LEODICID^E OF THE WEST INDIAN REGION. 127 



smaller on its proximal margin. There are about 30 pairs of these plates in each half of 

 the jaw, those near the end having the form shown in figure 466. Those of the inner 

 row are much like those near the base, except that their teeth are longer and more 

 slender. The outer-row plates become very long and slender and have about eight teeth. 



The mandible (text-figure 467) is of the usual form, the parts being heavier than in 

 S. vittata and with a variable number of denticulations along the anterior margins. 

 Beyond the apex of each half are several small plates. The number of these small 

 plates is apparently not constant in this genus, but the specimen examined showed 4 on 

 one side and 3 on the other; the latter, however, looked as if there had been a fusion of two. 



S. melanops did not appear in my Bermuda collections, and I am indebted to Dr. 

 Crozier, of the Bermuda Biological Station, for a single specimen collected in Fairyland 

 Creek. The specimen agreed with Yen-ill's diagnosis in most characters, differing in the 

 shape of the head as described above; in the fact that he described the dorsal cirri as 

 biarticulate, while this one had three articulations, and in the slightly greater number of 

 plates in the jaws. Verrill gave 20 as the number in the type, while my specimen had 

 as many as 30. 



