LEODICID.E OF THE WEST INDIAN REGION. 



121 



very long and slender, simple seta with two much shorter ones, slightly widened toward 

 the end, an indication of a terminal toothing, and denticulations along the convex 

 edge (text-figure 436). In later somites these setae are not represented, their places 

 being taken by a somewhat stouter, unequally bifid one, strongly denticulated along the 

 convex edge (text-figure 437). The simple setae in these later somites are a little larger 

 than in the first and are denticulated along the edge (text-figure 438). The compound 

 setae (text-figure 439) have long terminal joints with very delicate terminal teeth, diffi- 

 cult to demonstrate. 



The maxilla (text-figure 440) consists of two rows of sharp teeth on either side, the 

 teeth being more or less secondarily toothed. The basal portion is much heavier than 

 in S. rubra and there are two double rows of separate teeth on either side distal to these. 

 The mandible (text-figure 441) is more slender than in S. rubra and does not spread 

 quite so widely. 



TEXT-FIGURES 435 to 441. 

 Stauronereis polydonta Verrill. 



435. Tenth parapodium x90. 



436. Seta from first parapodium x666. 



437. Seta from later somite x666. 



438. Simple seta x666. 



439. Compound seta x666. 



440. Maxilla x90. 



441. Mandible x90. 



Stauronereis rubra Grube. 



(Plate 9, figures 20 to 23; text-figures 442 to 451.) 

 Anisoceras rubra Grube, 1856, p. 60. 



A small species with an average length of 33 mm. and a width at the head of 2 mm. 

 with 80 somites. 



In life the body is light vermilion anteriorly (plate 9, figure 20), but this is largely 

 lost behind the tenth somite, though a reddish tinge, due to intersegmental coloration, 

 can be distinguished throughout the greater part of the body. Posteriorly there is very 

 little color, and in general the appearance is due largely to the intestinal contents seen 

 through the body-wall. All of the parapodia are colorless, and no color remains in 

 preserved material. 



