514 REV. G. E. WHIDBOENE 015T SOME EOSSILS 



1852. Plicatula Parkinsoni, Quenst. Handb. t. 41. fig. 24. 

 1858. Harpaoc spinosus, Deslongchamps, Mem. Soc. Linn. Norm. 



vol. xi. 1. 10. figs. 26-37. 



I have fonnd specimens which apparently agree with Deslong- 

 champs's shell, t. 10. fig. 33, in the beds below the sands belonging 

 to the Jurensis-zone at Yeovil Junction. 



He states that these shells, which are from the Inferior Oolite of 

 Calvados, do not agree with the one described by Sowerby, which 

 he considers to be a different species from his figure, and which he 

 calls H. ParTcinsoni. 



As, however, Sowerby's name P. spinosa is generally accepted for 

 the common Middle-Lias fossil, there would seem to be no reason 

 for the alteration proposed by Deslongchamps, even had not 

 Quenstedt already given the former name to the present species on 

 account of its occurring in the Pcwlcinsoni-be&s of Germany. 



I have seen several specimens of the true H. spinosus (Sow.) which 

 were said to be from the Inferior Oolite of Half-way House, but on 

 examining them I found reason to believe that they really came 

 from the Middle Lias of the same district. 



Haepax Tawkeyi, n. sp. Plate XV. figs. 18, 19. 



The specimens of this species are all interiors of the left or free 

 valve. Shell irregularly oblate or ovoid, concave interiorly, the 

 fiattish central half being surrounded by a prominent, obtuse, 

 uneven ridge, or pallial line; outside which, the surface slopes 

 steeply down to the margins, and is covered by indications of 30 or 

 40 coarse, short, and very irregular ribs ; muscle-mark large, circu- 

 lar, subcentral and granulated ; hinge well displayed, and consisting 

 of two nearly parallel ridges on each side, meeting each other at a 

 high angle, and enclosing a shallow groove ; shell-structure thin 

 and opalescent. 



Locality. The Ironshot Oolite of Dundry. There are three fine 

 specimens in the Bristol Museum, and one or two in my own collec- 

 tion. The latter I obtained from the quarry near the cross roads. 



Dimensions. 1 j- inch long, by 2 inches broad, and 3 lines deep ; 

 or If inch long, by 1J broad, and 4 lines deep. 



Although the exterior is unseen in any of the specimens, it may 

 be presumed from the characters shown in the interior, that it was 

 ribbed or spined. It is unlike any of the " Plicatules " described 

 by Deslongchamps in the ' Memoirs of the Linnean Society of Nor- 

 mandy,' 1858 ; for though it bears some resemblance to Plicatula 

 pectinula, Desl. loc. cit. 1. 17. fig. 38, it is easily separable from that 

 shell by its larger size, less smoothness, and the characters of its 

 hinge. 



Plicatula fistttlosa, Morr. and Lye. 



1853. Plicatula fatulosa, Morris and Lycett, Gt. Ool. Moll. pt. 2. 

 t. 2. fig. 5. 



1871. PI Jistulosa, Terq. and Jourdy, Mem. Geol. Soc. Fr. Ser. 2. 

 vol. 19, p. 131. 



