166 PROF. T. RUPERT JONES ON THE [May 1 894, 



above, p. 160), in the Charles-Moore Collection, Bath Museum, 

 labelled ' Cypris Hassiea.' This is, however, quite different from 

 that form, and probably came from the Lias of the locality 

 mentioned. 1 



Being sufficiently distinct, it may be appropriately named after 

 its discoverer, -who devoted much time and labour to the study of 

 the Lias and Rhsetic beds. 



Numerous individuals having the same shape, but not dark- 

 coloured, crowd the bed-plane and constitute a small thickness of a 

 piece of yellowish limestone, from Long Itchington in Warwickshire 

 (collected by the Itev. P. B. Brodie some time ago). 



"With Cytheridece having this subtrigonal character we can 

 associate the form described and figured by Terquem as Cypris 

 liassica in 1855 (see above, p. 159) ; also Salter and Woodward's 

 fig. 87, ' Cythere liassica,' 1865 (see above, p. 158). 



5. Cttheridea, sp. (indeterminable). (PL IX. fig. 9.) 



Length. Height. 



1-3 mm. - 9 mm. 



This seems to be the right valve of a large, smooth Cyiheridea, 

 but it is not sufficiently exposed from the matrix for definite deter- 

 mination. It occurs in a small piece of compact yellowish limestone, 

 collected by the llev. P. B. Brodie some years since, and labelled 

 ' Bristol.' The matrix is not like any of the known Rhaetic lime- 

 stones of that locality, and it may have come from some neighbour- 

 ing exposure of the Lower Lias. 



6. CrTHERE RETICOSTATA, sp. n0V. (PI. IX. fig. 10.) 



Length. Height. 



1*25 ? mm. *7 mm. 



This is a fine, strong, obliquely-subquadrate valve. The front 

 edge slopes from the antero-ventral corner to the anterior hinge, 

 and bears a thickened edge, which dies out along the oblique dorsal 

 margin before reaching the contracted and rounded hinder extremity. 

 The ventral margin is also oblique, and nearly straight as far as 

 can be seen. The surface is ornamented with a row of pits within 

 the anterior border, accompanied with parallel ridges, which, passing 

 along the dorsal region, are connected by an open meshwork ; and 

 this appears to become rather looser and less marked on the rest of 

 the surface, as far as exposed. 



This kind of ornament is not unusual among the Cytheridce. 

 Both for shape, partially, and the arrangement of riblets and reticu- 

 lation, some resemblance is noticeable in Cythere septentrionalis, 

 Brady. 2 



1 For the section, see Quart. Journ. Geol. Soc. vol. xvii. (1861) pp. 485, 486. 



2 Trans. Zool. Soc. vol. v. (1866) pi. lx. fig. 4; and Trans. Boy. Dubl. Soc. 

 ser. 2, toI. iv. (1889) pi. xvi. fig. 13. 



