Vol. 59.] 



SOLEKOMOliPHA MAJOR. 



335 



the Museum of Practical Geology, Jermyn Street. The specimen is 

 that of a perfect left valve, evidently a full-grown example, 

 somewhat crushed along the hinge-line. The gradually-tapering 



posterior end and 

 general shape point 

 to the genus Soleno- 

 morpha, to which I 

 now refer it without 

 hesitation. S. major 

 is so much larger, 

 more compressed, and 

 deeper than S. minor, 

 that there is no 

 danger of the two 

 species being 

 fused. 





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con- 



•4- x •> \ " 





o3 



t-i 



o 



I have described 

 and figured two 

 species of Soleno- 

 morpha in my Mono- 

 graph of the Carboni- 

 ferous Lamellibran- 

 ehiata, vol. i, pt. v 

 (1900) pp. 413-14 

 (Palseont.Soc.vol.liv). 

 At that time I had 

 unfortunately very 

 poor material for 

 study and illustra- 

 tion of S. minor and 

 S. parallela, the two 

 species described. 1 

 have since obtained 

 a very fine, almost 

 complete example of 

 ; J f S. minor, from the 

 Wp*$Mf0l Carboniferous Lime- 

 0, stone of Yeat-House 

 Quarry, near Frizing- 

 ton (Cumberland), 

 which is figured 

 here (fig. 2, p. 336), 

 to compare with 

 S. major. In this 

 specimen, which is a 

 „.,.,: - --.,.-.. ~ j \-" "'^ cast of the interior, 



the anterior adductor 

 muscle-scar is well shown, and also the broad upper surface of the 

 shell, with a parallel groove on each side of the hinge-line. 





