﻿278 MB. F. E. C. REED ON THE FAUNA OF [May I9IO, 



(Pander) with rather coarser ribs than usual. 0. obtusa occurs in 

 the Orthoceras Limestone and in the Cystidean Limestone. As 

 C. Gagel * mentions, three to five of the median ribs on the pedicle- 

 valve are often stronger than the others. 



Orthis parva (Pander). 



This species 2 is fairly common in the limestone (97) and (155). 

 In the list of the fossils from the Tourmakeady Beds it was erro- 

 neously entered as 0. elegantula, but the better material now 

 available allows the correction to be made, as the beds in the two 

 places are identical. 0. parva is a common species in Stage B in 

 the Baltic Provinces of Russia. 



Camerella cf. cuneatella, Davidson. 



A small and abundant brachiopod from the limestone (97), 

 measuring from 6 to 7 millimetres in length, may be compared 

 with the Scottish species described by Thomas Davidson 3 as 

 Rhynchonella cuneatella, from the Balclatchie (Llandeilo) con- 

 glomerate of Ayrshire. The triangular shape is the same, but the 

 marginal folds, eight or nine in number, are more numerous, 

 and the beak is not preserved. A fine longitudinal striation also 

 appears to be present. The Scandinavian and Russian species 

 * Rhynchonella ' digitata 4 (M. v. Leuchtb.), from the expansvs 

 beds, may be more closely allied to our form, which is also scarcely 

 distinguishable from some specimens of Camarella thomsoni, Dav., 

 but probably it is a new species. None of the specimens, un- 

 fortunately, are Avell preserved. 



EXPLANATION OF PLATES XX-XXII. 



Plate XX. 



Map of the igueous and associated sedimentary rocks of the Glensaul district, 

 Co. Galway, on the scale of 6 inches to the mile. 



Plate XXI. 



[All the specimens figured in this plate are from locality 62.] 



Fig. 1 a. Bathyurellus glensaulensis, sp. nov. Anterior portion of head-shield. 

 X*2. 



1 b. Do. Side view of the same specimen. X 2. 



2 a. Do. Middle shield, nearly perfect. X 2. 



2 b. Do. Side view of the same specimen, x 2. 



3 a. Do. Free cheek. X 2. 



3 b. Do. Eye of the same specimen. X 6. 



4«. Bathyurus aff. new, Billings. Middle shield. X 3. 



4 b. Do. Side view of the same specimen, x 3. 



5. Bathyurus cf. Union, Billings. Pygidium. x 2. 



v 'Brachiop. Cambr. Silur. Geschiebe,' Beitr. Naturk. Preuss., Phys.-GCk. 

 Gesellsch. Konigsberg, 1890, p. 33 & pi. ii, fig. 23. 



2 • Beitr. Geogn. Euss. Reich.' St. Petersburg, 1830, p. 83 & pi. xxvi, fig. 10. 



3 ' Monogr. Brit. Foss. Brach.' vol. v (Pateont. Soc. 1882-84) p. 200 & pi. x, 

 fig. 11. 



4 W. C. Brogger, 'Die Silurischen Etagen 2 & 3 ' Christiania, 1882, p. 52 & 

 pi. xi, figs. 2a-2c. 



