.345 



length of the valve, with two narrow little branches and then a 

 broad flexuous loop ; margin of the valves very minutely denticu- 

 lated. 



In Mr. Cuming's collection ; from Japan. Easily distinguished 

 irom T. caneellata of Koch, by its foramen not being entire. 



6. Teuebratula rubua (pi. Ixviii. f. 9, 10, U), Pallas. 

 T. sanguinea. Leach and Lam. ; T. Capensis, C/iemn. 



Testa rotundato-subquadrangulari, tenuiscida^ rubra ; valvis in- 

 tequaliter convexis, (dorsali gibbosa, ventraH planiuscula,) radiatim 

 costatis, costellis^plerumque simplicibus ; linea marginaH ad lateres 

 rectiuscula antice subflexuosa ; valva dorsali subproducta, obhque 

 truncata, foramine magno, hand integro ; area cardinali angusta, 

 declivi, deltidiis parvis ; valva ventrali postice lata, margine rec- 

 tiusculo ; ossiculo interno ramidos duos centrales tlivergentes, ad 

 apices expansos sistente ; margine valvarum crenulato. 



Shell of a rounded somewhat quadrangular form, ventricose, 

 rather thin and of a deep red colour; valves unequally convex 

 (the dorsal being gibbous and the ventral rather flattened,) radi- 

 ately ribbed, the ribs being for the most part simple ; marginal 

 hue nearly straight on the sides, somewhat flexuous anteriorly; 

 dorsal valve slightly produced, obliquely truncated, with a large 

 uicomplete perforation ; cardinal area narrow, inclined, with small 

 deltidia; ventral valve broad posteriorly, with a nearly straight 

 margin ; internal appendages consisting of two central diverging 

 branches somewhat spread out at their ends ; margin of the valves 

 crenulated. 



From South Africa. Fig. 9 and 11 show the ventral and dor- 

 sal valves from a specimen in the British Museum : fig. 10 shows 

 the internal ossicle. 



7. Terebratula Pisum (pi. Ixix. f. 37 to 39.) Lam. T. Nata- 

 lensis, Ku-ster. 



Testa transversim subovata, rufescente; valvis subsquaHbus, 

 radiatim obsolete liratis, liris paucis, obtusis, rotundatis; linea 

 margmali recta, antice profunde sinuata ; valva dorsah paulisper 

 producta, obtusissima ; foramine magno, hand integro ; area car- 

 dinali parva, Hneari ; deltidiis parvis, subtrigonidis ; carina medi- 

 ana lata, magna, rotimdata ; valva ventraH postice latiuscula, mar- 

 gine postico rectiusculo ; sidco mechano magno, lato, rotundato ; 

 margine valvarum obsoletissime subcrenidato ; ossiculo interno ut 

 in T. rubra Pall. 



Shell transversely subovate, slightly reddish ; valves nearly equal, 

 with rather obsolete radiated ridges, which are few, obtuse, and 



