32 Co^B— Nematodes, mostly Australian and Fijian. 



bulb-like structure — pseudo-bulb. The rectum is short, seldom exceeding in length 

 the anal body-diameter. Little is known concerning the ventral excretory gland ; 

 traces of it have been observed in but one species. In this respect, as well as in 

 many others, this genus resembles Monhystera. The nerve-ring encircles the 

 oesophagus squarely some distance in front of the middle of the neck. The tail has 

 the same shape in both sexes, namely, conoid from the inconspicuous anus ; the 

 terminus, which is invariably a trifle swollen and often mucronate, gives exit to the 

 secretions of the caudal glands, — always present. The female sexual organs are 

 commonly double and symmetrically reflexed. What little evidence there is points 

 toward the number of testicles being two ( — M — ). A ventral row of equidistant 

 accessory sexual organs occurs on the male and extends forward from the anus 

 sometimes to near the head. The two equal cuneiform spicula are straight or 

 slightly curved and seldom exceed the anal body-diameter in length ; they are 

 accompanied by small accessory pieces. There is no bursa. Probably only a 

 discovery of the males of the species monhystera (and possibly also of arenicola) can 

 determine whether that species is really a member of this genus. 



Key to Triptla. 



Cephalic setae none, i.e., reduced to papillae. 

 Length about 3' mm., head rounded. 



Strise coarse and conspicuous 1. salsa. 



Striae fine and inconspicuous 2. papillata. 



Length 1*4 mm. to 2*5 mm., head truncate. 



When 1-4 mm. long read 3. affinis. 



When 2-5 m.m. long read 4. glomerans. 



Cephalic setae present, not reduced to papillae. 

 Female sexual organs asymmetrical. 



Vulva 64 o^, tail 5 o/ \^- <'^';'^ioola. 



( 6. minor. 



Vulva 78 %, tail 9% 7. monhystera. 



Fema!le sexual organs symmetrical. 



Habitat marine 8. marina. 



Habitat not marine. 



(Esophagus 25 % 9. intermedia. 



(Esophagus little, if any, exceeding 20 %. 



Tail occupying about 20 % of the length, conoid 10. filicaudata. 



Tail occupying about 15 % of the length, conoid 11. setifera. 



Tail occupying about 10 % of the length, anterior half only conoid... 12. tenuieauda. 



Key to the Males. 



Spicula shorter than the anal body-diameter. 



Habitat marine 8. marirm. 



Habitat not marine 1 1 _ 



