LEODICID^E OF THE WEST INDIAN REGION. 



123 



Laterally a thin wing connects each tooth with the adjoining one. The teeth of the dorsal 

 row (text-figure 450) have a short basal portion, and two sharp arms extend out from 

 this. Between the two arms is a series of sharp teeth. Lateral to the main rows are 

 two other rows on either side. These are much smaller than the others and vary in 

 color from light brown to black. The mandible is of two parts (text-figure 451), firmly 

 held together on the median edges, the terminal portion broadened and toothed, and with 

 a series fjf plates extending from the apex on either side. 



S. rubra is rather common in crevices of rocks at the Dry Tortugas, most of my 

 specimens coming from rocks near Loggerhead Key. I did not find it in Porto Rico or 

 in Bermuda. One specimen was collected in Tobago and one in Montego Bay, Jamaica. 

 Grube's single specimen was collected at St. Croix. It occurs in the outer crevices of 

 the decaying rocks and does not penetrate deeply into them. Its body is very soft and 

 easily injured. Possibly connected with this is the fact that regenerating individuals 

 are often found, especially those regenerating the anterior ends. 



TEXT-FIGURES 442 to 451. Stauronereis rubra, Grube. 



442. First parapodium x40. 



443. Tenth parapodium x40. 



444. Posterior parapodium x40. 



445. Compound seta x387. 



446. Simple seta x387. 



447. Simple seta x387. 



448. Maxilla x32. 



449. Single maxillary tooth x92. 



450. Tooth from dorsal row x92. 



451. Mandible x32. 



Stauronereis vittata Grube. 

 (Plate 9, figures 17 to 19; text-figures 452 to 458.) 

 Anisoceras vittata Grube, 1856, p. 61. 



The specimen figured was dredged in July 1915, in broken coral sand, south of 

 Tortugas buoy. It was an immature female, about 40 mm. long and with about 90 

 somites. The prostomium was rounded and colorless, with two pairs of eyes, the 



