NO. 1 HARTMAN : POLYCHAETOUS ANNELIDS 123 



2. Some posterior segments with simple, filamentous branchiae 

 E. (N.) carihoea, p. 123 



2. Posterior segments lack branchiae 3 



3. Unpaired maxillary plate III with about 6 to 8 teeth .... 

 E. (N.) kinhergi, p. 124 



3. Unpaired maxillary plate III with 4 teeth E. (N.) brevis Ehlers 



The last 3 named, cariboea, kinbergi, and brevis, are separable with 



difficulty, and may indeed represent a single species. 



Our collections include representatives of E. (N.) kinbergi and E. 



(N.J cariboea (below). 



Eunice (Nicidion) cariboea Grube 

 Plate 7, Figs. 157-163; Plate 8, Fig. 178 



Eunice cariboea Grube, 1856, p. 57. 



Eunice culebra Treadwell, 1902, p. 197, fig. 37. 



Leodice culebra Treadwell, 1921, pp. 49-51, pi. 2, figs. 13-16, 



Eunice gagzoi Augener, 1922, p. 45. 



Eunice cariboa Monro, 1933, p. 63 (with synonymy). 



Collections.— 2A9-3A (1) ; 412-35 (1) ; 633-37 (1) ; 634-37 (1). 

 All collections are fragments, from which a longer or shorter pos- 

 terior part is missing. Only one (coll. 249-34) has a short, branchiate 

 region from a far posterior part ; it has 232 segments, is 48 mm long, and 

 has long, cirriform branchiae (pi. 7, fig. 161) from segment 222. The 

 others entirely lack branchiae in so far as they are known. On the whole, 

 the anterior end is slightly more robust than in E. (N.J kinbergi (be- 

 low), and the prostomial antennae are weakly and irregularly ringed, a 

 character that may have little significance. 



An anterior portion of 111 segments measures 37 mm long (coll. 

 634-37). Ventral cirri are absent from the thirty-eighth segment, pos- 

 teriorly. In another (coll. 633-37) they are absent from the thirty-fifth 

 segment, and in a third (coll. 412-35) they do not disappear before about 

 the fiftieth segment. The 5 prostomial antennae are thick, irregularly 

 ringed, the longest shorter than the greatest width of the prostomium. 

 Peristomial cirri are short, smooth, cirriform, about half as long as the 

 peristomial ring. Parapodia (pi. 8, fig. 178) increase in size from the 

 first to about the ninth, after which they remain about equal in size to 

 one another until the twenty-fifth segment ; after this they again decrease 

 in size (pi. 7, fig. 163) ; this is due largely to the vanishing ventral cirri. 

 Subacicular hooks are dark, first present from about the thirtieth para- 

 podium; they are single in parapodia, distally bidentate (pi. 7, fig. 158). 



