ACTINOrODOrs nOLOTITTT^TOIDrA. 71 



examination of tlie throe species first mentioned convinces me 

 tliat they resemlVle one anotlier very closely in almost everv 

 anatomical detail : in the calcareous deposits, tlie structure of 

 the Cuvierian tubes, in tlie arrangement of the Polian vesicles 

 and of the stone-canal, in the nature of ambulacral appendages, 

 etc. But the reason wliy I have kept //. marmorafa and H. argus 

 separate and have ventured to lun-den the already overstocked 

 nomenclature hy establishing tlie present species is, that each of 

 the three species has very characteristic and well-estabhshed 

 color-markings of its own. It is true that one can not place much 

 reliance on mere external markings, l^ut in these cases they 

 are so constantly and strikingly different, and so entirely without 

 intermediate gradations, that the three species are distinguished 

 with ease by the Liu- Kin natives and have different names 

 assigned by them. Such differences should also be taken notice 

 of in science, and distinctive names be given the species for 

 future reference. Whether the differences are specific or varietal 

 can perhaps only be determined by a long study on the sj^ot, 

 and even then it may after all turn out to be a mere matter of 

 fancy whether they should be assigned specific or varietal values. 

 For the present, I have thought it best to give them specific 

 values. 



19. Holothnvla einer riscens (Brandt). 

 (Textfij?. Ifi). 



Stichopus {Gymnochirota) cinerascens Brandt 1835, p. 51. — Ludwig 1881, 

 p. 597. 



? liololhiria umIrina KürrEL k Leückart 1828, p. 10, Taf. lb, Fig. 4. 



StlcJtoptis cinerascens (?) Grube 1840, ]). 3G. — Selkxka 18(!7, ]). 319, 

 — Semper 1807 — "08, pp. 74, 275. 



