396 Prof. T. R. Jones on the 



other respects, Ang-elin's figure, Kolmodin's Elpe reniformis, 

 and Barrande's El2)e pinguis are certainly related to the genus 

 {Entomis) under notice, and the largest Entomis tuherosa and 

 some large Entomids now to be described remove any diffi- 

 culty in associating them together. 



6. Entomis veniformis (Kolmodin) . 

 (PI. XV. fig. 22.) 



Elpe reniformis, Kolmodin, " Ostracoda Siluriea Gotlandise," CEfv. K, 

 Vet.-Ak. Forh. vol. xxxvi. 1880, p. 135, pi. xix. fig. 2 a-c. 



Some remarks have been already made, in the notice of 

 fig. 14, on Kolmodin's species here mentioned. Since that 

 was written, Henry Johnson, Esq., of Dudley, has kindly 

 lent me some well-preserved but somewhat depressed speci- 

 mens of what appears to be this species, from the Lower- 

 Ludlow Shale of Sedgley, not far from Dudley. The test 

 is brownish and smooth. The valves are nearly semicircular, 

 j% inch long and fV l^^gli j tl^^ii' original nearly uniform 

 convexity has been interfered with by pressure, and the 

 surfaces are in consequence irregularly undulate. The 

 slightly curved dorsal sulcus is quite distinct, and an obscure 

 tuberculation or other irregularity of surface is traceable at its- 

 umbilical end. This reminds us of what we see of the 

 umbilical features in Entomis Haswelliana (p. 394) as internal 

 casts, which may have had equally smooth valves, with but 

 slight indications of the internal markings. The dorsal 

 furrow reaches to the middle of the valve, and the two moieties 

 of the surface are of equal convexity. I regard as the ante- 

 rior the part within the curve of the furrow ; Dr. Kolmodin 

 has referred to that part as the " posterior." 



7. Entomis glohuhsa, Jones. (PI. XV. figs. 11 a-e, 12.) 



I. In the ' Monograph of the Silurian Fossils of the Girvan 

 District in Ayrshire,' by H. A. Nicholson and R. Etheridge, 

 Jun. (vol. i. 2nd fasciculus, 1880, p. 223), a little subcorneal 

 fossil was described and figured (pi. xv. fig. 12, a, h) as a 

 peculiar form of Entomis, originally very globose, but subse- 

 quently squeezed in such a manner that the dorsal sulcus was 

 made to lie in the greater axis of the fossil instead of across 

 the long axis of the original valve. Thus — " the subconical or 

 nearly hemispherical fossil, with a somewhat oval base-line 

 ("» by tV inch) , here figured, is an internal cast (in mudstone) 

 of a tent- like shell, carapace, or valve, of doubtful relationship. 

 1 believe it to be an Entomostracan valve. It is referred to 

 in tlie Mem, Geol. Surv. Scotland (Explan. Sheet 3, Western 



