Notes on a Feio Sihinan Fossils from Ayrshire. 169 



moUuscan affinity, I shall be perfectly willing to abandon 

 the view here advanced, which, however, I am convinced, is 

 at present the more satisfactory of the two. The body repre- 

 sented in Fig. 3 may possibly be a small Theca which occurs 

 in the same beds. 



Pinnocaris La'pioortlii, sp. nov., Figs. 3-5. 



aS^?. Chars. — Identical with those of the genus ; the greatest 

 breadth is at a little less than the middle of the valve ; con- 

 centric lines fine and close. 



Ohs. — I have much pleasure in naming this species after 

 Mr C. Lapworth, F.G.S., who, I am informed, on looking 

 through Mrs Gray's cabinet, also regarded it as a crustacean. 

 I am also indebted to Professor T. C. Archer, Director, Edinb. 

 Mus. Science and Art, for the loan of a well-preserved 

 Girvan specimen, from the "Hugh Miller Collection," deposited 

 in that institution. 



Log. and Horizon. — Balcletchie, south-east of Girvan, in 

 rocks of Silurian age ; exact horizon not yet determined. 



- ORDER TRILOBITA. 

 Genus LiCHAS~i?a^m^^, 1826. 

 Lichas sp. 



(Compare L. avus, Barrande, Syst. Sil. Boh^me, i., Supp,, 

 p. 40. Atlas, pis. 5, 6, and 10.) 



Ohs. — There is a portion of the head of a large Lichas (the 

 glabella and fixed cheeks), which Mrs Gray refers to the 

 above species. It is larger than most of the British species 

 of the genus, with the exception of Z. ohscuriis, Portlock ; * 

 L. Hibernicus, Portlock ; f and L. imtriarchus, Edgell. J The 

 ornamentation closely resembles that of L. avus, but the form 

 of the glabella is somewhat different. 



Log. and Horizon. — Craighead, near Girvan ; Lower Llan- 

 dovery, according to the map of the Geological Survey of 

 Scotland (sheet 14, 1 inch Scotland). 



* Geol. Report, Londonderry, p. 274, t. 24, f. 4. 



t Ihicl, p. 274, t. 4, f. 1. 



X Geol. Mag., iii., p. 162, f. 1-6. 



