LITHOTRYA DORSALIS. 355 



Outer Maxillce, rather pointed, with the inner edge 

 slightly concave, continuously and thickly clothed with 

 short spines ; spines on the outer edge long ; there are 

 also some minute, short, thinly scattered spines or points 

 on the sides. Bristles on all the trophi doubly serrated. 



Cirri. — The first pair is placed at a small distance 

 from the second. The segments in the three posterior 

 pairs, support five pairs of very long spines, with a row of 

 (I believe) four small intermediate spines ; on the lateral 

 upper edges, there are some short blunt spines; anterior 

 faces of the segments not protuberant ; the dorsal tufts 

 consist of thick serrated, and of thin spines. The whole 

 integument is hirsute with minute pectinated scales. Two 

 or three of the basal segments in the sixth cirrus are 

 confluent. First cirrus, anterior ramus rather shorter and 

 thicker than the posterior ramus ; basal segments thickly 

 paved with serrated spines ; in the posterior ramus, the 

 six terminal segments are not paved with bristles. Second 

 cirrus has the seven basal segments of the anterior ramus 

 very broad, and paved with bristles ; the eight terminal 

 segments having the usual structure; in the posterior 

 ramus the three or four basal segments are similarly 

 paved, but to a very much less degree, and the remaining 

 thirteen have the usual structure. Third cirrus has the 

 six basal segments of the anterior ramus very broad and 

 paved, and the fourteen terminal ones of the usual struc- 

 ture ; in the posterior ramus, the three or four basal seg- 

 ments are similarly paved, but to a very much less degree, 

 and the seventeen terminal ones have the usual structure. 

 The pedicel of the first cirrus has very few spines ; those 

 of the second and third cirrus are thickly and irregularly 

 clothed with spines ; and those of the three posterior pair 

 have a double row with intermediate small spines. On the 

 antero-lateral faces of the pedicels of the second, third, 

 and fourth pairs of cirri, there is an elongated white 

 swelling or shield. Moreover, on the posterior thoracic 

 segments, there are similar white-coloured swellings, with 

 the membrane more plainly marked with scales than in 



