322 
Prof. T. R. Jones on the 
millim.) and coarser ridges, however, are strong distinctions. 
It has been much modified, the ridges having been squeezed 
up into sharp edges ; and at the same time the upper margin 
seems to have been flattened and broken and the sulcus nearly 
obliterated. At one time I thought that it might match 
Richter’s E. Sandbergeri , taking into account his bad 
drawings ; but I cannot now reconcile the two forms, how- 
ever much they may have been modified by pressure, particu- 
larly as the ridges are spiral in Richter’s fig. 17, pi. xx., 
Zeitschr. deutsch. geol. Gres. 1869, and they are simply 
longitudinal and somewhat convergent at the ends in PL XI. 
fig. 3. As it is larger and more roundly oval (proportionally 
higher) than E . serratostriata, with fifteen instead of about 
thirty ridges, and therefore belonging to the thick-wrinkled 
group, I separate this form as Entomis Richteri , after my 
deceased friend Dr. Reinhard Richter, who interested himself 
for many years in the discovery and elucidation of many forms 
of the Devonian Entomides in the neighbourhood of Saalfeld. 
This specimen, from Whiteway Farm, is unique. 
3. Entomis gyrata (Richter). (PI. XI. fig. 4.) 
Cytherina, Kichter, Beitrag Palaont. Thiir. Waldes, 1848, p. 46, pi. vi. 
fig. 212. 
Cypridina gyrata , Kichter, Denkschr. Akad. Wissensch. Wien, vol. xi. 
1856, p. 122, pi. ii. figs. 33, 34 ; and Zeitschr. deutsch. geol. Gesell. 
vol. xxi. 1869, p. 769, pi. xx. figs. 13. 14 (bad figures). 
Richteria ( Entomis ) gyrata , Bigsby, Thesaur. Dev.-Carbonif. 1878, 
p. 27. 
Entomis gyrata , Jones, Ann. & Mag. Nat. Hist. ser. 5, vol. iv. 1879, 
pp. 185-187, pi. xi. figs. 4, 8, 10-12, and 18 (From Dr. Kichter’s 
typical specimens.) 
Entomis gyrata , Jones, Ann. & Mag. Nat. Hist. ser. 5, vol. xii. 1883, 
p. 245, pi. vi. figs. 3 a, 3 b. (Uralian . ) 
We know from G. West’s careful figures (above referred 
to) of Dr. Richter’s own specimens what E . gyrata really is, 
with its curious subconcentric wrinkling, which reminds us 
(as Richter has noticed) of the delicate markings of our 
finger-tops. The specimen before me, from Castle-dyke 
Quarry, Devon, has its wrinkles, ridges, or costulse wide 
apart and squeezed into sharp edges, and therein it differs 
from the type ; but the pattern appears to be essentially the 
same. When perfect the valve was about 1 millim. long by 
07 millim. high, which is rather smaller than the German and 
Uralian specimens. Rather than propose a new specific 
standing for this unique specimen I place it with E. gyrata , 
on account of the plan of the ornament, though badly pre- 
served. It may possibly be a variety of that species. 
