92 



front ; perforation large, nearly entire ; cardinal area large, flattish, 

 with an undulated margin ; deltidia large, separate ; posterior mar- 

 gin of the ventral valve inclined on either side ; internal appendage 

 consisting of a single strong spine standing forward, and with two 

 lateral reflected branches ; margin of the valves crenated. 

 From Santa Cruz, in Mr. Cuming's collection. 



7'erebratula uosea, Humphrey. Ter. testd oblongo-ovali, subde- 

 pressd, antice subattenuatd , crassd, rosed, albicatite radiatim pictd; 

 valvis subcpgualibus, ItBvibus ; l'med marginali subJlexuosd, antice 

 rejiexd; valvd dorsali majori, postice subproductd, truncatd ; fora- 

 mine minimo, integro ; ared cardinali latiusculd, deltidiis coales- 

 centibus, sulco mediano discretis ; valvd ventruli ovali, antice pau- 

 luliim rotundato-attenuatd ; lined marginali ex umbone ad utrum- 

 que latus declivi ; ossiculo costd elevatd, porrectd, simplici con- 

 stante ; margine valvarum integro. 

 Shell of an oblong-oval form, rather depressed, slightly attenuated 

 behind, thick, rose-red, painted with paler radiating marks ; valves 

 nearly equal, smooth ; marginai line some\vhat flexuous, reflected in 

 front ; dorsal valve the larger, rather produced posteriorly and trun- 

 cated ; perforation very small, entire ; cardinal area rather wide, 

 ■vvith united deltidia marked by a mesial groove ; ventral valve oval, 

 anteriorly slightly attenuated and rounded, its marginai line slanting 

 downvvards from the apex on each side ; internal appendage con- 

 sisting of a single elevated rib standing out ; margin of the valves 

 entire. 



From Brazil, according to the late G. Humphrey. In Mr. Cu- 

 ming's and other coUections. 



Terebratula RUBicuNDA. {T . sūnguineū , Q.\ioy , Astv .) Ter. testd 

 suborbicular i, postice subacuminatd, gibbd, glabrd, rubrd, valvis in- 

 tequalibus , subirregularibus ; lined marginali ad latera subflexuosd, 

 antice sinuatd ; valvd dorsali postice productd , truncatd ; f oramine 

 magno, obliguo, suhintegro ; ared cardinali rolundatd; deltidiis 

 magnis, distinctis ; carind dorsali latd, prominente, utrinque ro- 

 tundato-angulatd, obtusd ; valvd ventrali subpentagonali, postice 

 angustiori, mediane latd, rotundato-subangulatd ; antice subtrun- 

 catd, sulco mediano lato, conspicuo ; ossiculo interno magno, feri 

 ut in T. dorsatam efformato ; margine valvarum integro. 

 Shell nearly orbicular, rather acuminated posteriorly, gibbous, 

 smooth, of a red colour ; valves uneąual, rather irregular ; marginai 

 line slightly fiexuous on the sides, sinuated in front ; dorsal valve 

 produced behind, truncated, vvith a large, obliąue, nearly entire per- 

 foration ; cardinal area rounded, deltidia large, separate ; mesial 

 ridge broad, prominent, angularly rounded, and obtuse on both sides; 

 ventral valve somewhat pentagonal, narrow posteriorly, broad in the 

 middle, vvith rounded angles, and slightly truncated in front; mesial 

 groove broad and distinct ; internal appendage as in T. dorsata ; 

 margin of the valves entire. 



From the Moluccas; in Mr. Cuming's collection and in the Bri- 

 tish Museum. 



