POLYCH^TA FROM NORTH AMERICA. 787 



and one from Dodcis ISTarrows. Depth 15 to 25 fathoms. Tubes 

 generally solitary, attached to stones, shells, old wood, etc. Only 

 one specimen is recorded by Bush from Junean. Tubes much 

 coiled, with flaring ends and one or two other conspicuous ridges 

 at intervals indicating the flaring end of a younger tube. Young 

 tubes seem to develop with a centimetre or so attached more 

 or less straight along the substratum, then to coil indifierently 

 to right or left, and only at a much later stage, if at all, to ascend 

 and form the flaring end. 



General colour pale orange, the branchiae and operculum 

 variously mottled and barred with red. Pinnae sometimes 

 golden ; ova greenish. Length varies from about 14 mm. to 

 50 mm. (fig. 3). 



Largest diameter of operculum 1-3 to 4*5 mm. ; the latter had 

 32 radii forming a thick scalloped edge. The pedicle was bifid 

 and contracted at the top just before joining the basal processes 

 of the operculum (fig. 3). Setse as figured by Bush (3) ; in the 

 posterior region of the abdomen the ordinary setae are replaced 

 by small fascicles of long slender spines. 



Genus Apomatus Philippi (21), 1844. 



Generic characteristics : — 



1. Operculum globular, terminating a gill retaining its pinnae. 



2. Some thoracic setae bladed sickles (setae of Apomatics) 



(fig. 4 c). 



3. Terminal dorsal gland present. 



4. Apomatus timsii, sp. n. (PL LXXXYII. figs. 4«-4/.) 

 Specific characteristics : — 



1. Collar setae simple tapered blades (fig. 4 h). 



2. Branchiae about 40 pairs with pinnae nearly to the ends of 



rachises. 



3. LTncinigerous tori begin on third setigerous segment. 



4. Uncini with numerous small teeth, the posterior one larger 



with terminal enlargement (fig. 4 /). 



5. Abdominal setae more or less sickle-shaped with some long 



filiform ones in the last segments. 



Eleven specimens from the Channel outside Departure Bay in 

 about 20 fathoms. This is the first time apparently that the 

 genus has been recorded from the Pacific Coast of America. 



The tubes are solitary, adherent, and sinuous — one was attached 

 along its whole length to a jDortion of the Hexactinellid sponge 

 Aphrocall iste-3 lohiteavesUonus. 



When full-grown about 80 mm. with 150 abdominal segments 

 (fig. 4«). 



The branchial rachises are much coiled and almost colourless, 

 with pairs of red spots up their outer surfaces and only short- 

 filiform extremities — the pinnae appear green due to the contained 

 blood. The thorax is more or less orano-e or red, the thickened 



