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 complicated, 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. 



2-i. Terebratula decollata (pi. Ixxi. f. 68-70.) BesT}. 

 Anomia, Chenin. vol. viii. p. 96. A. detruucata, Gmel., T. aperta. 

 Be Blainv., T. detruncata, Phil. 



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

 cescente ; valvis valde inajqualibus, radiatim costatis, Isenbus, cos- 

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

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

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

 trali semicirculari, cardine postice hneari, transverso, recto ; ossi- 

 culo interno costis tribus radiantibus, elevatis, versiis 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, Avith a large incomplete perforation ; ventral valve 

 semicircular, hinge Hne linear, transverse and straight beliind; 

 the internal appendages consist of tlu:ee radiating elevated ribs, 

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

 margin of the valves tliickened. 



From the Coral fisheries in the Mediterranean : common. 



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



Testa minima, transversa, antice rotundata, postice angulata, 

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

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

 linea marginali rectiuscula ; valva dorsali postice obtusa, foramine 



