LEODICID^ OF THE WEST INDIAN REGION. 



95 



The anterior parapodia have two forms of simple setae: one (text-figure 336) sharp- 

 pointed, curved toward the apex, and with a marginal wing; the other (text-figure 337) 

 curves slightly toward the apex, narrows to a slender neck, and terminates in 5 teeth, of 

 which the basal one is the largest, the whole covered by a hood. The posterior parapodia 

 have only one form of seta (text-figures 338 and 339) ; these have a subterminal constric- 

 tion and a terminal row of teeth, of which the basal one is the largest. Figure 339 shows 

 one of these in full face, demonstrating the double nature of the hood which covers the 

 apex. These are all much shorter than in most species of this genus, being scarcely longer 

 than the posterior lobe of the parapodium. The anterior aciculae (text-figure 340) are 

 slender and sharp-pointed; the posterior ones (text-figure 341) are much larger and with 

 a bluntly rounded apex. 



The maxilla (text-figure 342) is somewhat similar to that of L. nuchalis (see p. 105) 

 but the carriers and forceps are longer and more slender. The proximal paired plates 

 have each 3 large teeth and 2 terminal smaller ones, the terminal ones being at a higher 

 level than the others. The second pair of plates have 2 teeth and the third pair 1 tooth. 

 The mandible is more slender than in L. nuchalis, the halves more distinct, and there is 

 practically no color in the shafts (text-figure 343). The beveled portion is marked with 

 concentric brown lines. In the specimen figured the outer angles of the beveled portion 

 were drawn out into sharp points. These did not appear in other specimens. 



Collected in April 1918, in sand, in Buccoo Bay, Tobago. 



Type in the American Museum of Natural History. 



Text-figures 333 to 343. Lumbrinereis branehiata Treadwell. 



333. Tenth parapodium x55. 



334. Posterior parapodium x55. 



335. Dorsal view of somites showing branchial 



lobes x6. 



336. Anterior simple seta x220. 



337. Anterior hooded seta x380. 



338. Posterior simple seta x220. 



339. Posterior seta in face view x220. 



340. Anterior acicula x220. 



341. Posterior acicula x220. 



342. Maxilla x38. 



343. Mandible x38. 



