BY WILLIAM A. IIASWELL, M.A, B.SC. 279 



This species is placed by Quatrefages in his second "tribe " of 

 Polij7ioc, characterised by having the middle of the back not 

 covered by the elytra. He makes the following additional 

 remarks on the species : — '' This species is 32-33 mm. in length. 

 Its head is small, nearly square. The median antennae, long and 

 nearly cylindrical above the basilar portion, is nearly twice as long 

 as the lateral. Both are dilated near the apex. The inferior 

 tentacles are very thick, longer than the median antenna, and 

 simply conical, without terminal dilatation. The body only 

 contains 26 segments, the last being quite rudimentary. The 

 posterior extremity bears four elongated cirri, similar to the 

 median antenna, and proceeding from the two last segments. 

 The other segments of the body are thick and broad. The 2 — 3 

 first are entirely covered by the elytra which then become 

 separated behind on the middle of the back, which is naked in all 

 its median portion. It ought to be nearly the same behind to 

 judge from the size of the elytra which remain in the two 

 specimens that I have examined. These elytra are rounded, a 

 little oblong. Their surface is covered in part with small tubercles 

 which are elongated now and then in front into cylindrical 

 mammillae. There is no trace of fimbriae." 



"The feet are short and thick; the setiferous mammillae very 

 distinct. The notopodium bears a bundle of numerous, long, 

 curved, smooth, light coloured setae, directed outwards. Tlfe 

 neuropodium has a bundle of less numerous, straight, strong, 

 blackish-brown setae, of which the extremity is expanded into a 

 curved spatula with strongly denticulated borders and a simple, 

 straight point. The dorsal cirrus is longer than the feet. It is 

 dilated like the antennae near its extremity. The ventral cirrus, 

 which is very short but thick, is placed near the middle of the 



A sj)ecies extremely common between tide-marks in Port 

 Jackson is probably the same as that above described. 

 S 



