120 

 15. Toxopneustes pileolus (Lamk.). 



Echinus /lileoliis. Lamauck. 1S16. Animaux sans vertèbres. III. p. 45. 



Boletia pileolus. Aoassiz. & Dksoh. lS4(i. Catalogue raisonné des Kchinides. p. 3G2. 



Toxopneustes pileolus. Agassi/,. 1872. Revision of Echini, p. 1()7, 497. 1*1. \'lll.l). i — 3, XXV. ao, 2i, 



XXXVIII. 16—17. 



Boletia pileolus. Dk Lohiol. 1883. Catalogue rais. Kchinod. île Maurice, p. 27. 

 Toxopneustes pileolus. Oöderi.kin. 1885. Seeigel v. .Ia])an u. d. Liu-Kiu-Inseln. p. 2<\. 



- — Wai.tkh. I8S5. Ceylons Echinodermen. .len. Zeit.schr. f. Naturw. X\'I1I. p. 375 

 ^ — KoEHLKU. 1895. Catalogue rais. Echinod. îles de la Sonde, p. 414. 



- — MoHTKNSEN. 1903. Ingolf-Ecliiiioidea. I. p. 111. PI. XXI. 13, 21, 41. 



- — DE Memerk. 1904. Sihoga-Eehinoidea. p. 92. Taf. XVII. 280 85. 



Non: Boletia rosea A. Ag. (Comp. Ingolf-Echinoidea. I. p. 111). 



— : — bizonata Desor. 



— : Echinus trizonalis Blv. 



Five specimens were taken at Koli Mesan, 10 — 15 fatlioms, on hard bottom. 

 On one of them a beautiful Ophiuiid was found on the actinal side: also the small 

 crab, mentioned under Salmacis bicolor, was found on this species, denuding also 

 here the part of tlie test, wliere it had taken its place. 



The well known transverse bands are rallier differently developed, in one 

 specimen almost quite wanting, in another very distinct; but the white zones are 

 very narrow, the test looking thus rather different from the Polynesian specimens, 

 where the white and violet or green bands are generally equally large. According 

 to DE LoiuoL the specimens from Mauritius have no transverse bands; 1 must, 

 however, remark that in a specimen from Mauritius in the Copenhagen-Museum 

 the white transverse bands are found, though very narrow. Possibly the Indian 

 specimens may be distinguished from the Polynesian ones as a distinct variety; 

 but so far as I can judge from the material at my disposal no other differences 

 can be pointed out than the colour of the lest. In the pedicellariæ no difference 

 is found. 



In the „Ingolf"-Echinoidea (loc. cit.) I have said that no spines are found 

 on the buccal plates in T. pileolns. This is not quite correct; there may be found 

 a few small spines thereon, which holds good also for 7'. roseus. — The genital 

 glands are of a curious reticulate structure; they are long and narrow, passing 

 along the median line of the Interambulacra down to the actinal side. Some bilia- 

 mate spicules are found in their walls; the walls of the intestine contain almost 

 no spicules (bihamate). 



Echinus trizonalis Blv. and Boletia bizonata Desor are stated by Agassiz and 

 later authors to be synonymous with T. pileolus; as I have examined the type-speci- 

 mens of these „species" in Paris, I can positively affirm that this is not the case. To 

 be sure, the type-specimens are only naked tests, but the fact that they have a pri- 

 mary tubercle on all ambulacral plates sufficiently shows that the}' cannot be the 

 young of T. pileolns. There can scarcely be any douhl that they are either Psumni- 



