LEODICID^E OF THE WEST INDIAN REGION. 101 



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The first parapodium has a broad base and a conical posterior lobe. The tenth 

 (text-figure 365) in general outline is something like the first, but larger and more slender. 

 Later parapodia do not differ essentially from these. 



The setae of the first parapodium are all compound (text-figure 366), the terminal 

 joint with 2 large and 3 small teeth, the whole covered by a hood. A similar hood 

 covers the apex of the basal joint. In the tenth parapodium similar compound setae are 

 found, accompanied by simple ones. The simple setae (text-figure 367) are curved and 

 sharp-pointed and with a wing along the margin. The posterior part of the body has 

 only one form of seta; these are simple, rather stout, with a bent toothed apex and a 

 hood extending for only a short distance down the basal portion (text-figure 368). 



The maxilla (text-figure 369) has a slender, rather elongated carrier, the forceps 

 slender. The proximal plates have each 4 teeth, the distal two pairs have 2 and 1, 

 respectively. The whole apparatus is dark brown in color. The mandible (text-figure 

 370) is much lighter in color, with the shafts firmly united along their entire length 

 and the beveled portion with concentric lines. A heavy white incrustation borders the 

 beveled surface anteriorly. 



My collections from the Dry Tortugas contained some incomplete specimens and 

 others were in Yen-ill's Bermuda collections. The U. S. National Museum has specimens 

 from Key West and from latitude 25 47' N., longitude 80 05' W., in 85 fathoms. 

 Ehlers's specimens were collected at Key West in 7 fathoms. 



Lumbrinereis nasuta Verrill. 



(Plate 7, figures 10 to 12; text-figures 371 to 377.) 

 Lumbrinereis nasuta Verrill, 1900, p. 651. 



Living specimens (plate 7, figures 10, 11, 12) showed more or less brownish 

 pigmentation, especially toward the anterior region of the body, the median and 

 posterior regions being much lighter. The color of the animal is also much modified 

 by the tint of the blood showing through the body-wall and by the surface iridescence. 

 There are several irregularly grouped patches of pigment on the surface of the prosto- 

 mium. Alcoholic specimens are dark, rather dirty brown in color, and very markedly 

 iridescent for the first 30 somites, while behind this there is much less iridescence and 

 a much lighter body-color. My Bermuda collections in 1916 contained two lots, one 

 from Tuckerstown Bay and one from Boat Bay. The individuals differed very much 

 in size, those from the latter locality being hardly more than half as large as those 

 from the former. The smaller ones were also nearly devoid of color after preservation. 

 They agree with the large ones, however, in the structure of jaws and setae, so that there 

 is no question of their identity. The peristomial width of larger specimens is 1.5 mm., 

 with a diameter of 44 mm. in the widest portion. 



The prostomium (plate 7, figure 1 1) is a relatively elongated cone with brown patches 

 on its dorsal surface and a narrow base. The peristomium is a trifle wider than the 

 prostomium and nearly twice as long as the second somite. There is a gradual increase 

 in width to about the twenty-fifth somite, but a gradual narrowing behind this point. 



The first parapodium (text-figure 371) has a rather thick setigerous lobe with small 

 seta-like aciculae. The posterior lobe is nearly as thick as the setigerous portion at 

 the base and tapers gradually to a blunt apex. The tenth parapodium (text-figure 372) 

 has essentially the same structure as the first, but with a more prominent posterior lobe. 

 In later parapodia the only modification of this structure which appears is the elongation 

 of the basal portion, so that the whole organ extends to a greater distance from the body. 

 There are two pairs of subequal anal cirri. 



