On the Palceozoic Bivalved Entomostraca. 267 



snout than the extremity of the caudal. Anal, in the male, 

 in the anterior third of the total length, half as long as head 

 and body without caudal fin. Twelve or thirteen scales on 

 the median line between the interorbital space and the first 

 dorsal raj. Caudal fin as long as the head. Pale brown, 

 the scales edged with darker ; six to eight vertical black lines 

 on each side of the tail. 



JVIale 25 millim. long, female 42. 



Numerous specimens, from Rio Grande do Sul. 



XXXIV. — Notes on the Palaeozoic Bivalved Entomostraca. — 

 No. XXVI II.* On some Scandinavian Species. By Prof. 

 T. Rupert Jones, F.R.8., F.G.S., &c. 



[Plate XV.t] 



Several fossil Cypridiform Ostracods, such as Macrocypris^ 

 Po7itocypris, and Bythocypris^ from the Upper-Silurian strata 

 of Shropshire, were described and figured in the Ann.& Mag. 

 Nat. Hist. ser. 5, vol. xix. (1887), pp. 178-189, plates iv.- 

 vii. ; and a few species similar to some of the above-men- 

 tioned, and of like age, but from Scandinavia, were treated of 

 oj). cit. ser. 6, vol. i. (1888), pp. 396-398, pi. xxii. figs. 1-3. 

 Since then my friend Prof. Gustav Lindstrom, of Stock- 

 holm, has sent lu me for examination a series of Ostracoda \ 

 from a red clay near Wisby, which is referred to in the 

 column marked " a " in Prof. G. Lindstrom's Table of 

 Formations, at p. 8 of my ' Notes on some Silurian Ostracoda 

 from Gothland,' 8vo, Stockholm, 1887, and is there termed 

 the " Oldest red shale beds with Arachnophyllum^'' at the 

 base of the Stricklandinia-xazxX's,. They are regarded as 

 being on the horizon of the Llandovery formation in England^ 

 homotaxially a little below the Upper Llandovery §. 



* No. XXVII. appeared in the Ann. & Mag. Xat. Hist, for Mav 1889, 

 pp. .373 &c. 



t This Plate has been drawn with the aid of a grant from the 

 Royal Society for the illastration of the f jssil Ostracoda. 



\ Mr. C. Davies Sherborn, F.G.S., has helped me in sorting and 

 comparing these little specimens. 



§ The provisional list of these Wisby species, given at p. 410, Ann. & 

 Mag. Nat. Hist. June 1888, is now modified as follows : — 



Beyrichia Elendeni (with hypertrophied front lobe). 

 AjMrchites, three species. 

 Macrocypris, one species. 

 Pontocypris Mmoii, three varieties. 

 Bythocypris, six species and varieties. 



Lately Professor G. Lindstrom has forwarded for my examination some 



