no 



LEODICID^ OP THE WEST INDIAN REGION. 



9f 



The proximal plates have each 5 teeth, the second 2, and the third 1. I regard as 

 the mandible two small black chitinous plates lying anterior to the maxillse in the 

 wall of the pharynx, shown in their relative position in figure 411. 



My specimens agree in all essential points with Webster's description. Mcintosh 

 (loc. cit.) identified as belonging to Webster's species a specimen dredged on the Chal- 

 lenger Expedition at station 47, off the coast between New York and Halifax, latitude 

 41° 14' N., longitude 65° 45' W., in 1,340 fathoms. Mcintosh's specimen had 3 teeth 

 in the second maxillary plate, Webster's had 1, and the Key West specimens had 2. 

 If the identifications are correct, this character is a variable one. Mcintosh's specimen 

 also had lost the posterior end, so that it was not possible to confirm Webster's account 

 of the bifid parapodium. On account of the structure of the parapodium and the 

 toothed base of the forceps Mcintosh thought his specimen should be classed as Laranda, 



More recently, Mcintosh has described as variety elisabethcc of this species (1910. 

 p. 393, plate lxii, figures 7, 7a, 7b; plate lxxiv, figure 4; plate lxxxiii, figures 1 and la) 

 specimens taken from the stomachs of fish at St. Andrews and southwest of Ireland, in 

 40 fathoms. He returns to Drilonereis as the generic; name instead of Laranda, as in 

 his earlier paper. This variety differs from the descriptions of Drilonereis longa in that 

 it has eyes, that there is a prominent dorsal lobe on all but the 

 first few parapodia, and in the character of the jaw apparatus. 

 These seem to be characters of specific value and it does not 

 seem accurate to list it as a variety of longa. 



Webster's specimens of D. longa were collected in North- 

 ampton County, Virginia, between the mainland and the out- 

 lying islands, "in mud and sandy mud," and were reported as 

 abundant. It was recorded by Andrews (1891, p. 288) as common 

 in sand at Beaufort, North Carolina. 



Drilonereis pinnata, new species. 



(Plate 8, figure 11; text-figures 412 and 413.) 



A large species of this genus, the one from which the figure 

 was drawrl being 2 mm. in body diameter. The type was much 

 smaller, having a body diameter of 0.5 mm., a length of 300 

 mm,, with over 700 somites. 



The prostomium (plate 8, figure 11) has the flattened form 

 characteristic of this genus and carries a pair of eyes which are 

 usually drawn back under the margin of the peristomium, but 

 are visible when the latter is retracted. A characteristic feature 

 of the prostomium is the peculiar pinnately branched markings 

 on the dorsal surface (plate 8, figure 11), which possibly repre- 

 sent blood-vessels. These form a series of straight lines arising 

 at an angle from either side of a central axis. The body has 

 little pigmentation, but is more or less colored by the blood and 

 has a considerable surface iridescence, these tints being strongest 

 throughout the middle region. The prostomium is about as wide 

 as later somites and there is a gradual increase in width up to 

 the middle of the body. There are two pairs of anal cirri, one 

 pair much larger than the other. 



Unlike the usual rule in this genus, the parapodia are 

 prominent from the first. Each has a short setal lobe, contain- 

 ing a single acicula, a tuft of simple setse, and a long posterior 



412 413 



Text-figures 412 and 413. 



Drilonereis pinnata 

 Treadwell. 



412. Simple seta x210. 



413. Jaw apparatus x55. 



