240 



ORDER BOLBINIA 



that at last it is about half as wide as the base of the neck. The lining is faint, 

 and there are no refractive breaks in its structure to indicate the presence of 

 vestigial bulbs. There is no distinct cardia. The intestine becomes at once 

 two- to three-fifths as wide as the body. It is composed of cells containing 

 scattered groups of granules. The distinct "lumen," instead of appearing as 



m ? 



.93- 

 3.1 



cavity with 

 refractive 



is. _24. "w 9*. lining, 



it 



.trmd 



X750 



hmoe 



2. $,4 3.5 3-5 -=V3.2 ' usually does 

 when a distinct feature, seems to have a dif- 

 ferent structure of about the same general 



fllMI a PP earance - From the slightly depressed anus 

 the conspicuous rectum extends a distance about 



w^ one and one-half times as great as the anal 



** U ^ J- T J: rt 4- rt T^l-^xx ] n -l- A - n l -C !,!,, 



body diameter. The lateral fields are one-third 

 as wide as the body. It appears as if there is a renette cell opposite the pos- 

 terior portion of the oesophagus. The tail is conoid to the blunt terminus, which 

 has a diameter about one-third as great as that of the base of the tail-. There 

 are no caudal glands. It is possible there is a pair of subventral papillae imme- 

 diately behind the anus. A trifle behind the middle of the tail, there are two 

 faint, lateral innervations close together on each side, one in front of the other, 

 doubtless connected with surface papillae. Ventrad from these, it is possible 

 there is a third papilla belonging to the same group. There are probably one 

 or two pairs of subventral papillae near the terminus. The proximal ends of 

 the tapering, very slightly arcuate spicula are bent in a ventral direction so as 

 to appear to lie on the ventral side of the body-axis, and 

 so appear cephalated. The accessory piece is more 

 strongly refractive than the spicula themselves, the frame- 

 work of which is not particularly conspicuous. 



Habitat: About the roots of Bamboo, Yuma, Arizona, 

 06 I! ?--- \ iimph U. S. A. Fig. 15, above. 



16. Bolbinium brevicolle n. sp. Cuticle of medium 

 thickness, naked. Posterior half of the neck cylindroid, 

 anterior half convex-conoid. Amphids unusually large, 

 with large internal connections that can be followed back- 

 ward for some distance. The narrow oesophagus contin- 

 ues to have the same diameter until near the posterior, 

 pyriform, cardiac swelling, which is one-half as wide as 

 the base of the neck. Many of the nuclei connected with 

 the cells of the neck are large and well-developed. 

 In the dorsal and ventral fields there are strands that 

 appear to be composed of closely-packed cells. The car- 

 diac bulb has no distinct valve. 



as -mi 



1 -* * ^ The spiculum is vestig- 



ial. In a variety of ways this nema seems related to the 

 Mermithidae, for instance, in the structure of the mouth, 

 the cephalic papillae, the amphids, the internal structure of the tissue of the 

 neck and of the body, the absence of spinneret, and the short, rounded, broad 

 tail. 



Habitat: Soil, about the roots of citrus plants, Florida, U. S. A. Fig. 16. 



