34 LEODICID.E OF THE WEST INDIAN REGION. 



leaf-like, the other much longer and, due to imperfect preservation, much flattened. 

 In it could be seen a definite jointing, though not a moniliform structure. If the 

 Tortugas specimen were L. floridana, parts of the tube would probably have been 

 dredged with the animal, but no trace of it appeared. I have thought it best to record 

 what is possible of its structure in the hope that later collecting may furnish material on 

 which to determine its exact position. 



A middle parapodium of the fragment (text-figure 77) shows a long dorsal cirrus 

 (in which I could find no trace of articulations) and the ventral cirrus of the form most 

 common in the fragment. The posterior lip of the setal lobe is only a little more promi- 

 nent than the anterior, and there are two very dark, straight aciculse and one ventral 

 hooked one. All aciculse are very dark-colored and prominent, though slightly smaller 

 in my Tortugas material than in the Albatross specimens. Like L. longicirrata, there is 

 a dark-brown spot near the base of the dorsal cirrus, but this is lighter than in' longi- 

 cirrata, and is accompanied by a ventral one, not represented in that species. At the 

 posterior end all cirri are long and prominent, the dorsal ones as long as in earlier somites, 

 the ventral ones very slender. 



The simple setse (text-figure 78) are very long and slender, slightly expanded toward 

 the apex and sharp-pointed. Along one edge the expanded portion is very finely dentic- 

 ulated, a feature which shows only under high power (text-figure 79). The compound 

 setse are large, with heavy bases slightly broadened toward the end, and with plainly 

 marked denticulations along one edge (text-figure 80). Each terminal joint is relatively 

 very small, has an apical and a subapical tooth, and is covered by a small denticulated 

 hood. The pectinate setae (text-figure 81) have about 15 teeth, the terminal tooth at 

 one end being slightly longer than at the other. The dorsal acicula (text-figure 82) is 

 dark to the very end, having only a very narrow marginal lighter band. The ventral one 

 (text-figure 83) has a much broader marginal light band, is bifid, with the subterminal 

 tooth a little the larger, and a rather small hood. 



The pygidium retained but one anal cirrus (text-figure 84), which had 7 joints. 



The gills are always shorter than the dorsal cirrus and rather heavy. I found none 

 with more than 4 filaments (text-figure 77). The number gradually decreases toward 

 the posterior end, the last ones having only a single filament. 



Leodice rubrivittata, new species. 



(Plate 1, figure 18; text-figures 85 to 94.) 



A small species with approximately 150 somites and a body length of 80 mm. The 

 prostomial diameter is about 0.5 mm., but at its widest part the body diameter may 

 be 2 mm. 



The most noticeable feature of the living animal is the arrangement of pigment. 

 On the prostomium are two reddish-brown or orange pigment patches extending from 

 the median line just inside the eyes to the antero-lateral border. On the posterior border 

 of the prostomium are other patches partly covered by the peristomial margin. On the 

 dorsal surface of the peristomium is a single pair of pigment patches, on the dorsal 

 surface of the second somite are four, and this structure is repeated in the somites 

 immediately following, but in later somites the patches unite to form a continuous 

 transverse band. These are usually orange-colored in the anterior somites and reddish- 

 brown farther back. Behind somite 40 the pigment is in the form of faint dots in the 

 mid-dorsal line and on the parapodia, while behind the region of somite 50 they disappear 

 entirely and the whole body is a pearly white with a dark spot at the base of each para- 

 podium. The pigment is retained in preserved material. 



The prostomium (plate 1, figure 18) is only very faintly bilobed, the median cleft 

 being almost invisible from above. The tentacles are long, the median reaching as far 



