J^. Etherldge, jun. — New Carboniferous MoUusca. 303 



the Calderwood Cement Stone; Kirktonliolm Oement Works and 

 Glebe Quarry, E. Kilbride, in the Calderwood Cement Stone (Geol. 

 Survey Scotland). Cunningham Bedland, Craigenglen, and Corrie 

 burn, in the Lower Limestone (Armstrong and Young). The fore- 

 going are all in the Lower Carboniferous Limestone Group. Birk- 

 wood burn, near Lesmahagow, in the shales of the McDonald Clay- 

 band Ironstone, Middle Limestone, or Coal and Ironstone Group'' 

 (Geol. Survey Scotland). The following is in the Upper Carbon- 

 iferous Limestone Group : Gillfoot House, near Carluke, in shale above 

 the Gillfoot or Belston Burn Limestone (Geol. Survey Scotland).^ 

 Mr. C. W. Peach has also obtained this shell from black shale at the 

 Abbey Craig, Bridge of Allan. The original Irish localities are 

 Brucklers, in yellow sandstone ; Linsapaste, in Carboniferous slate ; 

 and in the Culm of Bundoran, Ballintrillick (McCoy). 



In Eussia, recorded as P. Valdaicus, from Limestone at the base 

 of the Carboniferous series on the borders of Bistriza (Valdai). 

 Prof, de Koninck records it from Bleiberg (Carinthia)« 



Genus AvicuLOPEOTEN, McCoy. 



AvicuLOPECTEN OKYZA,^ R, Etheridge, jun. 



A. oryza, R. Etheridge, jun. Mems. Geol. Survey, Expl. 23, Scotland, 1873, p. 103. 



This name was proposed for two portions of a curiously marked 

 pectiniferous shell, which, although fragments, differ so widely in 

 their ornamentation from that generally found in this genus as to be 

 worthy a specific name. One piece shows the remains of the ears 

 and upper portion of the shell, and the other that of the ventral or 

 lower part. The ears appear to have been small. The shell is 

 thin, and covered with peculiar blob-like depressions, arranged in 

 consecutive lines, the markings of one line alternating with those of 

 the next, and so on. These depressions present an appearance as if 

 a number of grains of rice had been uniformly pressed on the 

 surface of the shell, and then remoA'cd, leaving behind them impres- 

 * sions of their forms. Those portions j)reserved show that when 

 perfect the shell was of some considerable size. 



Locality and Position. — Merry and Cunningham's Limestone Pit, 

 near Carluke, Lanarkshire, in shale above the Second Kingshaw 

 Limestone (Geol. Survey Scotland). Collected by Mr. J. Bennie. 

 AvicuLOPECTEN ELLiPTicus, PbilKps. Plate XIII. Fig. 3. 



Peden ellipticus. Phil. Geol. York. 1836, ii. p. 212, pi. 6, fig. 15. 



McCoy. Synop. Carb. Fos. 1844, p. 92. 



Morris. Cat. Brit. Fos. 1854, p. 164. 



Huxley and Etheridge. Cat. Fos. Mus.Pract. Geol. 1868,p. 110. 



Sp. chars. — OA'ate, most convex below the beaks, but generally 

 much compressed and flattened towards the margins, becoming 

 elongate with pressure ; hinge-line short, straight ; ears small, sub- 

 equal, the posterior somewhat the larger, both delicately striated 

 vertically ; shell very thin, papyraceous, and nearly smooth, often 

 wrinkled irregularly ; muscular scar large and sub-central. 



1 The Lower Coal-measures of some writers. 



2 The Survey specimens were collected by Messrs. Bennie and Macconochie. 

 * Gr. oov^a, rice. 



