R. Etheridge, Jun. — On Carboniferous Mollusca. 151 



Limestone Group), at Carlops, Peeblesshire, collected by Mr. James 

 Bennie, after whom I beg to name the species. Head of Mouse 

 Water, Wilsontown, Lanarkshire, in shale connected with the Hosie 

 Limestone, collected by Mr. A. Macconochie. Collection of the Geo- 

 logical Survey of Scotland. 



Lamellibranchiata. 



Genus Aviculopectbn, McCoy, 1851. 



Aviculopecten planoradiatus, McCoy. 



A. planoradiafus, McCoy; Annals Mag. Nat. Hist. 1851, vol. vii. p. 171. 

 „ „ „ ; Brit. Pal. Foss., p. 489. 



,, „ Huxley and Etheridge, Cat. Foss. Mus. Pract. Geol. 1865, p. 110 



(without description). 

 ,, „ Armstrong and Young's Cat. Foss. W. Scotland, Trans. Geol. 



Soc. Glasgow, vol. iii. Supp. 1871, p. 47 (without description). 



Ohs. — To Prof. McCoy's excellent description of this shell I can 

 only add a few notes on the ornamentation of the shell. The broad, 

 flat, depressed ribs are covered by concentric, somewhat irregular, 

 wavy, more or less imbricating scales. The colour markings on the 

 specimen before me consist of fluctuating thin concentric bands pass- 

 ing into blotches, sometimes assuming a widely zigzag pattern, and 

 in the present condition are of a darker colour than the remaining 

 portions of the shell. 



Log. — Longnor, Derbyshire. Coll. Mus. Pract. Geol., London. 



Aviculopecten ? suhlohatus, Phillips, PI. VI. Figs. 2-6. 



Avicula sublobata, Phil. ; Geol. York. 1836, vol. ii. p. 211, t. 6, f. 25. 



„ „ Morris, Cat. Brit. Foss. 1843, p. 107 (without description). 



,, „ Tennant, Strat. List. Brit. Foss. 1847, p. 101 (without description) . 



„ „ Bronn, Index Pal. Nomen. 1848, p. 142 (without description). 



55 „ D'Orbigny, Prod. dePal. 1849, vol.i.p. 137 (without description) . 



,5 „ Brown, Foss. Conchology, 1849, p. 162, t. 66**, f. 32. 



Aviculopecten sublobatus, Morris; Cat. Brit. Foss. 1854, 2nd ed. p. 166 (without 

 description) . 



„ „ Huxley and Etheridge, Cat. Foss. Mus. Pract. Geol. 1865, 



p. 110 (without description). 



Sp. Chars. — Shell oval, inequilateral, convex, extended a little 

 obliquely towards the anterior side. Anterior ear of the right valve 

 small, scarcely divided from the body of the shell, or extending as 

 far as the anterior margin, its remote margin slightly oblique to the 

 hinge line ( ? ), and marked with concentric ridges. Posterior ear 

 small and lightly pointed, extending as far as the posterior margin 

 of the shell, marked with delicate striae, and one or two colour bands 

 similar to those on the body of the shell. Hinge line short. Surface 

 ornamented with close fine concentric striae crossed by equally fine 

 and delicate radiating lines, always better marked on the sides than on 

 the body of the shell ; when well preserved, these striae give to the 

 shell a reticulate appearance, but soon becoming worn down leave it 

 nearly smooth. Colour markings in the form of radiating bands 

 variously arranged. 



Obs. — The ears must have been extremely delicate, as of eleven 

 specimens which have come under my notice, onl}^ three show any 

 traces of them. Until we are acquainted with the internal characters 



