BRITISH SILURIAN BRACHIOPODA. 165 



62. Stricklandinia lirata, /. de C. Sow. Dav., Sil. Mon., PI. XX, figs. 1 — 13; and 



Sup., PI. IX, fig. 1. 



This remarkable species having been fully described at p. 159 of my 'Silurian 

 Monograph,' all I would add is that an incomplete specimen was found by Mrs. R. 

 Gray in the Middle Llandovery at Woodland Point, Ayrshire, in company with St. lens. 

 Specimens identical with the English have been described and illustrated by Angelin and 

 Lindstrom in pi. xvii of their fine work, ' Fragmenta Silurica,' 1880. Specimens from 

 the Wenlock series of the Island of Gothland measure 4| inches in length by 4|- inches 

 in breadth. 



Internal casts of Stricklandinia lirata have been collected by Mr. W. J. Harrison in 

 the Drift at Moseley, near Birmingham. Llandovery quartzite rocks in siiil with P. 

 liratus were likewise found by the same geologist at the north-east side of the Lickey 

 Hills. 



63. Stricklandinia lens, /. de C. Soio. Dav., Sil. Mon., PI. XIX, figs. 13—23; 



Sup., PI. IX, figs. 2 to 5. 



At p. 161 of my ' Silurian Monograph ' this species has been fully described, and I 

 would here merely allude to the shell having been discovered by Mrs. R. Gray to occur 

 in great abundance, and with much variation in shape, in the Middle Llandovery at 

 Woodland's Point, Ayrshire. In some examples the hinge-line is much longer than in 

 others, and is sometimes almost straight. One specimen measured 2|- inches in length 

 by 2| inches in breadth. It is, however, very difficult to procure complete examples, 

 most of the specimens being either crushed out of shape, or otherwise imperfect. The 

 species varies also much in form, being either longitudinally oval or as broad as long. The 

 dorsal is not as deep as the ventral valve, but both are sometimes very convex ; the 

 beak of the ventral valve is in some examples so much incurved that it touches the 

 umbone of the dorsal valve, and the area, which is visible in some specimens, can hardly 

 be seen in others. In the ventral valve there exists a shallow sinus, with sometimes a 

 rounded rib on either side ; and some examples have quite the exterior shape of a 

 Spirifer. 



