1880.] 



PROF. F. J. BELL ON THE TEMNOPLEURID.«. 



429 



The last specimen had spines of three lengths— 8, 13, and 9a 

 millims. long being averages. 



This species has been very well figured by Uesor (Synopsis des 

 Echin. fossiies, pi. xvii. figs. 1 1-12). 



2. Salmacis dtjssumieri, Ag. 



S. dussumieri, Agassiz & Desor, Cat. Rais., Ann. Sci. Nat. (3) 

 vi. p. 359. 



Toreumatica concava, Gray, P. Z. S. 1855, p. 39. 



This species is so well marked that it is unnecessary to give as 

 full an account of it as of the preceding species. It is certainly not 

 the most nearly allied of the genus to Temnopleurus toreumaticus ; 

 and Prof. Alex. Agassiz seems to be completely justified in asso- 

 ciating the Toreumatica concava of Gray with the representatives of 

 the genus Salmacis '. 



Very few spines remain on the five tests in the Museum col- 

 lection; what there are are quite close to the actinostome, and are 

 of a milky-white colour ; some must have been of some strength, 

 and others more delicate ; the longest I could measure was 4 milUms. 

 long (from a test 32 millims. in diameter). The ocular plates may be 

 shut out from the anal area ; the anal orifice seems to be placed at the 

 edge, and not in the centre, of the anal area ; when there are 

 vertical rows of tubercles on each half of the ambulacral plates, the 

 tubercles do not form transverse rows, but are set alternately. The 

 auricles are connected by ridges about half their height. 



3. Salmacis rarispina, Ag. 



Salmacis rarispina, Agassiz & Desor, Catal. Rais., Ann. Sc. Nat. 

 (3) vi. p. 359. 



This is, on the whole, one of the most easily recognizable of the 

 species of this difficult genns ; but its distribution appears to be 

 somewhat unusual if the locality of " Portugal," attached to one of 

 the specimens in the collection, be correct ; it will he safer, however, 

 to wait for further examples of the occurrence of this form off the 

 Portuguese coast. 



It is at once distinguished not only by the flesh-coloured lozenge- 

 shaped patterns ou its yellowish-green upper surface, but by its 



^ T. concava was not the type of Gray's genus Toreumatica ; nor is there any 

 example of the species in coll. B. M. which is known to have come from Hong- 

 kong. None of the Museum specimens has any locality attached ; but Gray 

 {loo. cit.) gives " Hah. China." 



