54 LEODICID.E OF THE WEST INDIAN REGION. 



The first parapodium (text-figure 164) has a small setal lobe and large cirri, the 

 dorsal asymmetrical lanceolate in form, the ventral rounded. A single acicula extends 

 into the setal lobe and there are needle aciculse in the dorsal cirrus. The tenth parapo- 

 dium (text-figure 165) has a lanceolate dorsal cirrus and a short conical ventral one, 

 carried on the end of a rounded swelling. The anterior lip is straight, the posterior 

 rounded, with a rounded end to the setal lobe. There are two aciculse in the setal 

 portion and needle aciculse in the dorsal cirrus. A parapodium, from posterior to the 

 middle of the body (text-figure 166), has a very slender dorsal cirrus, smaller than the gill, 

 while the ventral cirrus resembles that of the tenth. The anterior and posterior lips 

 and setal lobe are much as in the tenth. There are needle aciculse in the dorsal cirrus 

 and a ventral hooked acicula (not represented) farther forward. 



The nuchal cirri (plate 4, figure 12) are about half as long as the peristomium and, 

 like all other cirri, are colorless. There is one pair of rather large anal cirri. 



The compound seta (text-figure 167) has a basal portion expanded at the apex, its 

 convex margin being much denticulated. The terminal joint is relatively rather small 

 and is of the same size throughout the body, variations in length of the seta) being due 

 to differences in the basal portion. The simple seta? (text-figure 168) vary somewhat 

 in length, but all are curved gently toward the apex with a very narrow wing on either 

 margin. The pectinate setse (text-figure 169) have a narrow shaft, with about 20 very 

 fine teeth, of which the terminal ones are the largest. The dorsal acicula (text-figure 

 170) is light brown and tapers to a blunt point. The ventral one (text-figure 171) is 

 much darker, except at the extreme tip, and its apex is bifid rather than with an apical 

 and subapical tooth. It has a very small hood. 



The gills begin at about the sixteenth somite as a single filament, which is at first 

 very short, but later becomes much longer (text-figure 166). In small individuals 

 there is but one filament, but in larger ones there may be as many as three. They are 

 absent from approximately the last 25 somites. 



The maxilla (text-figure 172) is a dark sepia in color with, usually, the margins 

 darker than the interior. The carrier is small and rather slender, the forceps rather 

 heavy. Each proximal paired plate has 4 teeth, the unpaired has 5, the right paired has 

 6, the left paired has 2 large and 1 small one. The accessory plates are nearly square 

 and there are pigment patches distal to the plates. The mandibles have slender shafts 

 which are widely separated, the beveled portion with concentric lines which are darkest 

 at their ends. Each has a colorless expansion on its anterior border (text-figure 173). 



Type in the American Museum of Natural History. 



Leodice bucciensis, new species. 



(Text-figures 174 to 183.) 



A single broken specimen collected at Buccoo Reef in Tobago in March 1918. 

 No others appeared in later collections from this locality, and no drawings of the living 

 animal were made. It seems best, however, to describe this individual and to give it 

 provisionally the above specific name. 



The animal was in three pieces, together measuring about 70 mm. in length, with 

 a prostomial width of about 2 mm. and approximately 235 somites in the body. The 

 prostomium is a little wider than the peristomium and is deeply incised. The dorsal 

 surface is a reddish brown with numerous yellow spots and is very iridescent. The 

 tentacles have a short basal ring which is greenish, but their greater part is colorless. 

 This color is continued onto the whole anterior region of the body, but gradually lightens, 

 the posterior region having a distinct yellowish tint. 



The peristomium is a little longer than broad, as long as the following three somites. 

 The body reaches its greatest width at about the fifteenth somite and slowly narrows 



