Paleozoic Bivalved Entomostraca. 271 
but is fuller (more convex) on the sides, in this respect sur- 
passing even var. a (/. c. fig. 7). It may therefore be taken 
as var. d, or obesa, if a subsidiary name be requisite. 
B. symmetrica was found also in the Fréjel shale of Goth- 
land by Prof. G. Lindstrém (Ann. & Mag. Nat. Hist. ser. 6, 
vol. i. p. 397). 
4, Bythocypris phaseolus, Jones, var. elongata, nov. 
(PIX. figs: Sia, 0;,¢.) 
Proportions :—L. 15. H.7. Th. 8. 
This is longer and proportionally lower than the type, and 
has a straighter back; but its flat sides, rounded ends, in- 
curved ventral margin, and edge view, similar to that in 
figs. 116, 126, pl. vii. Ann. & Mag. Nat. Hist. ser. 5, 
vol. xix., indicate its close alliance to B. phaseolus. Wemay 
term it var. elongata. 
5. Bythocypris concinna, Jones. (Pl. XV. figs. 11a, b.) 
Proportions :—L. 15. H.8. Th. 8. 
This appears to be referable to fig. 6, pl. v. Ann. & Mag. 
Nat. Hist. ser. 5, vol. xix. pp. 186, 187. It is found also at 
four other Swedish localities (op. cit. June 1888, p. 397). 
6. Bythocypris Phillipsiana, Jones & Holl, var gotlandica, 
nov. (PEW) figs! 9a, 6} cl) 
Proportions :—L. 14. H.9. Th. 7. 
This is evidently another variety of the persistent * species 
B. Phillipsiana, but is more compressed (that is somewhat 
flatter on the sides) than either the type or any of the pub- 
lished varieties. 
IVY. APARCHITES, Jones, 1889. 
(Pl. XV. figs. 12, 13, 14.) 
These specimens have such simply lenticular and round 
carapaces that at first sight they look as if they belonged to 
Polycope, but they have too much hinge-line for that genus. 
They are more nearly allied to Primitia lenticularis, J. & H. 
(Ann. & Mag. Nat. Hist. May 1886, p. 408); but differ- 
* From Silurian to Carboniferous times. See Ann. & Mag. Nat. Hist. 
March 1887, pp. 187, 188. 
