A Revised List of British Ecliiiioidea. 415 



brilliant red, sometimes with white tips ; primaries two or three 

 times as long as secondaries, which do not increase either in size 

 or number towards the peristome. 



Distribution. 



British Seas. — Off the Butt of Lewis, warm area, " Lightning," 

 St. 12, 530 fms. (Thomson, 1). 25 miles N.-E. of Unst, Shetland, 

 95 fms. (Coll. Norman).! N. and W. of Scotland, 125-640 fms. 

 (Thomson, 1). East coast of Scotland (Brit. Mus.). Off Mon- 

 trose, 42 fms.; off Peterhead, 48-60 fms. (Bell, 1). N.-W. of 

 Ireland, " Porcupine " (1869), St. 25, 164 fms. (Copenhagen Mus.). 

 40 miles off Yalentia, 110 fms. (Thomson, 1 ; Coll. Norman). 

 S.-W. of Ireland, 250 fms. (Bell, 3). 



Other Localities. — Norway, 150-250 fms. (Sars; Copenhagen 

 Mus.; Coll. Norman). Cape Sagres, 80 fms., "Porcupine" Exp. 

 (Jide Agassiz, 2). Mediterranean (Brit. Mus.). Tristan da 

 Cunha, "Challenger," St. 135f, 1100 fms. S. of Halifax, Nova 

 Scotia, "Challenger," St. 46, 1350 fms. (Agassiz, 3). Coast of 

 U.S.A., 858-888 fms. (Yerrill). Off Admiralty Is., " Challenger," 

 St. 219, 150 fms. (Agassiz* 3). 



Variety. — Dr Norman's collection contains what appears to be 

 an albino variety of this species. 



14. Echinus microstoma, Wyville Thomson. 



1874. Echinus microstoiaa, Wyv. Thomson, "Porcupine" Ecliin., 



p. 744, pi. Ixviii., figs. 1-10. 



1886. ,, „ Haddon, Rep. S.-W. Ireland, P. R. Irish 



Acad., (2) iv., p. 620. 



1889. „ ,, Bell, Ann. and Mag. Nat. Hist., (6) iv., 



p. 440, pi. xix., fig. 1. 



Diagnosis. 

 At the present moment I cannot regard this species as other 

 than most unsatisfactory. Sir Wyville Thomson's diagnosis is 

 merely provisional, and his figure " by no means good." Professor 

 Bell {loc. cit.) has given us a new figure, but has not ventured 

 upon any differential diagnosis. I have had the opportunity of 

 examining the specimen which Bell {loc. cit., p. 445) says " agrees 

 in all essential characters " with the one which he figures. It is 

 certainly quite easy to distinguish that specimen from all the 



^ This was the first example known to liave been obtained in British seas. 

 It has been identified by comparison with Norwegian specimens. 



