LEODICID^E OF THE WEST INDIAN REGION. 49 



showing a broad white plate with only a slight notch in the middle line of the cutting- 

 edge. The species may often be recognized by this mandible, which, when protruded, 

 looks like a white linen cuff stuck into the mouth-opening. 



I have identified this as Grube's species, though from his imperfect description it 

 is not possible to be certain. Renewed examination of the specimen described as E. 

 siciliensis by me in 1900 shows that this Porto Rico specimen is caribcea. Grube's 

 specimen came from St. Croix, Christiansted. I found a few in Bermuda, and it is 

 fairly common in Tobago in Montego Bay, Jamaica, and at the Dry Tortugas. In 

 Tobago there were two varieties, one much larger than the other and of a pink color in 

 the egg-bearing somites; the smaller variety was green where filled with eggs. I was, 

 however, unable to determine any other differences in the details of jaw, parapodia, and 

 setal structure. 



L. caribcea occurs in the crevices of the worn coral rock, the anterior end usually 

 bent and twisted in a most complex fashion through the spaces in the rock. This makes 

 it a difficult form to collect without breaking. 



Leodice culebra Treadwell. 



(Plate 2, figures 13 to 16; text-figures 144 to 153.) 

 Eunice culebra Treadwell, 1901, p. 197, figure 37. 



A small species, approximately 150 mm. in length and containing not more than 

 150 somites. 



The anterior end of the body is colorless, except for the tint given it by the contained 

 blood, and is very iridescent. The posterior two-thirds (plate 2, figure 13) is in life a 

 noticeable green, which turns to a dark brown in alcohol. 



The prostomium (plate 2, figure 14) is very noticeably four-lobed and is wider than 

 the peristomium. The eyes are small but distinct. The tentacles are slender, not much 

 tapered, the median reaching to the third somite. The inner lateral ones are a little 

 shorter than the median and the outer lateral a little shorter than the inner. The peri- 

 stomium (plate 2, figure 14) is nearly rectangular in outline, as long as the following 

 three somites. The nuchal cirri are short, not reaching to the middle of the peristomium. 

 There is very little tapering of the body toward the posterior end, what narrowing there 

 is being confined to the extreme end. There is one pair of stout anal cirri (plate 2, 

 figure 10). 



The first parapodium (text-figure 144) has a very heavy ventral cirrus, the dorsal 

 cirrus being about twice as long as the ventral and about half as thick. The setal portion 

 has a ventro-posterior lobe, the acicula coming to the surface just dorsal to this. The 

 tenth parapodium (text-figure 145) is very much larger than the first, the difference 

 being mainly in the increase in size of the setigerous portion. The dorsal cirrus is slen- 

 der and the ventral cirrus is a blunt cone carried on the end of a rounded pad. In a 

 posterior parapodium (text-figure 146) the cirri are both very small, while the setal 

 portion has a rounded posterior lip longer than the anterior. The gill-filament is larger 

 than the dorsal cirrus. The gills are in the form of single filaments, but their distribu- 

 tion is very irregular. One individual had gills on somites 25 to 32 and no more until 

 about somite 100, and from here they continued for about 50 somites. Others showed 

 an arrangement much like this, but many gills had apparently been lost. In general, 

 the gills are more regular in their distribution and more prominent in the posterior than 

 in the anterior gill-bearing somites. The characteristic form is a single finger-shaped 

 filament (text-figure 146), but in one case a single bifid gill was seen. 



The simple seta (text-figure 147) is long, slightly enlarged, and bent at the apex 

 without marginal winging. The compound setae (text-figure 148) have fine denticula- 



