loo DISCOVERY REPORTS 



from Callao. From this E. patagonica differs in the ornamentation of the elytra, in the 

 possession of two or three lanceolate bristles in the neuropod and in several further 

 characters. Seidler's species was based on an anterior fragment, and he attributed the 

 lack of ornamentation on the ventral bristles to loss from wear. The study of the present 

 specimen leads me to the conclusion that this was not so, and that there exists a group 

 of branchiate lepidonotid Polynoidae with pseudo-elytra and smooth ventral bristles. 



Genus Macellicephala, Mcintosh 

 Body rather stout. Between 17 and 29 chaetigers. Prostomium bilobed, usually with 

 well-developed prostomial peaks. There are no lateral tentacles. 8-13 pairs of elytra. 

 Feet biramous with the dorsal ramus much reduced. Dorsal bristles absent or present 

 in small numbers. They may be spinous or smooth. Ventral bristles long, delicate and 

 transparent. 



Macellicephala mirabilis, Mcintosh. 



Mcintosh, 1885, p. 121, pi. xvi, fig. i; pi. xHa, figs. 9-11. 

 Macellicephala sp., Monro, 1930, p. 47, fig. 10 a-b. 

 Macellicephala mirabilis, Augener, 1932 b, p. 102. 



Occurrence. St. 144 (i). 



Specific characters. A small species with 17-18 chaetigers and a length of 20- 

 25 mm. The colour is pink to purple on the back. There are no eyes. The head is 

 markedly bilobed. There are nine pairs of elytra. The dorsal ramus has a few bristles 

 that are either smooth or show just a trace of serration towards the tip. The ventral 

 bristles are long and transparent and lightly serrated on one side only. 



Remarks. The present specimen is from the same haul as the Macellicephala re- 

 corded by me in my previous Discovery report. It is in a slightly better state of pre- 

 servation than the latter and dorsal bristles are present in a number of the feet. Mcintosh 

 and Augener state that they are smooth : under a high magnification I can see some very 

 fine serrations towards the tip. 



Genus Eucranta, Malmgren 



As Harmothoe, except that the upper ventral bristles are of a special kind, being long 



and slender, with rows of pectinae and minutely bifid tips. 



Middle ventral bristles bidentate Eucranta mollis 



Middle ventral bristles unidentate Eucranta villosa, var. notialis 



Eucranta mollis (Mcintosh). 



Eupolynoe ?nollis, Mcintosh, 1879, p. 259, pi. xv, figs. 5-9. 

 Eucranta mollis, Bergstrom, 1916, p. 294. 

 Monro, 1930, p. 51. 



Occurrence. St. 363 (i); WS 211 (i); WS 871 (i). 



Specific characters. The head is round and the lateral tentacles are inserted 

 ventrally. The prostomial peaks are represented by two minute papillae lying above the 

 large, round anterior eyes. The hinder pair of eyes lies at the back of the head. The 



