262 MR. A. V. MICHAEL OX A xEw [Mar. 14, 



Pentagonaster meridionalis, id. Phil. Trans. 168. (1879) p. 276. 

 Gnathaster meridionalis, Sladen, Cliall. Eep. Ast. (1889) p. 287. 

 Gnathaster pilulatus, id. t. c. p. 292. 



8. Odoxtastee millvris. 



Astrogonium miliare, Gray, P. Z. S. 1847, p. 79. 



Gnathaster miliaris, Sladen, Chall. Eep. Ast. (1889) p. 750. 



I include tbis species on Mr. Sladen's authority ; the only speci- 

 men of it that I have seen, that described by Dr. Grray, has the 

 mouth-parts so poorly preserved that I cannot say whether or no 

 it had the spines which are characteristic of this genus. 



9. OnOXTASTER PAXILLOSUS. 



Astrogonium paxillosum, Grray, P. Z. S. 1847, p. 79. 

 Gnathaster paxillosus, Sladen, Chall. Eep. Ast. (1889) p. 750. 



10. Odoxtasxer pedicellaris. 



Asterodon pedicellaris, Perrier, Miss. Cap Horn (1891), p. K. 135. 

 For the limits of this species, see the remarks under 0. grayi. 



11. OnOXXASTER SIXGUL-VEIS. 



Goniodiscus singularis, M. Tr., Arch. f. Xat. 1843, p. 116, 

 Pentagonaster singulccris, Perrier, Arch. Zool. exper. v. (1876) 

 p. 38. 



Gnathaster singularis, Sladen, Chall. Rep. Ast. (1889) p. 750. 

 Asterodon singidaris, Perrier, Miss. Cap Horn (1891), p. K. 134. 



Mr. Sladen includes Goniodiscus verrucosus, Phil., under Gnathaster 

 with a siarn of doubt. 



4. On a new Genus and Species of Acari found in 

 Cornwall. By A. D. Michael, F.L.S., F.Z.S., 

 P.K.M.S., &c. 



[Eeceived March 11, 1893.] 



(Plate XYIU.) 



In November 1892 I was staying near the Land's End, Cornwall : 

 in one of the small rocky bays which are found along this granite 

 coast a little stream of fresh water comes down from the cliffs 

 in the middle of the bay ; at the edge of the stream, where it only 

 trickled, and near enough to the sea to be within the influence of 

 wind-carried spray, some considerable patches of the small green 

 water-weed Cladophora fracta were growing. Amongst this weed I 

 found examples of several species of Acarina, and was taking the 



