290 Mr. R. Etheridge, Jun., on the Gasteropoda 



it is difficult to say what relation the apex bears to the margin 

 in position. It is the 



Patella scutiformis, Phillips, loc. cit. ; M'Coy, Synop. Carb. Foss. Ireland, 

 1844, p. 46; Morris, Cat. Brit. Foss. 2nded. 1854, p. 266. 



Patella sinuosa, Phillips (p. 223, t. 14. fig. 2). 



This figure is an accurate representation of the fossil it re- 

 presents. Phillips describes the surface as smooth; this, 

 however, it can hardly be said to be ; for there are decided 

 irregularities, caused by the obtusely rounded concentric undu- 

 lations of growth. The apex appears to have been broken, 

 but was probably acute. It is the 



Patella sinuosa, Phillips, loc. cit.; PDe Koninck, Animaux Foss. p. 326, 

 t. 23. fig. 4, a, b ; Morris, Cat. Brit. Foss. 1854, 2nd ed. p. 266. 



Patella niucronata, Phillips (p. 223, t. 14. fig. 3) . 



The collection contains two specimens of this species ; but as 

 both are imbedded in matrix, it is difficult to conceive how 

 either can be the original of the figure in question. Under 

 these circumstances I think' it not improbable that the latter 

 is meant for a restoration. Notwithstanding this, it appears 

 to be a good species, which may be distinguished by the de- 

 pressed form, orbicular outline, central acute apex, and almost 

 plain surface as compared with the other species of the genus. 

 It is the 



Patella mucronata, Phill. loc. cit. ; M'Coy, Synop. Carb. Foss. Ireland, 

 1844, p. 46 ; Morris, Cat. Brit. Foss. 2nd ed. 1854, p. 266. 



Patella curvata, Phillips (p. 223, t. 14. fig. 4) . 



The figure of this species would, to all intents and purposes, 

 pass for that of an Astarte badly drawn. No Gasteropod in the 

 whole of the Gilbertson collection bears the slightest resem- 

 blance to this figure ; but, on the contrary, two specimens 

 labelled as P. sinuosa are beautifully preserved examples, 

 conical, with a nearly central apex, a plain non-sinuous basal 

 edge, and ornamented with fine, concentric, thread-like lines 

 of growth. 



Baron de Eyckholt has figured* a shell, under the name of 

 Emarginula carbonifera, which, omitting the ventral depres- 

 sion in the side, has the exact appearance of the specimens 

 labelled P. sinuosa ; only the latter are much larger. It 

 is the 



Patella curvata, Phillips, loc. cit. ; Morris, Cat. Brit. Foss. 2nd ed. 1854, 

 p. 266. 



* Mem. Couronnes Acad. R. Belg. 1852, xxiv. p. 43, t. 1. tigs. 19, 20. 



