182 BRITISH PALEOZOIC PHYLLOCARIDA. 



species, named after Dr. John Young, F.G.S., Under-keeper of the Hunterian 

 Museum, University, Glasgow, who possesses the specimen. 



From Lower Carboniferous series. In the Upper Limestone group, at Robroy- 

 ston, 1 Lanarkshire; with black, non-calcareous shale, about 300 fathoms below 

 the Ell Coal. 



At Robroyston, about three miles north-east of Glasgow; the strata are under 

 the Upper Limestone, in the Possil Ironstone series. 



Calyptocaris, gen. nov. 



This phyllopod differs from Dithyrocaris in having had a bivalved shell capable 

 of being closed. Its costulate ornament approximates to that of D. Belli. 



1. Calyptocaris striata (H. Wood /card), 1871. Plate XVIII, fig. 7. 



Ditiiyrocaris steiatus, H. Woodward, 1871. Eeport Brit. Assoc, for 1870, 



Sections, p. 91. 



? — striata, Woodward and Etheridge, 1873. Memoir Geol. Surv. 



Scotland, Explaa. Sheet 23, Appendix, pp. 49, 57, 



100; Geol. Mag., 1874, p. 109, pi. v, fig. 6; Eeport 



Brit. Assoc, for 1873, Sections, p. 92. 



— — Armstrong and others, 1876. Catal. "W.-Scotl. Fossils, 



p. 29. 

 — Bigsly, 1878 Thesaur. Dev.-Carb., p. 249. 



Eep. Brit. Assoc, for 1886, p. 65. 

 Geol. Mag., dec. 4, vol. vi, p. 28. 

 Eep. Brit. Assoc, for 1898, p. 520. 

 Geol. Mag., dec. 4, vol. vi, p. 29. 

 Eep. Brit. Assoc, for 1898, p. 521. 



Size. — Length of valve probably 30 mm. ; breadth of valve is 15 mm. 



Specific Characters. — This imperfect bivalved test has been filled with matrix, 

 and the hinder moiety has been broken away. The remaining front part repre- 

 sents the exterior of the left valve ; the hinder moiety shows the inside of the 

 right valve as far as it reaches ; the posterior border of both valves is absent. 

 The front end of the left valve is obliquely truncate, with rounded corners ; and 

 it formed apparently one side of an open angle between the antero-dorsal regions 

 of the two valves when they were perfect and open. The surface bears eight or 

 nine longitudinal riblets ; those on the ventral region are parallel to the curved 



1 A description of this locality is given at p. 88 of the 'Catalogue Western-Scottish Fossils,' 

 1876. I), tenuistriata, at pp. 45 and 89, probably refers to this fossil specimen. 



2 KiiXvttto), 1 close or hide; and nap is, a shrimp. 



— 



— 



E., W.,and J.,lStf. 



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— 



W. W. and J., 1899. 



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— 



1899. 



Caltptocaris ST 



RIATA, 



1899. 



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— 



1899. 



