96 



LEODICID^E OF THE WEST INDIAN REGION. 



Lumbrinereis Candida, new species. 



(Plate 8, figures 7 to 9; text-figures 344 to 350.) 



A rather small species. A preserved specimen, about 300 mm. long, had over 300 

 somites, a prostomial width of 1 mm., and a body diameter of 2 mm. 



In life the prostomium is an elongated cone (plate 8, figures 7 and 8), at its base 

 about equal in width to the first somite. When moving, the prostomial margin is fre- 

 quently drawn back, so as to expose the rounded lobes of the everted nuchal organs. 

 Each of these has a reddish longitudinal dorsal line, probably a blood-vessel, which gives 

 it the appearance of being longitudinally divided, the whole looking like a row of short 

 tentacles overlapped by the prostomial margin (plate 8, figure 8). The anterior end is 

 bright pink in color, with more or less of a grayish tint, and by the tenth somite this 

 latter becomes very marked. When fully developed this coloration appears as a- trans- 

 verse band of minute gray spots running entirely around the body. The precise tint of 

 the middle and posterior regions depends on the distribution of these gray spots and the 

 condition of the blood-vessels in the intersegmental constrictions. In the median region 

 the surface above and below is a greenish gray, with a darker tint along the parapodial 

 line. In the posterior region the gray bands are narrower, and usually the blood in the 

 intersegmental constrictions gives them a dark wine-color (plate 8, figure 9). 



The parapodia are prominent from the very first, and in the posterior region are 

 wider than half the body diameter. They have approximately the same form through- 

 out. (See text-figure 344 of the tenth and figure 345 of the two-hundredth.) Each has 

 a rounded setal and elongated posterior lobe. In the tenth there were a few straight 

 aciculse, but I could find none in the two-hundredth. There are two pairs of short 

 conical anal cirri. 



In the anterior somites there is a vertical row of seise, following the order which is 

 frequent in this genus, viz: dorsally several pointed winged ones, then several hooded 

 hooked ones, and finally on the ventral surface a single one like the dorsalmost, but 

 shorter. In the posterior regions there are only a few (three or four) hooked and hooded 

 ones with long shafts and small hoods. The winged setae (text-figure 346) have long, 

 slender, curved, and pointed shafts with striated hoods. The anterior hooded ones (text- 



TEXT-FIGURES 344 to 350. 

 Lumbrinereis Candida Treadwell. 



344. Tenth parapodium x80. 



345. Two-hundredth parapodium x80. 



346. Seta from anterior parapodium x380. 



347. Seta from anterior parapodium x380. 



348. Posterior seta x380. 



349. Maxilla x35. 



350. Mandible x35. 



