1906.] NATURAL SCIENCES OF PHILADELPHIA. 231 



mens, even where longest (in the middle of the body), they barely 

 equal one-half or one-third of the body diameter. Toward the ends 

 they are reduced to one- third or even one-foiu-th of this length. 



Lateral sense organs appear as a pair between the prostomium and 

 peristomium and occur between the setae tufts of every succeeding 

 segment, except that they are occasionally absent from XXXI or 

 XXXII, In shape they are elleptical with the long axis vertical. 

 Ventral sensory pits appear on IV and continue without exception to 

 XV in the position indicated above. At fu'st very small, they increase 

 rapidly until they exceed the lateral organs, unlike which they are 

 always circular. 



Small notopodial and neuropodial tufts of setae occur on all somites 

 from II caudad at the junction of the second and third rings. Both 

 tufts are retractile into pits and the notopodial setae are somewhat 

 longer than the neuropodial. All setae are very slender, flexible and 

 thread-like, of various lengths in each tuft, and have each margin 

 provided with a fringe of appressed hairs. 



Many of the specimens are enclosed in a very tough mucous mem- 

 brane more or less coated with silt, and often inliabited by small 

 nematodes. 



This species bears much resemblance to Travisia olens Ehlers, which 

 has only thirty segments and rather distinct parapodial papillae. 



It is apparently an abundant worm, conspicuous from its large size, 

 and widespread on muddy bottoms. Specimens were collected from 

 the following stations: 4,192, Gulf of Georgia, 18 to 23 fathoms, green 

 mud and fine sand; 4,194, Gulf of Georgia (tj^e locality), 111 to 170 

 fathoms, soft green mud; 4,197, Gulf of Georgia, 31 to 90 fathoms, 

 sticky green mud and fine sand; 4,230, Behm Canal, 108 to 240 fathoms, 

 rocky; 4,235, Behm Canal, 130 to 193 fathoms, gray mud; 4,237, Behm 

 Canal, 192 fathoms, green mud; 4,246, Kasaan Bay, Prince of Wales 

 Island, 101 to 123 fathoms, gray and green mud, coarse sand and 

 shells. 



Brada pilosa sp. nov. Plate X, figs. 14-17. 



This well-marked species is represented by about a dozen specimens 

 varying in length from 15 to 30 mm., the largest having a maximum 

 diameter of 5 mm. With the prostomium and tentacles retracted, 

 which is the condition of all of the specimens, the form of the body is 

 slender clavate, bluntly rounded at the anterior end and gradually 

 thickening to a])out XI or XII, from which point it tapers into the 

 rather slender, gracefully formed caudal region. 



