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



Entom. pi. iv. fig. 8, p. 18) as at first supposed. They are much 

 more like those of Darwinula. 1 



The edge view of the carapace or of either valve cannot be 

 satisfactorily determined, because of their generally crushed state. 



This species from Linskfield, near Elgin, 2 is so much broader 

 (higher) than known Darwinula? that it may probably belong to the 

 genus of that larger form, somewhat similar in shape, referred to 

 Cyprione in Quart. Journ. Geol. Soc. vol. xli. (1885) pp. 343, 344, 

 pi. viii. figs. 27-29, 32. Of this latter, however, we do not yet 

 know the muscle-spot. 



Darwinula (or Cyprione ?) globosa "occurs in great numbers, and 

 in many lamina?, in the greyish calcareous shale or marl at Links- 

 field ; and Estheria minuta, var. Broclieana, sometimes appears in 

 the same bed," Monogr. Eoss. Esth. p. 127. 



2*. Darwinula. globosa. (Duff), var. stricta, nov. (PI. IX. 

 fig. 5.) 



Length. Height. 



Eig. 5. . . . *9 mm. *35 mm. 



In company with the usual form in the Linksfield shale another, 

 but rare, form, with more truly parallel and nearly straight dorsal 

 and ventral margin, is found. 



It has a less arched back and more equal ends than the common 

 specimens, and may be regarded as a variety, possibly of sexual 

 relationship. 



3. Cttheridea ellipsoldea (Jones). (PI. IX. figs. 6 a, 6 b, 6 c.) 



Cytkere, sp. nov., Jones MS., Salter & Woodward, Descript. Catal. 

 Chart Foss. Crustac. 1865, p. 21, fig. 88. 



Bairdia ? ellipsoidea (G. S. Brady MS.), Jones, Quart. Journ. Geol. 

 Soc. vol. xxviii. (1872) p. 146. 



Bairdia liassica (not Brodie's sp.), Blake, ' Yorkshire Lias,' 1876, 

 p. 430, pi. xvii. figs. 1, 1 a. 





Length. 



Height. 



Thickness of carapace, 



Eig. 6 a 



.. -65 



•45 



— mm. 



Fig. 6 6 



.. -65 



•4 



— mm. 



Eig. 6 c 



.. -65 



— 



•35 mm. 



Carapace almost obovate, but more highly arched at the anterior 

 third of the dorsal region, where the hinge is most pronounced, 

 making the carapace broader (higher) there than behind. The 



1 Ann. Mag. Nat. Hist. ser. 4, vol. vi. (1870) pi. vii. fig. 7 ; Monogr. Post-Tert. 

 Entom., Pal. Soc. 1874, pi. ii. fig. 17 ; and Quart. Journ. Geol. Soc. vol. xli. 

 (1885) p. 347, note. 



2 The shales of Linksfield, and their fossil Eutomostraca, are treated of in 

 the Monogr. Foss. Estherise, Palaeont. Soc. 1862, pp. 74-78; but a fuller 

 aceoui.t both of the bibliographic history of this interesting section, and of its 

 geological and palseontological characters, is given in detail by Prof. J.W. Judd, 

 F.R.S., in Quart. Journ. Geol. Soc. vol. xxix. (1873) pp. 145-149. 



