8 Cobb — Nematodes, mostly Australian and Fijian. 



Anus at 96 % to 87 %. 



Worm about 1 • mm. long. 



Pharynx thrice as long as wide 7. parvus. 



Pharynx twice as long as wide 8. criatatus. 



Pharynx about as long as wide 9. minor. 



Worm about 1 -8 mm. long. 



Pharynx narrow, twice as long as wide 10. papillatus. 



Pharynx about as wide as long 11. muscorum. 



Worm about 3 mm. long 12. major. 



Tail in the posterior part cylindroid. 



Anns at 82%; pharynx less than three times as wide as long 13. longicaudalus. 



Anus at 86% ; pharynx four times as wide as long 14. truncatus. 



(15. macrostoma. 

 Anus situated at length at not le.ss than 90 % s 



16. fovearum. 



,„l-2 



1. M. digiturus, n.sp. H 3".^ ^I'." '^3.4 ^2-3 i*""™- The truncate head is only very 

 slightly expanded. Each lateral field appears to end in a curve opposite the anterior 

 part of the pharynx, and I surmise that these curves are the lateral organs. The 

 jjharynx, which is as long as the head is wide and two-thirds as wide as long, is entered 

 through a vestibule one-fifth as long as the pharynx proper ; three longitudinal 

 chitinous ribs occur at the angles of the internal surface of the pharynx and near their 

 bases are seen three subequal rather rudimentary basal teeth, of nearly equal size, only 

 one-third as long as the cavity. The oesophagus is about three-fifths as wide as the 

 neck, being in the middle somewhat narrower than elsewhere ; it is separated from the 

 intestine by a distinct constriction. The gut is three-fourths as wide as the body and 

 ends in a rectum a trifle longer than the anal body-diameter. A ventral pore occurs 

 just behind the nerve-ring. The tail is arcuate-conoid to the somewhat blunt terminus. 

 This and the next are the only known species in which the female sexual organs are 

 not double and symmetrical, and as usual it is the posterior branch which has 

 disappeared ; the remaining anterior branch is short and reflexed. The vulva is not 

 prominent. Drawings are given on PI. i. 



This worm was found in small numbers about the roots of banana plants, Fiji, 

 July, 1891. No males were seen. 



2-6 6-8 23-5 'C7 



2. M. gymnolaimus, n.sp. 2-2 a-g 27 — ?3 — re 2-94mm. The neck of this species is 

 cylindroid. The diameter of the inner circle of cephalic papillse is half that of the 

 outer circle. The vestibule is one-fourth as long as the pharynx proper. Opposite 

 the anterior part of the pharynx, near what appears to be the termination of the 

 lateral fields, occur small transverse elliptical markings, probably representing the 

 lateral organs. The strongly three-ribbed triquetrous pharynx is as long as the head 

 is wide, and one-half as wide as long, and presents a single rudimentary dorsal tooth 

 at the base. The transverse striae on the wall of the pharynx near the middle are 



