:350 



radiated grooves and rounded small marginal teeth; fig. 30, an 

 unusually oblong and acuminated variety ; fig. 32, a rather young 

 shell witii very slight traces of radiating grooves ; fig. 33, another 

 variety with obsolete grooves, obsolete marginal teeth and the pos- 

 terior apex of the dorsal valve more lengthened and recurved. 



14. Teuebratula recurva (pi. Ixix. f. 34<-S6.) Q,uoy. 



Testa rotnndato-subtrigona, gibbosa, pallescente, valvis perinse- 

 qualibus, glabris, obsoletissime radiatim sulcatis ; linea marginali 

 postice lateraHter fl,exuosa, antice subsinuata ; valva dorsali suba- 

 cuminata, obtusa, subrugosa, ad apicem reflexa ; carina mediana 

 obsoleta, foramine mediocri, integro ; area cardinali lata, subincon- 

 spicua, marginibus rotundatis, deltidiis magnis, coalescentibus ; 

 valva ventraU gibbosa, trans\'ersim longiori^ sulco mediano incon- 

 spicuo, lato ; ossiculo interno ut in T. cmstrale ; margine valva- 

 rum undulato. 



Shell rounded subtrigonal, gibbous, of a pale colour, valves 

 very unequal, smooth, very obsoletely radiately grooved, marginal 

 line flexuous posteriorly towards the sides, slightly sinuated in 

 front ; dorsal valve somewhat acuminated, obtuse, rather rugose, 

 reflected ; mesial ridge obsolete ; perforation of moderate size, 

 entire ; cardinal area broad, rather indistinct, with rounded sides ; 

 deltidia large, united in the middle ; ventral valve gibbous, broader 

 than long ; with an indistinct mesial furrow ; internal appendages 

 as in T. Australis ; margin of the valves undulated. 



Tliis may be merely a variety of T. Australis, it may however be 

 easily distinguished by its much recurved beak, Australia, Mr. 

 Cuming. 



15. Tkrebratula rubella (pi. Ixix. f. 40-42.) Sowb. 



Testa subovata, postice subacuminata, subgibba, antice subsinu- 

 ata, rubra, valvis ina^qualibus, glabris, linea marginali rectiuscula, 

 antice subsinuata ; valva dorsali postice subacuminata, reflexa, ca- 

 rina mediana nulla, sulco mediano obsoletissimo , foramine parvo, 

 area cardinali angusta, ad lateres rotundata, deltidiis majusculis, 

 coalescentibus ; valva ventrali ovata, sulco mediano latiuscnlo, 

 emarginationem anticam efformante ; Ossiculo interno ut in T. 

 australe ; margine valvarum Isevissimo. 



Shell nearly oval, rather acuminated posteriorly, a little gibbous 

 and slightly sinuated anteriorly ; valves unequal, smooth ; margi- 

 nal bne nearly straight, a little sinuated in front ; dorsal valve 

 rather acuminated jiosteriorly, reflected, without any mesial ridge ; 

 but with a very obsolete mesial furrow ; perforation small ; cardi- 



