ENTOMIS. 51 



III. i^aTO%.— BNTOMIDID^, Jones. 

 1. Genus. — Entomis, Jones, 1873. 



Defined chiefly by its striking dorsal furrow, this genus appears to extend from 

 the Cambrian to the Coal-measures. It is well represented in the German 

 Devonians by Entomis serrato-striata (Sandb.)/ which, with other similar forms, 

 gave its name to the Cypridinen-ScMefer. The same species is stated to have 

 been found by Fr. Adolph Romer in Devonshire, in a series of red schists and 

 limestones near Bickerton, at the south-eastern foot of Ramshorn Down (' Neues 

 Jahrb. f. Min.,' &c., 1853, p. 812.) More recently, in 1888, it was rediscovered 

 in red shale near Ugbrooke Park by my friend, Herr Tschernyschew, when on a 

 visit to Devonshire at the time of the International Consress.* 



1. Entomis peregrina, Whidborne. Plate IV, figs. 14 a, b, c, d (right valve); 15 



ft, b, c (left valve). 

 1889. Entomis pebegeina, Whidh. Geol. Mag., dec. 3, vol. vi, p. 29. 



Description. — Valves oval, convex, divided into two unequal portions by a 

 deep furrow rising from the narrow, flattened, median portion of the dorsal 

 margin, and running obliquely forwards, with a backward curve. Contour, before 

 this sulcus, evenly convex ; and behind it the convexity merging into the narrow, 

 flattened, dorsal area, and extending to, and losing itself at, the posterior end, 

 while rising centrally to an elevated, rounded knob, having its apex near the 

 middle of the furrow ; this posterior portion being thus much more elevated than 

 the anterior part. Edges of valve nearly straight dorsally, boldly arched ventrally, 

 and unequally rounded at the ends. 



Size. — One of the valves measures 5'5 mm. in length, the other 4'5 mm. in 

 length. Inadvertently the latter has been figured on a somewhat smaller scale 

 than the other. 



Locality. — Lummaton. I only know of two specimens. An example of the 

 left valve (fig. 15) was found by Mr. T. Roberts, F.G.S., last spring, and is now 

 in the Woodwardian Museum, and a slightly larger example of the right valve 

 (fig. 14) was found shortly afterwards by myself. 



Remarks. — This little Entomis seems to be very distinct. It diS'ers in several 

 particulars from E. ttiberosa, Jones, of which E. pelagica, Barr., is in all pro- 

 bability only a synonym, as was intimated by Prof. Rupert Jones in the ' Annals 

 Mag. Nat. Hist.,' December, 1884, p. 391. That species is more elongate, its 

 knob or nodule is smaller and more defined, its groove larger and more vertical, 



^ 1857, ' Quart. Journ. Geol. Soc.,' vol. xiii, p. 89. 



2 1889, Kayser, ' Neues Jahrbuch f. Min.,' Band i, part 2, p. 189. 



