2 ro 



VINE : ^IICRO-PAL^ONTOLOGY. 



9 Cytherella valida ? or variety. 



10 Cytherella valida, with traces of pitting. 



11 Darwinella, 1 Berniciana Jones. 



12 Cythere, sp. nov. 



13 Leperditia, ? Okeni, var. attenuata. 



LEPERDITI^D^. 



14 BeyricMa tuberculospinosa Jones and Kirkby. 



15 Kirkby a Urii Jones and Kirkby. 



Both of these species have been identified for me by Mr. Kirkby, 

 and I have only three specimens — two of No. 14, and one of No. 15. 

 Both are very dehcate forms, and the BeyricMa species is the only 

 specimen of this genus that I have found in these lower Shales. In 

 my December paper (NaturaUst, p. 98), it will be noticed that I 

 give from the Mountain Limestone horizon another Beyrichia, 

 B. crinita J. and K. In the Scotch Shales, Beyrichise are tolerably 

 common, and in the Silurian Rocks very common. Kirkbya Urii 

 J. and K. is also common in the Scotch Shales of Robroyston, 

 Brockley, and High Blantyre. 



ECHIIsrODERMATA. 



Fam . HOL 0 THUR OWE A . ? 



1 6 Perforated plate of some — to me — unknown species, I am 



unable to locate the form indicated by the figure i6, but I 

 consider it of sufficient importance to be placed in this 

 list. The plate is very small and it has a central circular 

 perforation, surrounded by six other circular perforations. 

 With my Entomostraca slides I submitted this, and two 

 other obscure forms, to the judgment of Mr. J. W. Kirkby, 

 and he returned it to me marked ? Holothnrian, 

 With regard to this order of the Echinodermata, Professor H. A. 

 Nicholson (Manual of Palaeontology, p. 305, vol. I. ed. 1879) says: 

 ' As might have been expected from the generally soft nature of their 



integuments, the Holothuroids are hardly known as fossils 



The only remains referred with any probability to this order are 

 certain calcareous spicula which have been found in deposits as old 

 as the Carboniferous, and also in strata of both mesozoic and 

 tertiary age, and which have been regarded as belonging to forms 

 related to Synapta. . . . .' Mr. Robert Etheridge, jun., found in 

 washings of the Limestone Shales (see Desc. of Sheet 23, Scot. Geol. 



Naturalist, 



