626 A. JE. Verrill — Ttcrbellaria, Nemertina, and 



Color, in formalin, light green, with indication of a broad, darker 

 greenish band across each segment ; in one specimen there is a pale 

 line between the segments and a row of darker roundish spots with 

 pale centers along each side ; the gills were apparently dark green. 

 The color in life was not noted. 



Rare, only three specimens seen, none perfect. 



It is closely related to B. oculata Ehlers, from Florida, described 

 from a single small, imperfect specimen, but the latter has smaller 

 and shorter simple gills, and a differently shaped head. 



Desmosyllis longisetosa, sp. nov. (See p. 635.) 



A small, slender, 6-eyed species Avith long, well-beaded antennae 

 and dorsal cirri ; setse of two kinds, compound and simple ; the 

 upper anterior have long, slender, acute blades. 



Head broader than long, widest in front of middle, with the pos- 

 terior border emarginate and the front with a medial lobe. Palpi 

 short and broad, oblong ovate, united for about ^ their length, wider 

 than the head and about as long. The four larger eyes are black 

 and conspicuous, though small, the anterior are a little larger and 

 much farther apart, though only a little farther forward ; the third 

 pair are minute, situated at the bases of the antennae. The tentacle 

 is large and long, 5 or 6 times as long as the head, composed of about 

 28 annuli, of which 23 are beyond the ends of the palpi; the annuli 

 are mostly about 1^ times wider than long, but the distal ones are 

 about as long as broad, elliptical, with deep constrictions between. 



The antennae are similar and nearly as stout as the tentacle and 

 about f as long, with about 24 beads. The upper tentacular cirri 

 are like the tentacle and longer, projecting forward nearly as far ; 

 the lower ones are about half as long. The dorsal cirri are all long 

 and strongly beaded, but those of the first 10 segments are particu- 

 larly long, some of them being nearly twice the length of the upper 

 tentacular cirri and 5 or more times as long as the diameter of the 

 body, with about 38 annuli ; those left near the posterior end are 

 about 4 times the diameter of the corresponding segment, but most 

 are lost posteriorl3^ 



Ventral cirri slender, tapei'ed, nearly as long as the setigerous 

 lobes. Setae are numerous and long ; those of the anterior fascicles 

 have the free part longer than half the diameter of the body ; the 

 posterior are equal to the breadth of the corresponding segments ; 

 the upper anterior setae have long, narrow, straight blades, 8-10 times 

 as long as wide, with the tij) incurved and faintly bidentate ; the 



