846 MR. F. p. BEDFORD 0>' HOLOTHUHIAXS [XoV. 1"), 



but are undoubtedly separate deposits ; calcareous ring not closelj^ 

 examined ; 5 short retractor muscles and several Polian vesicles 

 occur. 



Chiridota ixtermedia, sp. nov. (Plate Llll. figs. 6 a-d.) 



References. H. Ludwig, Arch, de Biol. t. ii. 18S1, pp. 41-58, 

 pi. iii. (C rotifera). 

 E. Semon, Mitth. a. d. zool. Stat, zn Neap. vii. 1887, 



p. 272, Ta£. x. 

 H. Ludwig, Z. f. w. Z. liv. 1892, p. 350, Taf. xvi. 

 A. Dendy, Journ. Linn. Soc, Zool. xxvi. 1897, p. 49. 



Several specimens from the mangrove swamp, Funafuti, average 

 about 22 mm. X 4 mm. : largest under 3 cm. long. Colour whitish, 

 transparent near posterior end of body. 12 or 13 tentacles (out 

 of 4 individuals, 2 had 12 and 2 had 13); pinuye subequal, about 7 

 in number, the proximal pinnae being situated some distance from 

 base, tei-minal ones not forming a pair longer than rest. 



Wheel-papillae in a somewhat irregular single row in each 

 interambulacrum (except at anterior end, where they are more 

 crowded) ; the two ventral interambulacra contain very few papillae, 

 being often quite devoid of them in the middle of the body 

 (cf. C. lewis) ; the papillae are opaque, white, and rather conspicuous. 

 Wheels and curved rods present. The wheels (figs. 6 «, h) are very 

 similar to those of other species of Chiridota; a cover-plate is present 

 over the basal plate and its centre is closed ; there is no central 

 pillar between the base and cover-plate ; the upper rim only of the 

 wheel is toothed, and there is a distinct notch in the cover-pl.ate 

 between its radii ( = " Speichen-Platten,"' Ludwig). Dendy (Lc.) 

 described the fully- developed wheels of Trochodota dunedinensis 

 {Chiridota dunedinensis Parker) as situated with their faces 

 parallel to the surface of the body, and so arranged that the 

 toothed edge is always directed outwards ; in consequence he uses 

 the terms " outer " and " inner " faces of the wheels : in C. inter- 

 media the arrangement is different ; the wheels are arranged in 

 each papilla so that the toothed edge of the wheel is nearly always 

 directed away from the centre of the papilla, so that those wheels 

 on the inside of each papilla have the toothed edges facing 

 the opposite May to those on the outside of the papilla. It 

 seems better, therefore, to use the arbitrary terms "upper" 

 and " lower " in the sense in which Ludwig has already used 

 them, so that they are applicable to any arrangement of the 

 wheels in the body-wall. The rods (fig. 6 «) are present all 

 over the body and are thickened at the ends and in the middle, 

 the ends being unbranched except in the tentacles (fig. 6(?), where 

 they are also longer and narrower (cf. C. Uberata and C. rotifera 

 and tentacular deposits of C. pisanii) ; abnormalities of the rods 

 occasionally occur either by the development of a branch from the 

 middle of the rod forming a triradiate spicule, or they may very 

 rarely become S-shaped, a condition which is normal in C. contorta, 

 G. australiana, Trochodota purpurea ( = studeri), and Anapta 



