3100RE ABNORMAL SECONDARY DEPOSITS. 541 



10. Cypricardia AYiNWooDii, spec. nov. PI. XVI. fig. 27. 



Shell ovately oblong, moderately convex, smooth, inequilateral ; 

 iimbones anterior; anterior side rounded towards tlie ventral margin, 

 posterior side produced, angular ; a well-defined rib or carina passes 

 from the umboncs to the posterior ventral margin, beyond which 

 there is an angulated area. 



It is named after my friend the Rev. H. H. Winwood, P.G.S., the 

 Hon. Sec. of the Bath Naturalists' Club. 



Locality, The Sutton Stone of Sutton. 



11. Oris TRIANGULARIS, sp. uov. PI. XYII. fig. 20. 



Shell small, subtrigonal, thick, much longer than wide ; umbones 

 prominent and but slightly curved outwardly, terminal ; an obtuse 

 carina from the umbones passes to the posterior ventral margin, 

 which is produced, and divides the dorsal surface from a very angu- 

 lated area ; surface covered Avith numerous straight lines of growth, 

 which, on crossing the carina, pass obliquely to the anterior margin ; 

 anterior side slightly rounded ; lunule not exposed. 



It is from the Liassic conglomerate of Holwell ; from the Hierlatz 

 beds on the same horizon Dr. Stoliczka has described the O^is 

 clathrata, from which this species is to be distinguished by its more 

 triangular form. 



12. LniA Deslongchampsii, Stol. PI. XVII. fig. 21. 



Shell convex; broader than long, transversely oval; ventral 

 margin and sides regularly rounded ; surface with faint concentric 

 lines of growth and very fine longitudinal striae, which are most 

 distinct on the younger shells. In certain conditions of the test it 

 also possesses fine punctations. 



It occurs in the Liassic conglomerate of Holwell, and also in the 

 thin bed of Lias at Whatley, in both cases immediately upon Carbo- 

 niferous Limestone. It has been found in the Hierlatz beds by Dr. 

 Stoliczka, and at Pontaine-etoupc-four by M. Deslongchamps. It 

 does not attain the size of L. gigantea, and is generally much more 

 oval transversely than that shell. 



13. LmA DExsicosTA, Qucnst. PI. XVII. figs. 23, 24. 



Shell rather small, convex, obliquely ovate ; anterior side and 

 margin rounded ; posterior side extended, round ; auricles small, 

 nearly equal ; lunule small ; surface with longitudinal costaj. 



Locality. The Liassic conglomerate of Holwell. It occurs also on 

 the Hierlatz. 



The following species also occur with the above at Holwell ; but, 

 owing to the density of the matrix, none have yet been obtained in 

 very good condition : — 



Pecten imlosus, Stol. PI. XVII. fig. 27. 



Pectenliollei, Stol. PI. XVII. fig. 25. 



Pecten verticillas, Stol. PI. XVII. fig. 20. 



lAma scrobiculata, Stol. PI. XVII. fig. 22. 



