from Japan and the Indian Ocean. 87 



plate and only small tubercles on the rest of the plate. TIjr 

 ainbnlacral plates carry no larp;c tubeicles. Tlie abactinal 

 side diHers rather strikin;;ly from that of the type ((Jiiall. 

 Ecli. pi. xix. A. Hg. 2j, there being a distinct primary tubncle 

 on every second interambnlaeial plate, forming a conspienous 

 regular vertical series. The memlnanous interstices bi-tween 

 the plates are distinct ; the plati's are not obliquely 

 directed, as in the type, but quite regularly horizontal. Tlie 

 same holds good for the anibulacral plates, which iiave only 

 a few larger tubercles. The ])ores are arranged as in the 

 type specimen of tessellatum. The differences in the test, 

 together with that in the |)cilicellariiv, would not seem to 

 justify de ^Meijere's view that it is a young A. tessellatum. 

 However, as i iiave no mateiial of this species, 1 do not 

 venture to pronounce a deiinite opinion, but shall be content 

 with giving the above particulars of the specimen in question. 



2. Asthcnosoma iji'mai, Yoshiwara. 

 (PI. III. figs. 1,2; PI. V. tigs. 1-3, 10, 12-U.) 



Asthenosomn ijimai, Yosliiwani, 1897, "On Two new Species of 

 A>tln-nos<jmti ti-i in tlie Se;i of Saguiui," Auiiotationed Zool. Japoii. i. 

 p. 8, pi. ii. tigs. 6-12. 



The four specimens b( fore me agree very well with the 

 description given by Yoshiwara. Figures are here given of 

 the species Irom photographs, the figures given by Yoshiwara 

 being rather unsatisfactoiy. Otlicrwise I need not add 

 anything to the description of the structure of the test, e.veept 

 of the madreporic ])late. According to Yoshiwaia it is 

 " divided into tour separate pieces of unequal size, the largest 

 occupying the normal position," a feature which he thinks 

 is meiely an individual abnormality. It cannot properly be 

 said that the madreporic |)Iate is divided; it is the madreporic 

 pores which have spread over the neighbouring |)lat-S, a 

 feature known also in A. varium (Doderiein and de L)riol), 

 and upon the whole not very seldom oecuiring among Ec!unid>. 

 It is seen in all the four specimens, and must thus certainly bu 

 regarded as a normal feature. 



Of the pedicellariie, Yos'.iiwar.i only says he has found two 

 kinds, '* one large and long-headed, the other small, long- 

 stemmed, and triliJ^' ; no figures are given. As in the other 

 species of .d.s//<eno.yo//(a, oidy tndentate and triphyllous pedi- 

 cellaiiit occur. Ut the tridcnt.ite ones 1 lind only two forms, 

 corresponding to the larger and smaller i'orm of tlie other 

 species of this genus (eomp. * Ingolt ' Echinoidea, p. 4U). In 

 the larger form (PI. V. ligs. 2, 12) (head up to 2-2 mm.) 



