ON THE OVIPAROUS SPECIES OF ONYCHOPHORA. 405 



papillae are scattered in the dark areas, and dark ones in 

 the light areas, the papiUiTe being arranged as usual on 

 transverse ridges of the skin. Sometimes the light-coloured 

 primary papillae appear to be arranged to some extent in 

 irregular longitudinal rows, and sometimes the chessboard 

 pattern is almost obliterated, leaving the longitudinal rows of 

 light-coloured papillas scattered over a nearly uniform back- 

 ground. The dorsal surface of the legs and feet is dark 

 indigo-blue, with two or three orange or yellow papillae on 

 the legs. 



The ground colour of the ventral surface is pale yellowish. 

 Over this are scattered a number of papilla?, mostly of an 

 indigo-blue colour, but some dull orange, arranged in trans- 

 verse rows on the ridges of the skin. In the mid- ventral 

 line, between the legs of each pair except the last (where the 

 genital aperture is situated), are the usual pale areas of skin 

 devoid of papillae. 



The antennee are dark indigo-blue, sometimes ringed with 

 orange. The characteristic chessboard pattern of the dorsal 

 surface appears to be very constant, and I have seen it in 

 Tasmanian as well as in Victorian specimens. 



I have no measurements of living specimens, and the 

 females in my possession do not appear to be fully grown. 

 After preservation in spirit in the ordinary manner, my 

 largest male specimen (Tasmanian) measures about 11 mm 

 in length by 2*5 mm. in greatest breadth, exclusive of appen- 

 dages. The specimens collected by Professor Spencer in 

 Tasmania were killed by drowning, and therefore presumably 

 in an extended condition, and he gives the measurements of 

 three of the largest as respectively 23, 1 7,and 15 mm. in length 

 (exclusive of tentacles), and 4, 3, and 3 mm. in breadth. It is 

 possible, as has been suggested, that the Tasmanian specimens 

 may be normally larger than those of the mainland, but the 

 evidence is not sufficient to enable us to form a definite 

 conclusion on this point. The three Tasmanian specimens in 

 my possession are all male, and I have a male specimen from 

 Victoria of about the same size. Probably the females are a 



VOL. 45, PART 3. — NEW SEKIES. EE 



