from Southern N'xjrr'it. 199 



The sliape of the anterior end, its compressed char.ietcr, 

 and the more or less vertical umbo would sng^'est a relation- 

 siiip to probably a young form of Lutraria elliptica, 

 Lnmarcic, a species occurring in ths Pliocene beds of Europe 

 and England, and which, moreover, exists in the Mecli- 

 terrancan. 



Cuspidaria cf. mstrala, Spengler, sp. 

 (PI. VI. fi,-. 12.) 



Mya rostnttu, Spengler, Skrivt. naturhist. Selskab. Kjubeiihavii, 1708, 



vol. iii. |)1. ii. tig. 16, p. 42. 

 Cuspidaria rodrata, Sacco, Moll. Tevz. Piemonte &c., l!)Ul, vol. xxi.x. 



pi. xxvi. tigs. 35-o7, p. 124. 



Itemarks. — There is only a single specimen to rfpresr.nt 

 tlii.s form of Pelecypod, which cun«ists of a light valve of 

 subtrigonal contour, with a marked anterior globosity and a 

 narrowly rostriform extension postero-ventrally, the sculpture 

 consisting of delicate and irregular striations on a concentric 

 basis, without any evidence of radial ornamentation. The 

 basal border is strongly arcuated in front, becoming after- 

 wards vvidely sinuated as part of the produced posterior 

 ixtension. 



Dimensions. — Height = 9, length = 15 mm. 



With only one example it is difficult to say whether it 

 should be placed with Olivi's cuspidata or iSpeugler's rostrata. 

 both species being regarded by some authors as synonymous 

 and having a similar range in time, viz. from the Up|)er 

 Tertiaries of Europe to the recent period. 



Barnea lagosiensis, sp. n. (PI. VI. tig. 13.) 



Description. — Shdl subcylindrical, thin, inequilateral, 

 umbo at one-third distance of entire length ; anterior end 

 rounded, closed, narrow; posterior region extended, acumi- 

 nate; postero-unibonal margin elongately concave; antero- 

 dorsal margin reflected ; ornamented with equidistant radial 

 costse (about 25) of considerable obliquity, occupying about 

 three-quarters of the surface and crossed by nearly equi- 

 distaiit growth-lines which at the junctions show obscure 

 thickenings or tubercles; posterior surface furnished with 

 lines of growth only. 



Diniennions (largest specimen). — Height = 15, length = 

 46 mm. 



Remarks. — This form is a[)parently closely re'ated to the 

 recent Pkolas Candidas of Linnasus, the type of liisso's genua 



