Palceozoic Bivalved Entomostraca. 321 
Entomis serratostriata (Sandberger), Jones, Ann. & Mag. Nat. Hist, 
ser. 4, vol. xi. 1873, p. 414. 
Entomis globulus (Richter), Jones, ibid . p. 415. 
Eichteria serratostriata , Jones, Neues Jahrb. f. Min. &c., 1874, p. 180 
(see Ann. & Mag. Nat. Hist. September 1879, p. 183). 
Cypridina (Entomis) serratostriata , Bigsby, Thesaur. Dey.-Carbonif. 
1878, p. 27. 
Tlichteria (Entomis) serratostriata , Bigsby, ibid. p. 28. 
Entomis serratostriata , Jones, Ann. & Mag. Nat. Hist. ser. 5, yol. 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 b, 5 b, and 7 b ; 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, 2 b) 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 b), instead of small pits, and 
evidently the bases of broken prickles, small setm, or bristles, 
once fringing the thin longitudinal ridges. 
2. Entomis Richteri, sp. nov. (PI. XI. fig. 3.) 
Entomis Sandberg eri (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 
* These latter were figured in pi xi., 1879, with an amplification of 18 
diameters; the former are X 30 diam. in PL XI. 
