355 



Shell transversely suborbicular, depressed, truncated posteriorly 

 and very wide, of a brownish colour, and with a nearly straight 

 hinge line ; valves nearly equal, very finely radiately striated ; 

 marginal line rather irregular, nearly straight and slightly sinuated 

 in front ; dorsal valve posteriorly truncated, notched, with a large 

 incomplete foramen ; cardinal area of a lengthened triangular 

 shape, flattened, with minute, inconspicuous deltidia ; mesial ridge 

 small ; ventral valve rather flattened, straight behind, with a small 

 mesial notch, mesial groove rather broad, not very distinct ; in- 

 ternal appendage in general very compbcated, occasionally varying 

 in form ; internal surface radiately granular, the very small granules 

 arranged in close set rows ; margin of the valves entire. 



Abounds on the coast of Sicily and in other parts of the Medi- 

 terranean. 



24. Terebratula decollata (pi. kxi. f. 68-70.) JDesh. 

 Anomia, Chemn. vol. viii. p. 9G. A. detruncata, Gmel., T- aperta, 

 Be Blainv., T. detruncata, Phil. 



Testa transversa, antice rotundata, postice angulata, crassa, fus- 

 cescente ; valvis valde inaequahbus, radiatim costatis, lsevibus, cos- 

 tis obtusis, paucis, linea marginali antice recta; valva, dorsab 

 majori, postice angulata, antice rotundata ; area cardinali magna, 

 trigonali, planulata, ; foramine magno, haud integro ; valva ven- 

 trab semicirculari, cardine postice lineari, transverso, recto ; ossi- 

 culo interno costis tribus radiantibus, elevatis, versus cardinem 

 truncatis, dentibus cardinalibus duobus ad utrumque latus uno ; 

 margine valvarum incrassato. 



Shell transverse, rounded in front, angular behind, thick, 

 brownish, valves very unequal, radiately ribbed, smooth, ribs ob- 

 tuse, few in number ; marginal line straight in front ; dorsal valve 

 large, angular behind, rounded in front ; cardinal area large, trian- 

 gular, flattened, with a large incomplete perforation ; ventral valve 

 semicircular, hinge Hue linear, transverse and straight behind ; 

 the internal appendages consist of three radiating elevated ribs, 

 truncated toward the hinge ; cardinal teeth one on each side ; 

 margin of the valves thickened. 



From the Coral fisheries in the Mediterranean : common. 



26. Terebratula cuneata (pi. kxi. f. 83. 84.) Risso. 



Testa, minima, transversa, antice rotundata, postice angulata, 

 subtruncata, albicante, valvis valde inasqualibus, subrugosis, radia- 

 tim costatis, interstitiis costarum roseis, costis obtusis, perpaucis ; 

 linea marginali rectiuscula; valva dorsali postice obtusa, foramine 



