492 W. WILLIAMSON AND C. D. SOAR ON BRITISH HYDKACARINA : 



The capitulum is rather elliptical in shape. Only the anterior 

 half is visible, the posterior half being concealed behind the 

 epimera. The two anterior processes are long, tapering to a 

 sharp point. In situ they are directed towards the posterior- 

 dorsal surface, but have very little tendency to spread apart 

 laterally. The posterior processes are very much shorter, but 

 similar in shape. Their direction, however, is straight into the 

 body, so that they partially enclose the pharynx. The pharynx 

 itself is fairly wide and thick and increases in size gradually 

 towards the posterior extremity. The mandibles are long and 

 slender, extending well beyond the posterior end of the pharynx, 

 and work in a furrow formed in the hinder wall of the capitulum. 

 The claws are very nearly straight and are weakly serrate. 

 Opposed to the claw is a laminar process which is nearly as long 

 as the claw. 



The palpi vary in length from 0-35 mm. to 0*40 mm. The 

 third segment is shorter than the second, and the second shorter 

 than the fourth. They are thinner than the first pair of legs 

 and are laterally compressed. The second segment has a long 

 finely pectinate bristle on its flexor surface, slightly back from 

 the distal end. On the inner side of the segment almost distal 

 and close up to the extensor surface there are, close together, two 

 bristles which very nearly attain the length of the third segment. 

 The third segment has five weakly pectinate bristles on its inner 

 surface. Of these, three very long ones are at the distal 

 extremity, the fourth is short and situated close to the extensor 

 surface and slightly behind the middle, the fifth is longer than 

 the fourth and a little in advance of it and rather more to the 

 inside. The three distal ones are generally about the length of 

 the fourth segment ; one of these is close to the flexor surface and 

 two close to the extensor surface, one being slightly in advance of 

 the other. 



The fourth segment has only one small pore and rudimentary 

 hair in the distal third of the flexor surface. The extensor surface 

 has five or six fine short hairs of which three are distal, one about 

 midway and the others between. 



The posterior end of the first pair of epimera lies about midway 

 between the capitulum and the genital area. The posterior end 

 of the second pair is fairly broad. The suture between the 

 second and third pairs extends up about half-way to the gland 



