POLYNOIDAE 95 



ceratophore is a facial tubercle, and the back of the head is covered by a large nuchal 

 flap. The tentacular cirri are carried forward on each side so that they arise a little in 

 front of the head. Between their upper and lower ceratophores and on the inside there 

 is a small cirriform process enclosing an aciculum. 



Nearly all the elytra are lost. Such as remain are frayed at the edges and damaged. 

 They appear on the following segments: 2, 4, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 26, 29, 

 30, 32, 35, 38, 39, 40, 42, 43. The most complete fragment has only 42 chaetigers, so 

 that I cannot follow the arrangement in the more posterior region. I suspect that behind 

 the 42nd segment there are elytra on every segment. At any rate a hinder fragment from 

 St. WS 824 has elytrophores on all the segments. The elytra are large, thick, more or less 

 broadly oval, and have a gelatinous appearance. Under the microscope they have a 

 fibrous texture and are dotted with very minute three-pronged tubercles (Fig. 9 b). 



The feet (Fig. 9 c) are large and triangular. The dorsal ramus is much reduced and is 

 represented by a long projecting process, containing an aciculum, and a small bundle of 

 bristles arising from the anterior face of the neuropod. The ventral ramus is triangular 

 and the anterior lip is produced into a cirriform process inclosing an aciculum. In the 

 notopod the acicular process is postsetal and in the neuropod presetal. 



Dorsal bristles are absent from the first two chaetigers. The dorsal cirri are long and 

 extend well beyond the tips of the bristles : the ventral scarcely reach to the end of the 

 foot. From about the loth chaetiger backwards there is a white, glandular patch sur- 

 rounding the base of the ventral cirrus. Nephridial papillae are visible from the 6th 

 chaetiger. 



The dorsal bristles (Fig. 9 d) are long, smooth, very fine capillaries. The ventral 

 bristles are stouter than the dorsal. The uppermost ventral bristles (Fig. 9 e) are long, 

 slenderly lanceolate and towards the hair-like apex have faintly denticulated edges. 

 Below these and occupying most of the neuropod both above and below the acicular 

 process there are moderately stout bristles (Fig. 9/) with bidentate tips, and they have 

 along the blade a row of oblique pockets with plain edges. Between these two types of 

 ventral bristles there are one or two bristles more or less intermediate in type (Fig. 9 g). 

 Their general shape is like that of the upper lanceolate bristles but they carry rows of 

 pockets (Fig. 9 h) like the lower bidentate bristles. 



Remarks. I was at first inclined to regard these specimens as capable of inclusion 

 within H. magna, Moore, from Alaskan waters, but they show a number of diflFerences 

 which in my opinion justify the establishment of a new species. The arrangement of the 

 elytra in Moore's specimen and mine is similar up to the 32nd segment: Moore gives 

 elytra on 32, 33, 35, 36, 38, 39, 40, 41, etc.: I find them on 32, 35, 38, 39, 40, 42, 43. 

 Moore makes no mention of tubercles on the elytra; in these specimens there are 

 characteristic three-pronged tubercles. Moore states that the two types of ventral 

 bristle are separated in the foot by the aciculum ; in these specimens there are numerous 

 bristles of the bidentate type above as well as below the aciculum. Finally Moore states 

 that dorsal bristles are absent from the first three notopods; in these specimens they 

 are absent from the first two notopods. 



