6 E. ETHEEIEGE, JW., ON EOWEE-CAEBONIFEEOTJS INVEETEBEATA. 



little work, 'The Age of the Earth'*, in which he devoted a por- 

 tion of plate ii. to the illustration of some Lower- Carboniferous 

 fossils from the "Water of Leith. The name Axinus pentlandicus 

 was adopted by Dr. Ehind for what I take to be two specifically 

 distinct shells : one of these, fig. 6, was afterwards described and 

 figured, without reference to Ehiud's book, by Captain T. Brown, as 

 Pachyodon pyramidatus, in a paper " On some new Species of the 

 genus Pachyodon" f ; the other, fig. a, is probably Brown's Pachy- 

 odon nucleus of the same paper. Brown's shells were found in 

 " coal shale at Woodhall, on the north side of the Pentland Hills." 

 It is almost unnecessary for me to observe that there is no coal shale 

 at Woodhall. Pig. g of Dr. Ehind's plate is that of a Modiola, 

 afterwards described by Capt. Brown as Avicida modioliforme in his 

 4 Fossil Conchology,' where he also redescribed the two previous shells 

 (Pachyodon pyramidatus and P. nucleus), but referred them to Unio J. 

 In the previously quoted paper by the Eev. T. Brown, on the Carbo- 

 niferous rocks of the Fifeshire coast, Mr. Salter gave a figure of a 

 new species of Schizodus found by Mr. Brown to be plentifully dis- 

 tributed throughout the Pifeshire lower series. The late Dr. Plemiug 

 obtained the same shell at Colinton, water of Leith, and would 

 have referred it to Anatina attenuata, M'Coy ; but Mr. Salter, on 

 examining the hinge, pronounced it a Schizodus §. I have since 

 described this shell as S. Salteri ||, in memory of my late friend ; and 

 when so doing I pointed out that it was probably identical with 

 Pachyodon pyramidatus, Brown, and Axinus pentlandicus (fig. b), 

 Ehind ; but as both these authors appear to have figured imperfect 

 examples of these shells, the matter must remain in a state of uncer- 

 tainty, until an appeal can be made to their original specimens. Four 

 species of bivalves are recorded in the Survey Memoir by Mr. Salter — 

 the Avicula modioliforme, Brown, a thin-shelled species of Anthraco- 

 mya ? from the Wardie Shales, the Anthracosia ? ( Unio) nuciformis 

 from the Burdiehouse Limestone, and an oval species of Myalina from 

 the Clubbidean basement-beds of the Cement-stone group %. In a 

 short paper of my own, published in 1875, I described the shell I 

 have here mentioned under the name of Schizodus Salteri** '. I was 

 supplied by my friend Dr. Traquair with some good interiors ; and 

 by means of these, in conjunction with the original specimens kindly 

 lent me by the Eev. Mr. Brown, the hinge -structure of the species 

 was satisfactorily worked out. Dr. Traquair, at the same time, lent 

 me specimens of the Modiola figured by Dr. Ehind, from which I 

 was able to show its identity with Myalina crassa, Fleming. In a 

 paper I communicated to the 'Annals and Magazine of Natural 



* 12mo, 1838. 



t Ann. & Mag. Nat. Hist. 1843, xii. p. 390, pi. 16*. 



t Illustrations of the Foss. Conch. Gt. Brit. 1849, pp. 162, 178, 179, pis. 66* 

 and 73. 



§ Trans. E. Soc. Edinb. xxii, p. 392. 



|| Ann. & Mag. Nat. Hist. 1875, xv. p. 431, 



% Memoir 32, p. 146. 



#* Annals, loc.cit, 



