Gatty Marine Laboratory, St. Andrews. 543 



the dorsal lobe are longer than those of the ventral. The 

 ventral bristles are distinguished by their greater diameter, 

 stiffness, and slightly deeper yellow as transparent objects. 

 Their transverse articulations are much closer proximally 

 than distally, and the tip is very slender. This may be a 

 well-marked variety of the former. 



Another member of the family is Brada granulata, Malm- 

 greu, from Finmark in 1890. This differs from B. villosa in 

 its shorter form in proportion to its breadth, in the less 

 developed bristles, the absence of the ventral papillae, and in 

 the apparent absence of sand-grains, though under a micro- 

 scope minute grains are numerous. The body is somewhat 

 fusiform, rather blunt at each end, especially anteriorly, the 

 segments clearly outlined and dotted all over with pustule- 

 like papillae, the ventral not evidently differing from 

 the dorsal surface in this respect. Segments 24, the first 

 having the trifid pit anteriorly and the last a vertical 

 fissure for the vent. The dorsal bristles are only visible after 

 minute inspection, and they are pale, slender, and capillary, 

 few in number, and with long joints. The first series is 

 inconspicuous. On the other hand, the ventral division has 

 a distinct setigerous process surrounded by a rosette of from 

 seven to eight or more of the pustule-like papillae. The 

 ventral bristles are long and strong, minutely striated trans- 

 versely, of a deep brownish colour, and ending in a pale 

 yellow tip with a long curve and a hook-like curvature at the 

 tip (PI. XII. a. fig. 9). 



Brada normani. 



A form (PI. XII. fig. 4) having the outline of Brada 

 granulata with the anterior pit terminal and of a triradiate 

 form, and with nearly the same number of segments, 

 viz. 24, differs from it in having a surface quite as rough 

 as in B. villosa — that is, covered with coarse sandy papillae. 

 Posteriorly a dimple which extends to both dorsal and ventral 

 edges has the anus in its middle. The papillae along the 

 line of the dorsal bristles are large, long, flattened, and 

 conical, with an acute tip (PI. XII. fig. 5), and therefore 

 of a type quite different from the papillae usually seen in 

 Stylarioides, Brada villosa, or B. granulata. They have an 

 opaque granular and fibrous core, and it tapers in consonance 

 with the outline of the process and ends in a median terminal 

 strand which passes to the narrow and hollow as well as 

 differentiated tip of the organ. Other and smaller twigs 

 appear to branch into the hypoderm at the base of the narrow 



