290 Mr. H. A. Baylis on some 



Measurements (in mm.), taken from two males and three 

 mature females : — 



d. 2- 



Length 5-2-6 5-52-6 



Thickness— at crown of hairs 0-033-0-037 0-037 



,, at base of oesophagus . 0-15-0-16 014-0-15 



„ at middle of bo jy 0-22-0-24 0-19-0-25 



„ at anus 009 0-09-0-1 



Length of cesophagus 0-8-0-93 0-81-0-9 



„ tail 0-33-0-35 0-4-05 



„ spicules 0-12-0-15 



Distance from head-end to excre- 

 tory pore 0-065 0-0625-0-075 



Distance from head-end to nerve- 

 ring . . . : 0-40-0-44 0-39-0-42 



Distance from head-end to vulva . . . . , 1-41-1-65 



a 23-6-25 22-2-29 



/3 6-4-6-5 6-6-6-8 



y 15-7-17 11-1-13-8 



The body tapers considerably both anteriorly and poste- 

 riorly, the neck especially being very slender. Posteriorly 

 the tapering- begins a little in front of the anus. The cuticle 

 is quite smooth, no transverse striations having been detected. 

 In tiie male only there are a few slender hairs (fig. 2, p. 292) 

 on the ventral surface in front of and behind the anus, and 

 a fe-w shorter and more scattered hairs on the tail. The 

 lateral fields are of a coarsely cellular appearance, and 

 measure 0*025 mm. in width. 



The head (fig. 1) is very narrow. Near the extremity 

 there is a crown of six stoutish bristles, which stand out at 

 right angles to the long axis of the body, their tips curving 

 forward. Two of the bristles are lateral, two subdorsal, and 

 two subventral. The chief peculiarity of the species is the 

 fact that instead of the pair of circular or spiral lateral organs 

 near the anterior end, characteristic of the majority of free- 

 living nematodes, there appears to be on either side a lonoi^ 

 tudinal row of thirty or more very small pits in the cuticle 

 (fig. 1, L.), -which may possibly be regarded as "lateral 

 organs." Tliey are situated just above the level of the latjral 

 field on either side, and are, therefore, subdorsal in position. 

 De Man (1884, pi. i. figs. 3, 3 a, 3 d) figures a row of organs 

 in Deontolaimus pnpillatus, which would appear, from <he 

 figures, to be of a somewhat similar nature. Accordinr rto 

 his account of this species, however (1884, p. 32), they \re 

 " papillae " rather than pits, and occur, in the male only, i j; a 

 single median ventral row extending throughout the wl iole 



