118 R. Etheridge, jun. — PalcBontological Notes. 



pea, and very closely resembles in form and general characters the 

 Silurian Orthis hiloba. We have only one valve, the ventral (?), 

 which is markedly bilobed, with numerous close fine longitudinal 

 ribs. The specimen was forwarded to Mr. T. Davidson, F.E.S., 

 who, on returning it, said, "In outward shape, as you justly I'emark, 

 it much resembles OrtMs hiloba from the Silurian rocks, but you 



say your specimen is Carboniferous Unfortunately the 



hinge-line, or part close to the hinge, in the interior, is not well 

 preserved, so that it is difficult to determine whether it is an OrtMs 



or a RhyncJionella If it were Silurian, I should almost take 



it to be OrtMs biloha." It will perhaps be best to catalogue it as 

 BJiynchonella f sp., until the discovery of further specimens shall 

 enable us to arrive at a more definite conclusion. 



Loc. and Horizon. — Skateraw, near Dunbar, in Lower Carbon- 

 iferous Limestone shale. 



Collector, Mr. J. Bennie. 



3. Pentremitks, sp. — So far as I am aware, this genus has not 

 been recorded from the Scotch Carboniferous series. We have in 

 the collection of the Scotch Survey a portion of a minute ambu- 

 lacrum, washed amongst other small things from a sample of shale 

 by Mr. Bennie. The form of the ambulacrum when perfect would 

 be lanceolate, with a minute flexuous ambulacral groove. The 

 latter is crenulate on the sides, giving off short alternate lateral 

 grooves which communicate with sockets. From the slits or holes 

 in the lateral margins of the ambulacrum run in other grooves, 

 vidiich lead to larger sockets than those terminating the branch 

 ambulacral grooves, and set alternately with the latter. The under- 

 surface of the ambulacrum is flattened. These features are so like 

 those described by the late Mr. Billings in the ambulacra of 

 Pentremites pyriformis (Canadian Pal. Foss. vol. ii. pt. i. p. 114), 

 that I think it very probable the small ambulacrum in question is 

 that of a Pentremite. It is quite different from that of Astrocrinites 

 Bevniei (mihi). 



Loc. and Horizon. — Carlops Quarry, Peebleshire, shale over the 

 Carlops Limestone, Lower Carboniferous Limestone Group. 

 Collector, Mr, J. Bennie. 



4. Spirokbis spinosa, de Koninck (Descrip. Anim. Foss. Terr. 

 Carb. Belgique, p. 58, t. Gr. f. 8, a-c). — This species occurs in the 

 Scotch Carboniferous system sparingly. I recognized a few ex- 

 amples in some washings obtained at Gair, Lanarkshire, a few 

 years ago by Mr. Bennie, from shale above the G-air Limestone (Up. 

 Carb. Limestone Group), and have since seen it from one or two 

 other localities. 



5. Chonetes polita, M'Coy. — Both M'Coy (Brit. Pal. Foss. p. 457, 

 t. 3d, f. 30) and Davidson (Mon. Brit. Carb. Brachiopoda, p. 190, 

 t. 47, f. 8-11) describe and figure this species as possessing a smooth 

 shell. I find, however, that many examples from localities in the 

 neighbourhood of Edinburgh show that the shell was marked longi- 

 tudinall}'^ with faint, semi-effaced, flattened ribs or strise, usually 

 much more marked towards the front ma,rgin. 



