464 Zoological Society. 



Shell suborbicular, slightly notched in front, rather gibbous, thin, 

 of a bright light red colour, with white rays and radiating spots ; 

 marginal line straight, slightly sinuated in front ; dorsal valve rather 

 acuminated behind and truncated ; perforation middle-sized, com- 

 plete ; cardinal area rather broad, with sharpish edges ; deltidia 

 rather large and united ; ventral valve somewhat depressed, trans- 

 versely obovate, slightly sinuated in front ; the internal appendage 

 at first forms two rays, then a central ring and two lateral loops, 

 and at length a reflected dorsal loop united to the central ring ; 

 margin of the valves entire. 



From the island of Zebu, attached to coral under stones; H. 

 Cuming. 



Terebratula inconspicua. Ter. testd rotundato-subtrigonali, pos- 

 tice acuminato -rotundatd, antice subsinuatd, obscure rufd; valvis in- 

 cequalibus, glabris ; lined marginali jlexuosd ; valvd dorsali rotun- 

 dato-subtrigond, maximd incompletd; ared cardinali laid, ad utrum- 

 que latus declivi ; deltidiis mediocribus, late discretis ; valvd ven- 

 trali transversim oblongd, subplanulatd, sulco mediano, lato, subin* 

 conspicuo ; margine valvarum integro. 

 Shell rounded, subtrigonal, acuminated and rounded behind, 

 slightly sinuated before, dull red ; valves unequal, smooth ; marginal 

 line flexuous ; perforation large, incomplete ; cardinal area broad, in- 

 clining on each side ; deltidia of moderate size, widely separated ; 

 ventral valve transversely oblong, somewhat flattened, with a broad, 

 rather indistinct mesial groove ; margin of the valves entire. 

 From the late G. Humphrey's collection : locality unknown. 



Terebratula pulchella. Ter. testd subovatd, postice acuminato- 

 rotundatd, lawi, albidd, lineis nonnullis radiantibus rufis ; valvis 

 incequalibus ; lined marginali subfiexuosd; valvd dorsali subpla- 

 nulatd, postice acuminata, antice rotundatd, foramine magno, in- 

 complete ; ared marginali inconspicud, lateribus rotundatis ; delti- 

 diis parvis, discretis ; valvd ventrali subcirculari, planulatd ; ossi- 

 culo interno e gnomone porrecto, antice posito, constante ; margine 

 valvarum integro. 

 Shell subovate, acuminated and rounded behind, smooth, whitish 

 with a few radiating red lines ; valves unequal, marginal line some- 

 what flexuous ; dorsal valve rather flattened, acuminated posteriorly, 

 rounded in front ; perforation large, incomplete ; cardinal area in- 

 distinct, its sides rounded ; deltidia small, separate ; ventral valve 

 somewhat circular, flattened; internal appendage consisting of a 

 single prominent gnomon near the front ; margin of the valves entire. 

 Found by Mr. Cuming attached to corals at Calapan, isle of 

 Mindoro ; also from the island of Cocos, Lieut. Swainson ; in the 

 late G. Humphrey's collection. 



Terebratula cognata, Chemn. Ter. testd subtrapezoidali, antice 

 rotundatd, pallescente, nonnunquam rubente ; valvis incequalibus , 

 radiatim obsolete striatis, versus marginem obliteratis ; lined mar- 

 ginali lateraliter anticeque Jlexuosd ; valvd dorsali convexd, lird 

 mediand inconspicud; apice subacuminato reflexo ; foramine magno, 



