Zoological Society. 463 



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

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

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

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

 slante ; 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 ; marginal line somewhat flexuous, reflected in 

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

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

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

 anteriorly slightly attenuated and rounded, its marginal line slanting 

 downwards 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 collections. 



Terebratula RUBicuNnA. (T. sanguinea, Quoy, Astr.) Ter. testd 

 suborbiculari, postice subacuminatd, gibbd, glabrd, rubrd, valvis in- 

 cequalibus, subirregularibus ; lined marginali ad latera subflexuosd, 

 antice sinuatd ; valvd dorsali postice product d , truncatd ; for amine 

 magno, obliquo, subintegro ; ared cardinali rotundatd ; 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, fere 

 ut in T. dorsata efformato ; margine valvarum integro. 

 Shell nearly orbicular, rather acuminated posteriorly, gibbous, 

 smooth, of a red colour ; valves unequal, rather irregular ; marginal 

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

 produced behind, truncated, with a large, oblique, 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, with 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. 



Terebratula sanguinea (sanguinea, Chemn. ; T. erythroleuca of 

 Quoy). Ter. testd suborbiculari, antice subemarginatd, gibbosius- 

 culd, tenui, sanguined, radiis maculisque radiantibus albidis ornatd; 

 lined marginali redd, antice subsinuatd ; valvd dorsali postice 

 subacuminatd, truncatd, for amine mediocri, integro, ared cardinali 

 latiusculd, marginibus subacutis, deltidiis majusculis, coalescenti- 

 bus ; valvd ventrali depressiusculd, transversim obovatd, antice 

 subsinuatd, ossiculo interno primum format radios duos, deinde 

 annulum centralem et amenta duo lateralia, demum amentum su- 

 per urn integrum. 



