180 THE APODOTJS HOLOTHURIANS 



:03). Semper ('68) gives some good anatomical details, including a figure of the 

 cloaca, which shows the presence of five large calcareous plates, forming "anal 

 teeth" such as occur in Thyone briar eus and some other holothurians. The re- 

 ported occurrence of this species in the Indian Ocean in comparatively shallow 

 water, by Walsh ('91), is open to serious doubt, although Alcock ( :02) seems to 

 consider the record correct. Koehler and Vaney ( :05) make no reference to either 

 the species or the record, which is rather remarkable. In view of the fact, for 

 which they vouch, that Walsh mistook a Protankyra for an Ankyroderma, we 

 may be pardoned for doubting his identification of an Indian holothurian as 

 Eupyrgus. In the Standard Natural History (Lockington '85), Eupyrgus 

 scaber is classed as an Apneumonous Apoda, and is said to be "the simplest of 

 all holothurians," although Semper 's figures were published nearly 20 years 

 before. It is unfortunate that such a blunder should occur in what is really a 

 "standard" natural history. 



EUPYRGUS PACIFICUS. 



PLATE XII, PIGS. 28-29. 



Eupyrgus pacificus Ostergren, 1905&, p. cxcvi. Calcareous particles, fig. Ib. 



LENGTH. 3-7 mm., with a diameter of 2-3. 



COLOR. Not given, but presumably grayish. 



DISTRIBUTION. Eeported only from coast of Korea, 60-65 m. (Ostergren). 



REMARKS. As Ostergren has compared his specimens, of which there were 

 three, with specimens of scaber of the same size, there is little reason to ques- 

 tion the validity of this species. It is possible, however, that a more complete 

 knowledge of individual diversity in scaber and of its geographical range may 

 show that pacificus is identical with it, particularly since scaber is now known to 

 occur along the Alaskan coast. 



APHELODACTYLA, nom. nov. 



(a^tXos, not rough, simple, + SaxruAa (poetic plural) fingers; in reference to the undivided 



tentacles.) 



Haplodactyla Semper, 1868; non Grube, 1840. 



Tentacles 15, simple and without digits, but with ampullae. Body more or 

 less tapering posteriorly, but there is no distinctly set-off caudal appendage. 

 Calcareous ring very broad, the radial pieces with evident, but short, posterior 

 prolongations. Calcareous deposits often wanting (usually present at extreme 

 posterior end), and when present relatively insignificant, in the form of small 

 oval or dumbbell- shaped bodies or perforated plates. Phosphatic deposits 

 wanting. 



Semper's ('68) great monograph, with its wealth of anatomical detail, first 

 introduced this interesting genus to zoologists, but he unfortunately made use 



