R. Ether iclge, jun. — Notes on the Gilbertson Collection. 163 



point when the valve is perfect. Phillips described his shell as, "Ears without 

 radiating ribs ? " I find, however, that this doubt on Prof. Phillips's part arose from 

 the decorticated nature of the ear-surface of his specimen ; there are distinct traces 

 of radiating ridges. Sowerby, in his description, says, " smooth striae," l and Phillips, 

 " nearly smooth radiating ribs," but there can be no doubt, on a careful examination, 

 that both Sowerby's original, and the specimen referred to this species by Phillips, 

 were minutely and strongly decussated by close, concentric, frilled imbrications, now 

 in a great measure worn off. 



19. Pecten anisotus, Phillips sp. (p. 212, t. 6, f. 22). 



I have compared the type of this species with the specimens upon which I founded 

 the provisional species of Aviculopecten subanisotus,' 2 and I find, as I then antici- 

 pated, that they are one and the same. The posterior ear as represented in Phillips's 

 figure is incorrect ; in the specimen it is broken away, in the perfect shell the valve 

 expands gradually into it, and there is no notch as shown in the figure referred to. 



20. Plagiostoma (Phillips, t. 6, f. 23). 



Probably an Aviculopecten, although I cannot find the specimen. 



21. Pecten inter stitialis, Phillips sp. (p. 212, t. 6, f. 24). 



The figured specimen is not in the Gilbertson Collection, although there are 

 several specimens so labelled, with very few and coarse ribs, resembling in this 

 respect Aviculopecten Murchisoni, M'Coy. 3 



22. Avicula sublobata, Phillips sp. (p. 211, t. 6, f. 25). 



The type is not in the Gilbertson Collection. I cannot therefore institute a direct 

 comparison with those shells I described 4 some time ago, under this name, showing 

 colour bands. 



23. Pecten deornatas, Phillips sp. (p. 213, t. 6, f. 26). 

 Not in the Gilbertson Collection. 



24. Pecten simplex, Phillips sp. (p. 212, t. 6, f. 27). 

 The specimen appears to have been mislaid. 



25. Pecten fimbriatus, Phillips sp. (p. 213, t. 6, f. 28). 

 The type is not in the Gilbertson Collection. 



26. Gorbula? senilis, Phillips sp. (p. 209, t. 5, f. 1). 

 Not in the Gilbertson Collection. 



27. Sangainolaria ? angustata, Phillips sp. (p. 208, t. 5, f. 2). 



In a very imperfect state of preservation. This was made by M'Coy the type of 

 his genus 8<mguinolites,° but the specimen is utterly useless for type-purposes. 



28-32. Sanguinolaria tumicla, Phillips sp. (p. 209, t. 5, f. 3). 



S. arcuata, Phill. (p. 209, t. 5, f. 4), S. sulcata, Phillips sp. (p. 209, t. 5, f. 5), 

 Solemija primceva, Phillips sp. (p. 209, t. 5, f. 6), and Venus elliptica, Phillips sp. 

 (p. 209, t. 5, f. 7), are in other collections. 



33. Venus parallela, Phillips sp. (p. 209, t. 5, f. 8). 



A much worn little shell, but possessing strong concentric prominent ridges when 

 in the perfect condition. It is placed in the genus Cypricardia by Prof. L. G, de 

 Ebninck. 6 



34. Isocardia oblonga, J. de C. Sowerby (Phillips, p. 209, t. 5, f. 9). 

 A very good example with the outer shelly layer removed. The valves are in 



apposition, the left moved a little out of place. I have compared this with 

 Sowerby's type, and find that it agrees intimately. 



35. Cypricardia rlwmbea, Phillips sp. (p. 209, t. 5, f. 10). 



The type of this species does not correspond with the shell I have been in the 

 habit of calling by this name, or have usually seen so labelled in collections. 



1 Min. Con. vol. vi. p. 144. 



2 Mems. Geol. Survey Scot., Expl. 31. 



3 Synopsis Carb. Limestone Foss. Ireland, 1844, t. 18, f. 3. 



4 Geol. Mag. 1876, Dec. II. Vol. III. p. 151. 



5 Synop. Carb. Limestone Foss. Ireland, p. 48. 



6 Deserip. Anim. Foss. Tert. Carb. Belgique, p. 97. 



