232 



BRITISH PALAEOZOIC ASTEROZOA. 



Measurements. — The specimen is of almost exactly the same size as the type of 

 the species. R. is approximately 17 mm. and there were apparently about 18 

 adambulacralia on each side of an arm ; r. is approximately 6 mm. 



Horizon and Locality.— Wenlock Limestone; Dudley, Worcestershire. 



M.AP 



Text-fig. 168. — Drawing of an arm and the neighbouring interradii of Palasterina antiqua (specimen 

 previously referred to Palasterina bonneyi, Gregory). Ad., Adambulacralia; Am., ambulacralia ; M, (?), 

 madreporite ? ; M.A.P., mouth-angle plate, x 10. 



Remarks. — The specimen differs from the type in the swollen nature of the 

 adambulacralia and the greater irregularity of the interradial plates. These do 

 not seem to me to warrant specific distinction. In the absence of more material I 

 do not think it is advisable to name the variety. 



(3) Description of " Palaeasterina bonneyi" (/'/. XVI, fig. 2; Text-fig. 108). 



Material. — Two imprints, one with counterpart, in the British Museum (Nat. 

 Hist.), nos. 40299 and 4-0301 respectively. The former is the specimen described 

 by Salter as P. primsevus in 1857. Gregory later described it as a new species, 



