408 Prof. T. R. Jones on the 



behind, and sloping forward into the sulcus ; the front part is 

 not so much swollen and slopes down to the anterior margin. 



This form is near to E. dimidiata, Barrande (Syst. Sil. 

 Boh. vol. i. Suppl. p. 513, pi. xxiv. figs. 7, 8, 9), but it is 

 longer, more oblong, and not so convex. E. pelagica, Barr. 

 {ibid. figs. 1-6), is a near ally, but it is too convex and has 

 a tubercle. Among other allies are E. tuberosa, Jones, and 

 E. dejyressa, Salter (Ann. & j\Iag. Nat. Hist. ser. 5, vol. xiv. 

 pp. 391 and 394, pi. xv. figs. 1, 5, 6, 7, and figs. 2-3), but 

 the relative convexities, conditions of sulcus, and other fea- 

 tures distinguish them. E. reniformis (Kolmodin) and E. 

 Angelini, Jones (o/j. cit.), are far too round and globose, and 

 the sulcus difi'ers also. 



I may here remark that Entomis Marstoniana {op. cit. 

 fig. 8) is possibly the same as Kolmodin's E. reniformis (CEfv. 

 K. Vet.-Akad. Forhandl. vol. xxxvi. 1880, p. 135, pi. xix. 



Some six or eight specimens of E. Lindstroemi were found 

 in the uppermost limestone of Linde klint (cliff or hill) and 

 Sandarfve kulle (top or hillock). Length nearly 4 raillim. 



2. Entomis iiicequalis, Jones. 

 (PL XXII. figs. 20 a, 20 b, 20 c.) 



Primitia ineequalis, Jones, Silur. Ostrac. Gothland, 1887, p. 5. 



This is a peculiar and relatively large valve, having a Pri- 

 mitian character in its reticulate ornament and being Ento- 

 midian in its sulcation. This last feature is very strongly 

 marked, and indeed, 1 think, exaggerated by pressure, making 

 the two moieties of the valve very unequal in both size and 

 convexity. One is much more swollen than the other and 

 overhangs the ventral and part of the antero-ventral margin ; 

 this larger moiety extending forwards below, and thus lessen- 

 ing the area of the front moiety. 



The sulcus reaches the ventral margin, as in Entomidella 

 ■ and Bolbozoe*^ but its extent and peculiar sigmoidal curve 

 are most probably partly due to pressure. The hinge-line of 

 the valve is straight within (that is, below the dorsal exten- 

 sions of the two moieties of the valve) ; the front margin has 

 a strong dorsal angle, is boldly curved below it, and edged 

 with a raised rim and minute denticles. The postero-dorsal 

 angle has been broken away. 



The specimen is unique, among those sent from Stockholm 

 in 1886, and, like most of these, was from Frojel. 



* See Ann. & Mag. Nat. Hist. December 1884, pp. 400 and 401. 



