Palceozoic Bivalved Entomostraca. 321 



Entomis sei-ratostriata (Sandberger), Jones, Ann. & Mag. Nat. Hist. 



ser. 4, vol. xi. 1873, p. 414. 

 Entomis globulus (Richter), Jones, ibid. p. 415. 

 Richteria serratostriata, Jones, Neues Jahrb. f. Min. &c., 1874, p. 180 



(see Ann. & Mag. Nat. Hist. September 1879, p. 183). 

 Cypridina {Entomis) serratostriata, Bigsby, Thesaur. Dev.-Carbonif. 



1878, p. 27. 



Ttichteria {Entomis) serratostriata, Bigsby, ibid. p. 28. 



Entomis serratostiiata, Jones, Ann. & Mag. Nat. Hist. ser. 5, vol. iv. 



1879, pp. 182-187, pi. xi. figs. 1, 3, 5, 7, 13-17. 



Entomis serratostriata, Jones, ibid. ser. 5, vol. xii. 1883, p. 245, pi. vi. 

 figs. 4 and 5. 



Owing to the usually bad state of preservation in which 

 these little Ostracodous valves and carapaces occur, both 

 from loss of the test and the pressure they have suffered in 

 various directions, they rarely present perfect conditions for 

 description and figuring (see pi. xi., Ann. & Mag. Nat. Hist. 

 September 1879, for various examples). The English speci- 

 mens, now figured, form no exception, but are variously 

 modified, with the nuchal sulcus misplaced in figs. 1 and 2, 

 and nearly or quite extinguished in figs. 3 and 4 of other 

 species. Other specimens have indications of the sulcus in 

 its proper mid-dorsal position ; and in size these English 

 examples correspond with the German *. The best preserved 

 as to outline have the normal oval shape and the delicate, 

 raised, longitudinal striae, which usually appear to be pitted, 

 but are sometimes pimpled, along the underside, as seen also 

 in pi. xi. (1879), figs. 1 J, 5 5, and 7 h ; the pits or pimples 

 having different interstices, according to age and state of 

 preservation. The raised lines converge at the ends of the 

 valves, as in pi. xi. (1879), figs. 1 a, 5 a, and 7 a. On these 

 lines, in hollow impressions of the valves, pits (PI. XI. 

 figs. 2 a, 2h) occur, and these have evidently been left by 

 little prickles once existing on the valves ; and in raised 

 casts (of the convex valves) there are minute tubercles or 

 pimples (PI. XI. figs. 2 a, 2 5), instead of small pits, and 

 evidently the bases of broken prickles, small setee, or bristles, 

 once fringing the thin longitudinal ridges. 



2. Entomis Bichteri^ sp. nov. (PI. XI. fig. 3.) 



Entomis Sandhergeri (Ricbter), Jones, in Quart. Journ. Geol. Soc. 

 vol. xlvi. 1890, p. 514. 



This at first sight looks like an exaggerated form belonging 

 to the species last described. Its much larger size (2 x 1*4 



* Tbese latter were figured in pi xi., 1879, vrith an amplification of 18 

 diameters; the former are X 30 diam. in PI. XI. 



