Br WfLLTAJI A. IIASWELL, M.A., 33. Sc. 635 



iVtlis. The thorax is composed of five segments ; the abdomen 

 of about forty. The body is stout, thickest in front, narrowing 

 somewhat behind. The head, including the lamina coronaria 

 (operculum^ Quatrefages), is rather longer than broad. The 

 opercular set^e are arranged in two long ovals ; the setae of the 

 outer limbs of the ovals are fifteen or sixteen in number on each 

 side, slightly curved, acute, bordered with two rows of prominent 

 spinules ; the seta? of the inner limbs are twelve or thirteen, 

 simple ; on each side, at the dorsal extremity of the rows are 

 either two or three stout brown setae, which are strongly hooked. 

 The prehensile cirri are extremely numerous and delicate, arising 

 from sixteen compressed lubes ; along the bases of the outer rows 

 of seta? is a series of eleven to thirteen lihort cirriform processes, 

 the two or three most dorsal of which are larger than the rest. 

 The mouth is surrounded by a raised rim. The first segment of 

 the thorax present« on either side of the mouth a triangular lobe, 

 and externally a short subconical cirrus, at the base of which is 

 a small bundle of setce. The second segment has a bundle of 

 neuropodial setic, similar to those of the first, but has no notc- 

 podium ; it presents a series of three cirriform processes on either 

 side. In the following three segments the notopodium is a broad 

 lamina armed with a row of seven or eii>-ht compressed, straij^rht, 

 blade-like setae and some minute setules. The abdominal para- 

 podia are likewise birainous, the neuropodia being minute 

 mammillae with about half a dozen setae, the notopodia transverse 

 ridges. 



A common species on Thursday Island, Torres Straits. 



As in Grube's ^ sexliamafa the hooks of the lamina coronaria 

 are sometimes two, sometimes three, often two on one side and 

 three on the other. 



Amphicteis foliata, sjh n. (Plate XII., figs. 12 — 14. 



The body is subcylindrical, but to some extent dorso-ventrally 

 compressed, broadest in front, tapering gradually behind, the 



