162 PROF. T. RT/PERT JONES ON THE [May 1 894, 



Journ. Geol. Soc. vol. xlvii. p. 546. The footnote at that page refeis 

 to the late Mr. Tawney's section of the Bhsetic beds at Oakfield 

 Road, Clifton, where they are faulted down into the Keuper area; 

 and Mr. Wilson thinks that the specimen under notice may have 

 come from that excavation. 1 



Other possible sources for it, he says, may be the exposures at 

 Cotham, Pylle Hill, and Bedminster ; but these localities could not 

 have been termed ' Clifton.' 



VI. We must not omit to state that from Linksfield, near Elgin, 

 in Morayshire, Scotland, many years since, specimens of some 

 similar Khaetic Ostracoda were supplied by Mr. Patrick Duff, Mr. S. 

 H. Beckles, and Mr. Charles Moore, as fully acknowledged in the 

 Monogr. Eoss. Estherise, Pal. Soc. 1862, p. 75. 



III. Description of the Species. 2 



1. Darwinula liassica (Brodie). (PI. IX. figs. 1 a, lb, 1 c.) 



Length. Height. Thickness of carapace. 

 Eig. 1 a .... -85 # 35 — mm. 



Eig. 1 b .... -7 "3 — mm. 



Eig. lc .... '65 — "35 mm. 



Carapace sub-cylindrical or sub-reniform, varying in outline with 

 slight differences probably due to either individual or sexual growth. 

 The dorsal edge is more or less arched ; and the ventral is somewhat 

 hollowed, and more or less sinuous. The ends are rounded ; but 

 the front end has rather smaller dimensions than the other. Surface 

 smooth. 



The left valve overlaps the right along the back, but in some 

 individuals unequal pressure gives rise to a different appearance. 



The original amount of convexity of the surface can seldom be 

 estimated, on account of the crushed condition of many specimens, 

 the partial embedment of others, and the rarity of exposed edge- 

 views. The carapace, however, is convex along the middle, and 

 thickest at the posterior third (fig. 1 c). 



Some exposed interiors show very simple edges, always somewhat 

 broken. 



With regard to other known species of Darwinula, it is to be 

 noticed that, of several published figures of the small Ostracoda 

 referable to D. leguminella 3 (E. Forbes), none exactly agree in 

 proportions with D. Uassica (Brodie) ; and it differs also from 

 D. Stevensoni, Brady and Bobertson, 4 especially in being less com- 

 pressed anteriorly. 



1 [In this specimen from Clifton several slightly different forms of Darwinula 

 Uassica are recognizable ; and indeed one relatively short form may prove to 

 be specifically distinct.— Feb. 17th, 1894.] 



2 I have to acknowledge Mr. Frederick Chapman's kind help in preparing 

 and sketching most of the Ostracoda here described. 



3 In the Monogr. Foss. Estberiaa, Appendix, 1862, pi. v. fig. 31 ; Quart. 

 Journ. Geol. Soc. vol. xli. (1885) pi. viii. fig. 30 ; Geol. Mag. 1886, pi. iv. fig. 4. 



4 Ann. Mag. Nat. Hist. 1870, and elsewhere, 1874 and 1889. 



