ALEPAS CORNUTA. 167 



extraordinarily numerous. In the three posterior cirri 

 (excepting the rudimentary rami), each segment sup- 

 ports two long, slightly serrated spines, with two or three 

 minute intermediate ones, and with one or two very 

 short, thick spines on the inner and upper lateral margins : 

 dorsal tufts with only two or three long, fine, unequal 

 spines. All the segments are extremely flat, broad, short, 

 with their anterior faces not protuberant ; the greater 

 number of the segments, especially the lower ones, have 

 very obscure articulations, to be seen only with a high 

 power, and these can be capable of little or no movement. 



First Cirrus placed far from the second, with the top 

 of its pedicel on a level with the top of the lower seg- 

 ment of the pedicel of the second cirrus ; rami short, 

 barely half the length of those of the second cirrus ; 

 unequal, the anterior ramus being only two thirds of the 

 length of the posterior one ; the shorter ramus contains 

 thirteen inverted-conical segments, with one side rather 

 protuberant; the longer ramus contains twenty-three 

 thinner segments ; the segments on both rami are clothed 

 with bristles, arranged in two or three rows, forming 

 narrow transverse brushes. 



Second Cirrus, with its pedicel long, and its rami nearly 

 equalling in length those of the sixth pair ; the two rami 

 of nearly equal length ; the anterior one rather thicker 

 than the posterior one ; this posterior ramus has fifty-five 

 segments ! The bristles on the second and third cirri 

 are arranged on the same principle as on the three 

 posterior pair ; but from an increase in size and number 

 of the little intermediate bristles between the main pairs, 

 and of those on the lateral rims, the segments, especially 

 the basal ones, of the anterior ramus of the second cirrus, 

 are clothed with thin brushes of bristles ; these same 

 bristles, on the posterior ramus of the second, and on both 

 rami of the third cirrus, can hardly be said to form 

 brushes, though longer and more numerous than those 

 on the three posterior pair of cirri. 



Fifth and Sixth Cirri. — These resemble each other, 



