402 
VINE: FNTOMOSTRAOA IN THE WENLOCK SHALES. 
and the outlines of the valves very sharp ; while their ornamenta- 
tions in many cases are fully preserved. There is apparently in some of 
the examples, a slight compression of the valves which I cannot 
account for, otherwise nearly the whole of the forms appear to me to 
be normal in their different stages of growth. 
The large number of specific forms that have been added to our 
Silurian Catalogues of Ostracoda are due to the keen intelligence of 
Messrs. Jones and Holl, rather than to those who picked out the 
Entomostraca from the shale. In some of the mounted series there 
was much difficulty in seperating the forms, previous to mounting, 
hence two, and even three species, are sometimes placed together on 
one slide, but this drawback has been got over by the authors on 
account of the way in which the individual specimens are seperately 
numbered, both in my own, and in Mr. Smith's collection. The 
figures, to which all students are referred, are valuable, but the 
examples are so chronicled in the series that disputes respecting the 
authorship of species can be easily settled by a reference to the 
numbered slides 
The Nos. 22 and 37 are the lowest of tlie fossiliferous zone of 
the Biiildwas Beds, but the Ostracoda, nevertheless, are given 
seperately. 
(a) BuiLDWAS Bed, No. 22. 
Macrocypris symmetrica, Jones and Holl. (Not common). 
„ siliquoides, J. and H. „ 
Pontocypris Mawii, J. and H. CCommon). 
„ ,, var. gibbera, J. and H. ,, 
Bythocypris symmetrica, J. and H. (Not common). 
„ pustulosa, J. and H. „ 
phaseolus, J. and H. ,, 
Thlipsura v -scripta, J. and H. Var. discreta (?) Jones. 
Cythere (?) Vinei. J. and H. 
Cytherella Smithii, J. and H. (Rare). 
Beyrichia Klo?deni M. Coy. 
,, ,, Var. granulata, J. 
„ „ ,, ,, with big lobes. 
„ „ ,, tuberculata Salter. (Common). 
