190 Dr. J. S. Thomson on the 



strife and each bearing a row of stout recumbent overlapping 

 setre, the alternate intervals also with a row of erect scale- 

 like setse . 



Long. 2^-2^ lat. f mm. 



ASSAM : Goalpara {E. P. Stebbing). 



Found under the bark of a sal-tree (Skorea robusta). 



Allied to Ilimatium pubescens, Woll., from Malabar, 

 but that species differs inter alia in the following points : — 

 The rostrum projects less abruptly from the head and is 

 slightly curved, the punctation being equally coarse through- 

 out ; the head is extremely finely and sparsely punctate ; 

 the punctures on the prothorax are not reticulate, the inter- 

 spaces being much broader than in H. asperum, and the sides 

 of the prothorax are distinctly rounded ; in the unique type 

 the dorsum of the elytra is almost bare, but appears to have 

 been abraded. 



XXI. — Observations on the Coloration of Echinus angulosus, 

 A. Agass. By J. Stuaijt Thomson, Ph.D., F.L.S., 

 F.R.S.E., Lecturer in Vertebrate Zoology, Victoria 

 University of Manchester. 



In 1904 F. Jeffrey Bell, in describing the Echinoderma 

 found off the coast of South Africa, writes on the coloration 

 of Echinus angulosus, A. Agass., as follows : — " The spines of 

 this species appear to be pretty constantly either red or 

 purple ; the difference is so marked, and seems to be so 

 equally divided among the specimens that it appears to me 

 that it would be worth while to make observations on fresh 

 specimens to see if it is due to differences of sex. I do not 

 think this difference can be regarded as specific, notwith- 

 standing Dr. Mortensen's statement that colour is an excel- 

 lent guide for distinguishing the species of Echini." 



This species, Echinus angulosus, occurs abundantly at 

 various localities on the shore of and in shallow water off the 

 South African coast. During a period of work at Gape 

 Town I took the opportunity of noting the colours in a large 

 number of living specimens of Echinus angulosus, and the 

 first object of this short paper is to show that there are no 

 facts to support the supposition that the coloration of this 

 species may be regarded as a secondary sexual character. 



A. Agassiz has described and figured Echinus angulosus, 

 and he has also given a list of the synonyms and stated the 



