104 LEODICID^ OF THE WEST INDIAN REGION. 



somites may vary, as alcoholic specimens showed the first somite much longer than 

 the second. One speci:nen contained 150 somites and was 2 mm. wide in the widest 

 portion. The body somites are marked with median transverse bands, which vary in 

 color but are usually dark brown. There are apparently four rather stout anal cirri. 

 As compared with other species of this genus in this locality, the parapodia are very 

 prominent, especially toward the posterior end, where they are very long and narrow. 

 Preserved specimens usually show a progressive increase in size of the parapodia from 

 the first to the tenth, while behind the tenth they are all very prominent. 



The first parapodium (text-figure 378) shows a rounded anterior and a pointed pos- 

 terior lobe, the latter more slender than is the case farther back. The tenth parapodium 

 (text-figure 379) shows a dorso-ventral increase in diameter, the posterior lobe being 

 somewhat flattened and bent dorso-laterally. Toward the posterior end (text-figure 

 380) the whole parapodium is much more elongated and the posterior lobe is compara- 

 tively shorter. 



The setae are of three kinds, of which the hooded from the anterior end are the 

 most diagnostic. These (text-figure 381) have a long, gently curved shaft, terminating 

 in a head with several teeth, of which the ventralmost is the largest, while a hood covers 

 more than half of the exposed portion of the seta. 



The tenth parapodium showed a vertical row of setse consisting of 4 acuminate, 

 then 5 hooded, and lastly 1 acuminate. This arrangement seems to hold good for the 

 anterior parapodia, though there may be differences in the number of each form of seta. 



The acuminate setse (text-figure 382) are much larger than the hooded, are gently 

 curved to a sharp point and have a narrow wing. In the posterior region of the body 

 only hooded setse occur, and these differ from those in the anterior region in that they 

 are much longer, the shafts are larger, and the hood covers only the very tip of each 

 shaft (text-figure 383). Under low power the apices of these setse appear as shining 

 white spots. 



The maxilla (text-figure 384) somewhat resembles that of L. floridana (text-figure 

 369), but has a much shorter carrier. The forceps is slender, its halves not much curved. 

 The proximal plates have each 4 large teeth, the next pair 2, and the distal ones 1 each. 

 The mandible (text-figure 385) also somewhat resembles L. floridana, but has more 

 sharply drawn brown lines in the basal portion. The halves are fused throughout 

 practically their whole extent and the distal beveled portion is marked with prominent 

 concentric brown lines. 



In the Key West region specimens were collected at Long Key, Tortugas, and at 

 Mangrove Key in Key West Harbor. Porto Rico specimens were from Puerto Real. 



Lumbrinereis nuchalis, new species. 



(Plate 9, figure 5; text-figures 386 to 394.) 



A rather large species with a prostomial width of 1.5 mm. and a body- width of 

 about 2 mm. One specimen, which lacked the posterior end, retained approximately 

 300 somites and after preservation measured 230 mm. in length. 



The body-color varies with the degree of distension of the blood-vessels; when these 

 are filled with blood they give the body a beautiful purple color, when emptied it is 

 rather grayish, but always with a brilliant iridescence, which may be golden. In pre- 

 served material the somites are marked with brownish transverse bands similar to those 

 which appear in other species of this genus, but as these, in this case at least, are due 

 to coagulated blood, they are of little systematic importance. 



The prostomium (plate 9, figure 5) is large, its form varying with the degree of 

 expansion. When fully expanded its lateral margins are nearly parallel for the first two- 



