; margine interno valvarum 

 incrassato, granoso. 



Shell somewhat tranversely suborbicular, compressed, acumi- 

 nated posteriorly, emarginated in front and of a pale fulvous 

 colour, valves unequal, with very few radiating ribs, which are 



