ANGUILLULID^l FBOM TEOPICAL OECHEDS. 81 



plants, on the Fiji Islands, the tail attains nearly one-third 

 of the whole body-length. It is thus considerably longer; 

 but, moveover, Aphel. longicaudatus differs in the situa- 

 tion of the vulva, the distance between the vulva and the 

 anus being not longer, but only half as long as the tail. 



2. — Ehabditis coeonata, Cobb. Fig. 2. 



Bhabditis coronata, Cobb, Nematodes, mostly Australian 

 and Fijian, Sydney, 1893, p. 30, PL III., fig. 1. 



Male 0*5 mm., female 0*6 mm. ; a, in the male = 15, 

 in the female = 16 — 17 ; p in the male 4 J, in the female 

 4y ; y in the male = 23, in the female = 71 — 8. 



I identify this species, which differs from all the other 

 numerous representatives of the genus in the singular 

 structure of the head, with Bhabd. coronata, Cobb, though 

 not with full certainty, because the description as well as 

 the figures published by that author, leave much to desire 

 as regards exactness and completeness. The principal 

 character is described by Cobb in the following words : — 

 "The head was surmounted by six (?) conical lips, each 

 turned outwards," and for the rest, the dimensions also 

 agree rather well, when we consider that only a young 

 individual was observed by him. The single specimen, a 

 female, observed by the Sydney naturalist (the male 

 remaining unknown) had only a length of 0"36 mm. 



The body of these worms is of a rather stout and plump 

 shape, and tapers at first only a little anteriorly, but from 

 the middle of the oesophagus towards the head (PI. Ill, 

 fig. 2) with increasing rapidity, so that the diameter of the 

 head at the base of the lips measures only one-fourth of the 

 body-diameter at the commencement of the intestine. 

 Opposite the anus the females are just half as broad as at the 

 posterior extremity of the oesophagus, but the males are 

 somewhat broader at the anus, as usual. The cuticula is 



