36 LEODICID^E OF THE WEST INDIAN REGION. 



all. The compound setae (text-figure 89) are very small, each with a small terminal 

 joint having apical and subapical teeth, but no basal tooth. The terminal joint is cov- 

 ered by a hood, which is only faintly serrated in the anterior somites, but this becomes 

 more noticeable farther back. The apex of the basal joint is also serrated. The pectinate 

 setse (text-figure 90) are small and delicate, with 6 to 8 relatively rather prominent 

 teeth. The dorsal acicula (text-figure 91) is slender, blunt-pointed, and a very faint 

 yellow in color. The ventral ones which appear in later somites have a very small 

 terminal tooth, a second proximal to this, and a much larger one proximal to this. The 

 whole is much heavier and denser-colored than is the case with the dorsal (text-figure 92). 



The gills begin as a single filament on the third parapodium. By the seventh there 

 are 2 filaments and by the tenth or eleventh there are 3. On the thirteenth there may 

 be 4 and they are present as far as the fiftieth parapodium. Between the fortieth and 

 the fiftieth there may be as many as 5 filaments. They are always very delicate and never 

 very bright red, so that in the living animal they are never conspicuous. The dorsal 

 cirri are always more prominent than the gills, but behind the gill region they become 

 very inconspicuous. 



The maxilla (text-figure 93) is very delicate with short carriers, having broad wings 

 and stout forceps, whose apices are narrow. The asymmetrical appearance of the 

 forceps in the figure is due to the fact that the right half had been partly rolled so as to 

 show its flattened surface. The right proximal paired plate has 11 teeth and the left has 

 8; the unpaired has 10. The distal paired plates have each as many as 11 teeth, which are 

 not all shown in the figure, since the plates are partly covered by others. The maxilla 

 is a light brown in color except for the tips of the forceps, a basal band on each half of 

 the forceps, and the distal paired plates. The mandible (text-figure 94) is almost color- 

 less, the only pigment being along the line of junction of the two halves. The beveled 

 portion is marked by very fine concentric lines. L. rubrivittata resembles L. unifrons of 

 Verrill (see p. 17) in the form of its prostomium, in the extreme delicacy of its structure, 

 so that it is almost impossible to secure an unbroken specimen, and in its mode of life. 

 It lives in tubes composed of bits of pebbles fastened together on the under side of stones, 

 these tubes being usually many times as long as the animal and extending for consid- 

 erable distances over the rocks. 



Collected in March and April 1918 on rocks at Buccoo Reef, Tobago. 



Type in American Museum of Natural History. 



Leodice binominata Quatrefages. 

 (Plate 3, figures 9 to 12; text-figures 95 to 10(3.) 



Eunice punctata Grube, 1856, p. 59. (Name preoccupied.) 



Eunice binominata Quatrefages, 1865a, volume 1, p. 327. 



Eunice binominata Ehlers, 1887, p. 85. 



Leodice binominata Verrill, 1900, p. 640. 



Eunice binominata Augener, 1906, p. 132, plate 4, figures 60-63. 



During life the body is characterized as to color by a mottling of browns, yellows 

 and reds, the latter effect being heightened by the color of the gills in the anterior region 

 of the body (plate 3, figures 9 to 12). The prostomium is rounded in front with little 

 lobing, its surface marked in life by orange-red on a yellowish-white background. This 

 general color is continued on later somites, but largely because of the color of the intes- 

 tinal contents the middle region of the body is usually darker, and posteriorly it may 

 become nearly purple. Beginning with the sixth or seventh, each somite bears on its 

 median dorsal surface a collection of small white spots which together make up a white 

 patch, and these patches are continued throughout the body, while smaller white spots 

 are scattered over the entire dorsal surface. The second somite has a white band across 



