358 DK. BAIBD ON SEVERAL GENERA OP EUNICEA. 



tinations or teeth rather nuraerous, all on the same plane and 

 equal iu size ; they vary in number, there being sometimes as 

 many as ten in one fascicle. No compound setse. Aciculse or 

 spines two to each foot on the middle or lower part of the body 

 only, straight and very sharp-pointed. These spines are not round 

 like those in the Eunicida), but are flat and more like simple setae, 

 taking the place of aciculse. Uncini or booklets generally two in 

 number, a little shorter than the aciculae, more cylindrical, and 

 forcijDate or bideutate at the apes. 



Sp. 2. Htalin(ecia bilineata, Baird. 



Animal slender and narrow, gradually diminishing in size 

 towards the tail, convex dorsally, and marked with two longitu- 

 dinal reddish-coloured lines, which run throughout the whole 

 length, one on each side. A small dark-red spot occurs between 

 each foot. The organs attached to tlie head, antennules, tenta- 

 cle, antennae, and palpi, are very similar to those of tiibicola ; and 

 the feet are furnished with only the same kinds of seta? as iu 

 that species. The simple setae, however, are linear-lanceolate, not 

 limbate or broadly lanceolate in the upper third as in tuhicola. 

 Dorsal and ventral cirri occur on the two upper thirds of the 

 body. 



These setae and cirri vary considerably according to their situa- 

 tion. In the anterior pairs of feet there are no uncini or booklets ; 

 but instead of them are two setae very like the compound sctso of 

 Eunice, only the falciform appendage (which is bidentate near the 

 apex) is as it were soldered to the shaft and not moveable. To- 

 wards the middle of the body these compound-looking setae dis- 

 appear, and their place is taken by two regular forcipate uncini, 

 as in tubicola. The shaft, however, is much curved, and it is by 

 far the stoutest of all the setae of the feet. On the lower portion 

 of the body the simple seta3 are of two kinds — one, three or four iu 

 number, being straight, stout, and very sharp-pointed, more like 

 sharp-pointed aciculae than setae (are they aciculae ?), the others 

 of the usual form, linear-lanceolate, about half the size of the 

 others. 



The cirri appear to be three in number on the segments of the 

 upper third of the body. One of these is longer than the two 

 others, and may be considered the branchial filament. About tlie 

 middle third of the body this branchial filament disappears, oiiljf 

 the two cirri being present. On the lower third uf the body one 



