R. Ether idge, j'un. — Notes on the Gilbertson Collection. 165 



47. Modiola lingualis, Phillips sp. (p. 209, t. 5, f. 21). 



The type of this species is not preserved in the Gilbertson Collection, hut there 

 are specimens of the shell to which I gave the name of Modiola lithodomoides, which 

 may be only the full-grown condition of M. lingualis. 



48. Modiola squamifera, Phillips sp. (p. 209, t. 5, f. 22) . 



An exceedingly well-marked shell, distinguished by its broad flat lamellae ; the 

 posterior wing is small, although it is not entirely preserved, and the dorsal margin 

 in Phillips's figure is too decidedly marked. This species helongs to a peculiar group 

 of Carboniferous Mytiliform shells of the hinge character of which we at present 

 know little. By Prof, de Koninck it has been identified ' with a Belgian shell, 

 which he places in the genus Cypricardia ; but judging from the respective figures, I 

 should be inclined to pause before uniting the two. 



49. Modiola granidosa, Phillips sp. (p. 210, t. 5, f. 23). 

 Not in the Gilbertson Collection. 



50. Modiola elongata, Phillips sp. (p. 210, t. 5, f. 24). 



If the figure is a correct representation of the original, the specimen is not in the 

 Collection. 



51. Cypricardia glabrata, Phillips sp. (p. 209, t. 5, f. 25). 

 Not in the Gilhertson Collection. 



52. Pleurorhynchus Hibernicus, J. Sowerby (Phillips, p. 210, t. 5, 

 f. 26). 



Phillips's type of this species is not in the Gilhertson Collection. 



53. Pleurorhynchus minax, Phillips (p. 210, t. 5, f. 27). 



Phillips remarks that the lower figure of Sowerby's Cardium aliforme 2 is pro- 

 bably his species, and this view has been adopted by Prof. Morris. 3 On the other 

 hand, Professors de Koninck 4 and M'Coy 5 wholly unite P. aliforme and P. minax. 

 After a very careful and lengthened comparison of the types of both Sowerby and 

 Phillips, I have to express my complete adherence to the views of these authors so 

 far, leaving out of the question, for the present, the question of the Devonian 

 _P. minax. 6 Extreme care should be taken in describing the surface characters in 

 this group of shells, for I find that the shelly matter was of considerable thickness, 

 and the various layers each possessed its own style of ornament. This has been 

 noticed to a certain extent by Prof. M'Coy; 7 when perfect, Conocardium {Pleuro- 

 rhynchus) aliforme has the valleys between the radiating ribs crowded with close 

 undulating laminae resembling those seen on the surface of Spiriferina laminosa. 



54. Pleurorhynchus elongatus, J. Sowerby (Phillips, p. 211, t. 5, 

 f. 28). 



An exceedingly well-marked and distinct form ; it has been shown by Prof, de 

 Koninck, who is followed by M'Coy, to be only a synonym of Conocardium rostratum, 

 Martin. 8 I have compared Sowerby's figured specimen, which was given to him by 

 Mr. Martin, with Phillips's shell, and find them to agree. 



55. Pleurorhynchus armatus, Phillips sp. (p. 211, t. 5, f. 29). 



This specimen is not in the Gilbertson Collection, but I have little doubt that 

 Prof, de Koninck is correct in referring 9 it to Conocardium (PI.) aliforme, Sow. 



56. Pleurorhynchus trigonalis, Phillips sp. (p. 211, t. 5, f. 30-32). 

 I have examined in detail the only specimen of this species in the Gilbertson 



Collection, and which represents figs. 30 and 32 of the above plate, but somewhat 

 on an enlarged scale. Prof, de Koninck has referred 10 this species to C. Ribernicum, 

 Sowerby ; in this I agree with him, as I believe it to be only the young form of the 

 latter. 



57. Unknown genus, Phillips (t. 5, f. 33). 

 Not in the Gilbertson Collection. 



1 Zoc. cit. p. 92, t. 3, f. 11. 2 Min.-Con. t. 552. 



3 Catalogue, 2nd ed. p. 195. i Loc. cit. p. 83. 



5 Brit. Pal. Foss. p. 516. 6 Pal. Foss. Cornwall and Devon. 



7 Loc. cit. p. 517. 8 Arcites, Pet. Derb. t. 44, f. 6. 



9 Loc. cit. p. 83. 10 Ibid, p. 85. 



