Cobb — -Nematodes, mosily Australian and Fijian. 43 



one-fourtli as wide as the body. The tail is nearly hemispherical. From the incon- 

 spicuous vulva the vagina, which is one-half as long as the body, is wide, leads into 

 two long uteri, in either of which the eggs are arranged in several rows. The anterior 

 uterus is so long that the flexure in the oviduct sometimes lies in front of the cardiac 

 region, — something uncommon in free-living nematodes. Supposing the specimens 

 observed to have been mature, the sub-spherical eggs had a, diameter one-fourth as 

 great as the diameter of the body. Figured on PI. vi. 



Hab. — The young were common about the roots of banana plants in Fiji, July, 

 1891. But few adult females were seen, and no males. 



4. D. perfectus, n.sp. i \^ ^4-^ f^s '^2" ^•^S"""- The cuticula is thick and transparent. 

 The neck is conoid, becoming convex-conoid near the head, which is truncate and 

 bears six distinct doubly -papillate lips of the usual form. The well developed spear 

 is one-fifth as wide as the head and slides in a distinct close-fitting collar, situated 

 just behind the lips. The anterior part of the oesophagus is only ojie-fourfch as wide 

 as the corresponding part of the neck, but at the middle it enlarges rather suddenly 

 and becomes two-fifths as wide as the body, its component cells being of such a size 

 that ten side by side make up a circumference, and having their granular contents so 

 disposed as to give rise to a distinct polygonal tessellation. The rectum is twice as 

 long as the anal body-diameter. The pre-rectal portion of the intestine is about four 

 times as long as the anal body-diameter, or in the males, twice as long as the spicula. 

 The intestine is three-fourths as wide as the body. In the neck at least two 

 unicellular glands were observed; each of these was as long as the neck was wide and 

 emptied laterally (or sublaterally) by means of an indistinct ampulla and short narrow 

 distinct chitinous pore which plainly penetrated all the cuticular structures at a 

 distance from the head equal to five per cent, of the length of the body. The vulva 

 is not conspicuous. The eggs are one and one-half times as long as the body is wide, 

 three-fifths as wide as long, "g 2-7 ^s'e ^s^s" — ^ 2-35 mm. The tail of the male, like that of 

 the female, is rounded, and bears the four sub-median papillae, also found in the female. 

 A single ventral row of about twenty -three innervated closely approximated low papillae 

 are found opposite the ductus ejaculatorius, that is to say, begins just in front of the 

 spicula and extends nearly to the anterior extremity of the pre-rectal portion of the 

 intestine. One such papilla stands alone just in front of the anus. Seen in profile 

 the spicula are boomerang-shaped. They are acute, and are stiffened anteriorly by a 

 median thickening. The proximae are not cephaloid. Accessory pieces are apparently 

 wanting. The spicula are very likely exserted by means of muscles passing obhquely 

 to the extremity of the tail. Oblique copulatory muscles are present throughout the 

 region of the ductus. Figured on Plates v. & vi. 



