128 CHARLES D. SOAR AND W. WILLIAMSON ON 



bridge forms a well-marked cone-shaped process. There are 

 a few irregularly shaped protuberances, which serve for muscle 

 attachment. 



The palpi are about I'li mm. in length, and thinner than the 

 first pair of legs. The second segment is stouter than the others, 

 and has the distal end well developed and fringed with about twelve 

 bristles, of which part are pectinate. The third segment is more 

 slender, having a low, rounded protuberance on its flexor surface 

 with a group of long, slender bristles of which about five are 

 pectinate. The fourth segment is more slender than the third, 

 and more than twice as long; except for its slightly thicker 

 proximal end it is of nearly equal thickness throughout. There is 

 an inner row of ten long, smooth bristles terminating distally 

 in a group of four similar bristles and two or three short, stout 

 pectinate ones. There is further an outer row of three pectinate 

 bristles, and eight or nine short, smooth ones arranged irregularly. 

 The fifth segment is relatively long, with a row of short spines 

 on its flexor surface. 



The capitulum is small, compared with the size of the epimera. 

 Its breadth at the anterior end, where it is marked by a broad, 

 deep median cleft, is about equal to its entire length. The antero- 

 lateral corners are somewhat pointed. The lateral margins 

 curve inwards towards the posterior, so that the margin there is 

 about half that of the anterior end. The anterior processes are 

 slender, spreading out to near the base of the short and stout 

 posterior processes, which are not thickened at their extremity. 

 The maxillary plate is for the most part coarsely perforate. The 

 pharynx is relatively narrow, and is slightly contracted in front 

 of the narrow pharyngeal ridge. The metapharynx is rather 

 long, and is narrower than the pharynx itself. The air sacs are 

 short and thin. 



The margins of the epimera are strong and broad. All of the 

 pairs are of approximately equal width, and long in proportion, 

 though the third pair scarcely extends beyond the others. The 

 subcutaneous processes at the inner ends are small and coarsely 

 granulate. 



The legs range from about 2-67 mm. in the first pair to about 

 3-57 mm. in the fourth pair. Relatively, the swimming hairs 

 are short. 



