124 



LEODICIDyE OF THE WEST INDIAN REGION. 



anterior pair being much larger and slightly farther apart than the posterior. The palps 

 are long and slender, slightly wrinkled on their posterior faces (plate 9, figure 18). 



The tentacles are shorter and more slender than the palps, articulated throughout. 

 The peristomium and first somite are marked with brilliant red bands, occupying a large 

 part of their dorsal surfaces, while succeeding somites, as far back as the region of the 

 eighteenth, have a narrow red line toward their anterior margins (plate 9, figure 18). 



Beginning with somite 10 and extending to about the middle of the brdy, each 

 somite carries a triangular white dorsal patch, with the apex directed anteriorly and 

 running onto the somite in front. The remainder of the body is pale yellow. None of 

 this color persists in preserved material (Plate 9, figure 19). 



The first parapodium (text-figure 452) is without a dorsal cirrus, but has a promi- 

 nent ventral one. There is a slender, cirrus-like posterior lip to the setigerous portion, 

 and a large acicula extends into the latter just anterior to this lip. The later parapodia 

 (text-figure 453 of the tenth) have prominent dorsal cirri, which in some cases seem 

 to be jointed at the end, but this (possibly because of poor preservation) was not demon- 

 strable in all somites. The cirrus contains a tuft of needle aciculse. The setal lobe is 

 beveled at the apex; there is a small posterior lobe and a slender ventral cirrus. Later 

 parapodia do not differ in any important respects from the tenth. 



Ventrally each parapodium has a tuft of compound setse, showing a definite increase 

 in length from the ventralmost toward the dorsal side of the tuft. They are slender, 

 with a long, narrow, very decidedly bidentate end, and covered with a delicate hood 

 which extends beyond the seta and is denticulated along the edge (text-figure 454). 

 Dorsally there are two sorts of simple setae, differing from one another mainly in their 

 proportions. One is slender, very finely bidentate at the end and finely denticulated 

 along one edge; the other is broader (text-figure 455), but with essentially similar dentic- 

 ulations and terminal teeth. There is a single, straight acicula, not penetrating the 

 apex of the parapodium. 



The jaw apparatus is similar in general outline to the other species of this genus. 

 I was unable to mount an unbroken maxilla and the figure (text-figure 456) is of only a 



TEXT-FIGURES 452 to 458. 

 Stauronereis iritlata Grube. 



452. First parapodium x90. 



453. Tenth parapodium x90. 



454. Compound seta x666. 



455. Simple seta x666. 



456. Part of maxilla x65. 



457. Single maxillary tooth x305. 



458. Mandible x75. 



455 



