LEODICHXE OF THE WEST INDIAN REGION. 



83 



Neither of my specimens retained the pygidium. Professor Verrill's shows the 

 posterior end smooth, with no trace of metamerism for a length equal to 4 or 5 somites, 

 then a slight enlargement forming the pygidium, which carried three anal cirri, one 

 longer than the other two ; apparently there were originally four. All were short. 



The maxilla (text-figure 296) is delicate and transparent, the only noticeable color 

 being two narrow bands at the junction between each carrier and the forceps, and the 

 triangular plate distal to the distal paired, which are dark brown. (The parts were 

 separated in mounting them for study.) The remainder of the apparatus is colorless 

 by transmitted light, only very faintly straw-colored by reflected light. The carriers 

 are long, nearly triangular in outline, with a very narrow wing at the posterior end. 

 The basal portion of the forceps is nearly one-half of the whole, the terminal portion 

 only slightly curved. Each proximal paired plate has 4 prominent teeth, with a rudi- 

 mentary fifth on the right plate. The unpaired plate has 4 teeth, the distal paired plates 

 have 2 on the left and 4 on the right. The drawing of the left distal paired plate may 

 not bs quite accurate as to outline. I was able to determine the number of teeth, but 

 not the correct outline of the whole plate. There is an accessory plate lateral to each 

 distal paired. The mandible (text-figure 297) is longer than the maxilla, has, so far as 

 I could tell, very slender shafts (I was unable to remove enough of the adherent tissue 

 in the specimens at my command to be quite sure of the outline of the shafts), and the 

 distal portion shows a beveled area with concentric brown lines. In the figure these are 

 seen through the transparent anterior end of the mandible, the drawing being from the 

 dorsal surface. Each lateral uprolled edge is dark brown, and streaks of similar color 

 occur at the point of contact of the two halves. 



Mclntosh (1910, p. 453, plate LIV, figure 3; plate LXIII, figures 5 and 5a; plate 

 LXXV, figures 3 and 3a; plate LXXIV, figures 1-lc) described and figured Nematonereis 

 unicornis Grube, with which hebes shows some points of agreement. This was first 

 described as Lumbriconereis unicornis by Grube (1840, p. 80), but later Schmarda 



290 292 293 



TEXT-FIGURES 288 to 297. Nematonereis hebes Verrill. 



288. Head from dorsal view x34. 



289. Head from latero-dorsal view 



X34. 



290. First parapodium x200. 



291. Tenth parapodium x200. 



292. Hooked acieula x666. 



293. Simple seta x666. 



294. Compound seta x666. 



295. Pectinate seta x666. 



296. Maxilla x!42. 



297. Mandible x!42. 



