1863.1 ^^- BAIRD ON NEW SPECIES OF WORMS. 109 



6. Nereis bicanaliculata, Baird. 



This is rather a small species, about 2 inches long, and 2^ lines in 

 breadth. It is of a dull white colour, and is remarkable for having 

 a channel running down both the dorsal and ventral sides. The 

 channel on the dorsal surface is rather deep, commencing from the 

 eleventh ring, and continues to the tail ; the channel itself is quite 

 smooth, the divisions or rings of the body not showing on its surface. 

 On the ventral surface the channel shows marks of the divisions or 

 rings into which the body is divided. The head is small, the an- 

 tennae about equal in length to the palpi, and the tentacular cirrhi 

 are equal to about five or six rings of the body. The upper portion 

 of the body is rounded, and not channeled ; and the tail terminates in 

 a round, blunt knob, without caudal filaments. The feet are rather 

 small, but are rendered unusually distinct from the peculiar manner 

 in which the rings or divisions of the body are interrupted by the 

 channel running along the centre of the body. It tapers very gra- 

 dually, and almost imperceptibly for some time, from the head to the 

 tail. 



Sab. Esquimau Harbour, Vancouver Island (Mus. Brit.). 



7. Glycera corrugata, Baird. 



This Annelida is about 4 inches in length, exclusive of the pro- 

 boscis, which, when exserted, is |ths of an inch long, and is about 

 3 lines in breadth ; the proboscis is 4 lines at its greatest diameter. 

 The head is rather short and conical, and strongly ringed. The an- 

 tennae are somewhat broad. The feet are broad, composed of two 

 lobes, and are destitute of branchial filaments. The bristles are 

 jointed, and the setae straight and sharp. The segments of the body 

 are very numerous, composed of a double ring, the one on which the 

 feet are set being the narrower of the two and raised ; while the 

 whole surface of the body, especially on the upper side, is densely, 

 though not very strongly, corrugated throughout its whole length. 

 The proboscis is densely scabrous, and covered with very short dark- 

 coloured bristles. The body tapers to a narrow point posteriorly, 

 and terminates in a loosely connected short lobe, armed at the extre- 

 mity with a slightly curved, horny, sharp-pointed claw. 



Hab. Esquimau Harbour, Vancouver Island (Mus. Brit.). 



8. Sabellaria saxicava, Baird. 



This Worm hves in the rock. The tube in which it lodges is 

 solitary, and is evidently hollowed out of the solid (though not a very 

 hard) rock by itself, and appears to be quite round. 



The thoracic portion of the body is round ; the abdominal flat- 

 tened, with an impressed line running down through its whole length. 

 The head is surmounted by an opercular disk composed of two rows 

 of stout, dissimilar bristles (paleee). The inner row consists of about 

 ten stout, cylindrical, sharp-pointed bristles of a dark horn-colour, 

 gradually increasing in size from the dorsal margin towards the ven- 

 tral. The outer row consists of about eighteen bristles, not so stout, 

 flattened, and finely denticulated on both sides for about half the 



