IN THE MANCHESTER MUSEUM. 13 



Three specimens are in the Gibson Collection, none of 

 which agree very closely with the figure. The largest 

 specimen is probably the one from which Brown drew his 

 figure. Length, lo mm.; breadth, 12 mm. 



High Green Wood, Todmorden, Yorks. 



Yoredale Shales, Carboniferous. Coll. Gibson. 



Ctenodonta Cambrensis, Hicks, 1873. 



1873. ctenodonta Cambrensis, Hicks, Quart. Journ. Geol Soc, xxix., p. 47, 



pi. v., figs. 8 and g. 

 1873. ,, elongata, Id., In Salter, Cat. Camb. and Sil. Foss., 



p. 24. 



Type. — Internal cast, the original of Fig. 9. 



Ramsey Island, S. Wales. 



Tremadoc Slates. Coll. Homfvay. 



Modiolopsis Cambrensis, Hicks, 1873. 



1873. Modiolopsis Cambrensis, Hicks, Quart. Journ. Geol. Soc, xxix., p. 49, 

 pi. v., fig. 14. 



Type. — Shell over 25 mm. in length by about 12 mm. 

 wide. Ovate ; inflated along hinge-margin. Anterior border 

 obtusely rounded ; posterior border pointed. Surface covered 

 by concentric lines of growth. 



Ramsey Island, S. Whales. 



Tremadoc Slates. Coll. Ligktbody. 



Trigonia Spinosa, Parkinson, 181 1. 



1811. Trigonia spinosa, Parkinson, Organic Remains, iii., pi. xii., fig. 7. 

 1815. ,, „ Sowerby, Min. Conch., p. 196. 



1854. „ „ Morris, Cat. Brit. Foss,, p. 229. 



1875. ,, ,, Lycett, Monogr. Foss. Trigonia, Palasont. Soc, 



p. 136, pi. xxiv., fig. 9. 



Type. — Original of Lycett's figure. One valve only. 



Blackdown, Isle of Wight. 



Greensand. Coll. Williamson. 



