ACTINOPODOÜS HOLOTHURIOIDEA. 163 



The original specimen of Selenka was only 5 cm. long. The 

 only other investigator who has examined this s][3ecies is Lam- 

 PERT, and he also gives 5 cm. as the average length of the spe- 

 cies. Now it is possible that the difference in the calcareous 

 deposits of this species and S. liorrens is due simply to a differ- 

 ence in age. The number of tentacles is not a wholly reliable 

 character. It is therefore possible that this species may prove to 

 be the same as >S^. horrens or only a variety of it. But at pre- 

 sent, the differences are too great and leave no choice but to 

 describe this as a new species. An individual in lot No. 1342, 

 4 cm. long, does not show any large tables distributed at regular 

 intervals, nor any conical tables at the base of the pedicels. 



A F'ierasfer is said to have come out of specimen No. 1342. 



I have pleasure in naming this species after the late Mr. 

 HiEOTA, a friend and pupil of mine, who spent some time explor- 

 ing the Ogasawara Islands and collected a set of the specimens 

 under consideration. His untimely death cut off a career of much 

 promise. 



38. Stichopiis japoniciis Selenka. 

 (PI. IV., figs. 32—44 ; textfig. 29). 



Sticliopm japoniciis Selenka 1867, p. 318, Taf. XVIII., Fig. 33-36. 

 —Semper 1867— '68, p. 74.— v.Marenzeller 1881, p. 136, Taf. V., 

 Fig. 11.— Lampert 1885, p. 104.— Théel, 1886«, pp. 160, 194, PI. 

 Vn., fig. 3.— Ludwig 1887?>, p. 1242.— Ludwig 1889—92, p. 331.— Mi- 

 TSUKURi 1896, p. 408.— MiTSUKURi 1897«, p. 31.— Östergren 1898, p. 134.— 

 Sluiter 19016, p. 142.— Clark 1902«, p. 563. 



Holothiria arnuita Selenka 1867, p. 330, Taf. XVIII., Fig. 66.— Lam- 

 pert 1885, p. 91. 



Stichopus armatiis ? Semper 1867 — '68, p. 75. — v. Marenzeller 1881, 

 p. 121. 



