LEODICID^ OF THE WEST INDIAN REGION. 41 



The peristomium (plate 1, figure 15) is three times as long as the prostomium and 

 is nearly rectangular in dorsal view. The second somite is very short, its nuchal cirri 

 rather small, not reaching to the margin of the peristomium, and are colorless. Later 

 somites are a httle broader, but back of the middle of the body they become narrow, the 

 whole posterior region being very slender. There is one pair of long anal cirri (plate 1, 

 figure 17). 



The first parapodium has a well-developed setal lobe with a conical postsetal lip. 

 The dorsal cirrus has needle aciculse in its base, and a large acicula protrudes from the 

 setal portion. The tenth parapodium (text-figure 117) has a high setal portion with 

 pointed posterior lip and has several aciculae protruding from the apex of the setal 

 portion. The dorsal cirrus is long and slender with rather stout needle aciculse in its 

 base, while the ventral one is a rounded cone on the end of a globular swelling. A para- 

 podium from the middle of the body (text-figure 118) has a small posterior lip and two 

 acicula?, both dark in color and the ventral one bifid at the end (text-figure 119). The 

 dorsal cirrus is small, with a rather broad base, and has at the base a ventral swelling 

 which is evidently a sense-organ similar to that described in Eunice auriculata (Tread- 

 well, 1901, p. 197, figures 34, 35). Its terminal portion is slender and short. The long, 

 narrow gill-filaments arise from the base of the cirrus. The ventral cirrus is similar to 

 those in the anterior parapodia, but smaller. In the specimen drawn, the ventral cirrus 

 had been bent under the setal portion and is not well shown. The posterior parapodia 

 (text-figure 120), drawn to a larger scale than the others, have a rounder anterior and 

 a pointed posterior lip and two prominent aciculae. The dorsal cirrus is long and slender, 

 the ventral much shorter, but not on a globular base. 



The simple setse (text-figure 121) are long and slender, tapering to acute points 

 with a wing on either edge. Each compound setse (text-figure 122) has the apex of the 

 basal joint enlarged and striated, the distal joint being rather slender, with rounded 

 apical and subapical teeth covered by a hood. The margin of the hood is striated. 

 The pectinate setse (text-figure 123) have an unusually broad end with about fourteen 

 prominent teeth the terminal ones the largest. The dorsal aciculse (text-figure 124) 

 have bluntly pointed ends and very dark shafts, only the extreme tip being uncolored. 

 The ventral ones are similar to these in color, but have a forked (not toothed) apex 

 without a hood (text-figure 119). 



The gills begin in about the region of somite 30, at first as a single short filament, 

 but there is a rapid increase in length in succeeding somites, so that the tenth gill is more 

 than half as long as the diameter of the body. Between the fortieth and fiftieth somites 

 a second filament appears, and this number is continued throughout the greater part 

 of the remainder of the body (plate 1, figure 16; text-figure 118). 



The maxilla is brown in color (text-figure 125). The carrier is rather long, the for- 

 ceps rather slender, each half with a dark-colored depression near the base, and the 

 apex very dark. The promixal paired plates have each 4 large teeth, the basal portions 

 of the plates much lighter in color than the terminal. The distal paired plates have 

 9 teeth on the right, 3 large and 1 small on the left; the unpaired plate has 3 large 

 and 3 small. An accessory plate with an incurved corner Ues lateral to the plates and 

 there are light-brown crescentic patches distal to them. The mandible (text-figure 126) 

 has slender, almost colorless shafts, the beveled portion with dark-brown concentric 

 lines and prominent distal expansions on either side. 



My specimens did not correspond in all details with the descriptions by either 

 Schmarda or Grube. Both gave only the briefest diagnoses, and Grube pubhshed no 

 figures; moreover, Schmarda's description of the jaw would apply to any species of this 

 genus. He states that there is no ventral cirrus, which is evidently an error, and that 

 the gills arise as bifid structures about the middle of the body. In those I have they 



