Fossil Cjpridinidje and some Allied Ostracoda. 339 



2. Another specimen, also of Lower Silurian age, is 

 C. Groyce^ J., Quart. Journ, Geol. Soc. vol, xlix. (1893) 

 pp. 305, 306, pi. xiv. fig. 12. This is from the grey shales 

 of Whiteliouse Bay, near Girvan, Ayrshire. It measures 

 1"08 by "76 millim. In shape it nearly resembles the Carbon- 

 iferous C. Youngtana, Jones and Kirkby. (PI. XVII. 

 %. 17.) 



3. Among his Silurian fossils from the River Ssrednjaja, 

 in the Kew-Siberian Island of Kotelny, Baron Eduard voa 

 Toll has found a specimen which he has described and figured 

 as ^' Leperditia (?) sp.," but which may possibly belong to the 

 Cypridinids. 



In the ' Memoires Acad. Imper. Science St.-Petersbourg,' 

 &€v. 7, vol. xxxvii. no. 2, 1889, p. 45, pi. iii. fig. 20, this 

 doubtful little fossil appears to be a not well-preserved cast 

 of a left valve that has a truncated front margin with a 

 shallow notch. Some delicate wavy strise, passing obliquely 

 backwards and downwards, mark the anterior moiety of this 

 fossil as far as the relatively large oval subcentral muscle- 

 spot. The notch, though weak, and the muscle-spot suggest 

 an alliance with Cypridina. The valve is 7 millim. long. 

 (PI. XYII. fig. 14.) 



4. An Upper- Silurian form closely related to Cypridina is 

 the Cyprosis Hasicellii, J., Geol. Mag. dec. ii. vol. viii. (1881) 

 p. 33b, pi. ix. figs, ^a, 6 b. It measures 10 by 7 millim. 



The late Mr. G. C. Haswell found it in the Upper Silurian 

 mudstones on the west side of the North-Esk Reservoir, in 

 the Pentland Hills, Scotland. 



The strong broad vertical sulcus crossing the hinder third 

 of the valve is its distinguishing characteristic. (PI. XVII. 

 fig. 9.) 



This has been referred by M. Barrande * to Bolbozoe, but 

 it does not belong to that genus. 



5. A bizarre form lately figured by G. Giirich, from the 

 Cardiola-mterrupta zone (Upper Silurian) in Poland, probably 

 comes within the Cypridinid group. It is of a suboblong 

 foim, notched and hooded apparently in front, and impressed 

 with two deep, transverse, curved sulci, giving the surface 

 the appearance of being raised into three unequal lobes. An 

 oval muscle-spot, with twelve radiate marks on each side, is 

 visible near the middle of the valve. The notch and muscle- 



* Svst. Silur. Bolieme, part i. vol. i. Suppleiu. (1872) p. 501. 



