1898.] PEOM rtrNAFUTi a^jd hotuma. 837 



A. parvula is tbe young of A. flavocastanea, and all the evidence 

 seems to favour the identity of the two forms. 



Colour uniform brown ; number of tentacles 18 in one specimen 

 (not countable in others). 



Deposits agree almost exactly with Selenka's description and 

 figures ; the tables (Plate LII. fig. 1 6) are very crowded, frequently 

 overlapping, and form a layer outside the buttons (fig. 1 c), which 

 rarely possess less than 4 pairs of holes. The spiny rods men- 

 tioned by Seleuka as occurring in the dorsal feet are very scarce 

 (fig. 1 cZ), but sieve-plates (tig. 1 c) occur arranged in circles below 

 the end-discs of the ventral and some of the dorsal feet. 



The ventral feet are arranged in very distinct rows ; dorsal feet 

 much smaller and more papilliform and not arranged in rows ; 

 anal teeth five in number, small, and forming more or less irregular 

 oval fenestrated plates, recalling the anchor-plates of some species 

 of Synapta. 



I could not make certain of the maturity of any of the specimens, 

 but in one of the smallest, the only one of which I cut sections, 

 ova were developed on the dorsal mesentery ; the same specimen 

 possessed one stone-canal completely embedded in the mesentery, 

 two Polian vesicles, and tolerably well-developed tentacular 

 ampullae ; Cuvierian organs were very well developed in all the 

 specimens opened. 



Prom the above description it will be obvious that the only 

 points of distinction that can be maintained between A. parvula 

 and A. jlavocastanea are (1) colour and (2) size ', both of which 

 may be due either 1) to age or (2) to local variation. 



UoLOTHUKiA ruscociNEREA Jaeger, var. pervicax Selenka. 

 (PlateLII. figs. 2a,6.) 



Holothuria pervicax Selenka; E. Selenka, Z. f. w. Z. xvii. 1867, 

 p. 327, Taf . xviii. fig. 54. 



Holothuria depressa Ludwig ; H. Ludwig, Arb. a. d. zool.-zoot. 

 Inst, in Wiirzb. 1875, p. 108, Taf. vii. fig. 44. 



Holothuria mammiculata Haacke ; Mobius, Meeresfauna d. Ins. 

 Maur. u. d. Seych. 1880, p. 48. 



Var. of //. fuscocinerea Jaeger et Semper ; G. P. Jaeger, De 

 Holothuriis, 1833, p. 22 ; C. Semper, Eeisen im Arch. Phil. 

 Bd. i. Hoi. 1867, pp. 88, 250, Taf. xxvii. & xxx. fig. 22= H. curiosa 

 Ludwig ; H. Ludwig, Arb. a. d. zool.-zoot. Inst, in Wiirzb, 1875, 

 p. 110, Taf. vii. fig. 29. 



References. H. Ludwig, Ber. Oberh. Ges. Wien, xx. 1883, 

 p. 173. 

 H. Theel, ' Challenger ' B,eports, xxxix. Hoi. ii. 1885, 

 pp. 220-222. 



Distribution. The species is widely distributed over the Indo- 

 Pacific area, extending as far "W. as Japan. Pour specimens from 



'^ From the Zool. Eecord, 1895, it appears that Sluiter has described a 

 specimen of A. flavocastanca 20 cm. long. 



