532 PROF. F. J. BELL ON eoLOTiiuRoiDS. [June 23, 



Atnphicyclus japonicus, but for the great length of the retractor 

 muscles ; though these prolonged bands have a tendinous appear- 

 ance, they are of the same histological structure as the more 

 obviously muscular part. 



CucuMARiA BicoLOR, sp. nov, (Plate XLV. fig. 2.) 



Body irregularly pentagonal, tapering slightly at its hinder end ; 

 no anal teeth ; disthictly marked off into ambidacral regions which 

 are quite white, and interambulacral regions which are chocolate or 

 black ; the ambulacra very wide, the suckers arranged irregularly, 

 but in more than two rows ; the bivial are narrower than the trivial 

 ambulacra ; the suckers are strictly confined to the ambulacra. 



The state of contraction is such as to make a complete description 

 of the internal anatomy impossible, but it may be noted that the 

 integument is thick, the calcareous oesophageal ring fairly well 

 developed, the interradial piece ending in a dagger-shaped process, 

 and the radial being about twice as wide as the iuterradial ; the 

 genital tubes are numerous. 



The spicules are few in number and small in size ; the spine of 

 the turriform bodies is bifurcated at its free end. 



Length 36 ; 2.5 millim. : greatest breadth 20; 12 millim. 



King Sound, W. Australia. 



This species seems to be most closely allied to C. versicolor^ from 

 which it differs in the absence of ambulacral papillae. 



CucuMARiA iNcoNSPicuA, sp. nov. (Plate XLV. fig. 3.) 



Small, stout, a little rough to the touch, with the suckers not 

 quite definitely limited to the ambulacra, though very often nearly 

 so ; the trivial suckers are in four and the bivial in two fairly regular 

 rows. No anal teeth. The pharyngeal ring large, the muscles 

 stout and inserted at once into the body-wall ; the ring appears to be 

 made up of fine sets of equal pieces, formed probably by the equal 

 radial and iuterradial calcifications ; the Polian vesicle is large. 



The genial tubes are long, simple, and not numerous. 



The spicules are rare, and are only in the form of large deposits 

 of the shape shown in Plate XLV. fig. 3. 



Colour varying shades of dark slate or brown. 



Average length 17 millim., average greatest breadth 6 millim. 



Port Phillip Heads. Collected by J. B. Wilson, Esq. 



The irregularity of the arrangement of the suckers of this species 

 appears to afford a strong argument against the division of the genus 

 Cucvmaria into Cucumaria s. str. aud Semperia, which has been 

 proposed by Lampert. 



HOLOTHURIA (BoHADSCHIa) WHITMiBI, sp. DOV. (Plate XLV. 



fig. 4.) 



This is a large Holothuria with a stellate anus, and deposits not 

 irregular rosettes, but stout basket-like knobbed bodies. 



The body is flattened (in spirit) ; no dorsal papillae or suckers ; 

 the ventral surface is thickly packed with suckers. Mouth ventral 



