242 



ORDER BOLBIXIA 



nrvr 



.9 >. 



18. Cyartonema flexile n. sp. Except for the cephalic setae the cuticle is 

 naked. There appears to be a circlet of six, inconspicuous, minute papillae 



.15 5-1 8.4 -47f' 



'.ii' 1.3 '/i-i" 2.2 



.23 7.4 10.3... "M. 



."83 'i.6' /L6 1.7 



on the margin of the head. 

 The form and structure of 

 the gland at the base of the 

 narrow oesophagus is remi- 

 niscent of the salivary 

 glands in Tylenchus. The 

 intestine is made up of cells 

 so arranged that only one 



to two are required to build a circumference. The parts of 

 these cells are so differentiated that the groups of granules char- 

 acteristic of the cells occur at intervals equal to one to two body- 

 diameters, and are more or less alternated with finely granular 

 intestinal elements, or what are suspected to be such (see Figure 

 18, int.?). The tail, tapering from in front of the anus, is con- 

 oid then cylindroid in the posterior fifth. Spinneret with min- 

 ute setae. A single caudal gland was seen near the middle of 

 the tail. A few very inconspicuous setae were observed on 

 the tail. Concerning the lateral fields, I was at times uncer- 

 tain whether the cells marked intf were not in some way con- 

 r&l \>f!\ '' : \ nected with these fields. From the somewhat elevated vulva, 

 the relatively large vagina leads inward two-fifths the way 

 across the body. The eggs are three to four times as long as 

 the body is wide, and about one-fourth as wide as long. The 

 broad, more or less cylindroid ovaries suddenly taper near 

 the blind end. They contain apparently only four to five ova, 

 * 500 arranged single file. The clavate testis is about two-thirds as 



wide as the body. 



Habitat: Clean, white sand, in about five feet of water, in a cove near the 

 entrance to Buzzard's Bay, Mass., U. S. A. Sublimate to balsam. Fig. 18. 



set to (6) 



19. Stilbonemabrevicollen.sp. Annules 

 plain, retrorse in the posterior half of 

 the body, the reverse in the anterior. 

 Exceedingly short, submedian, slender 

 setae are found throughout the length 

 of the body, six to nine annules apart, 



those at the extremities being somewhat WA ^^\'^" / '^^JUT tib 1 



the longer. Neck cylindroid. Imme- 

 diately around the mouth there is prob- 

 ably a row of exceedingly minute papil- 

 lae. In most of the neck the diameter 

 of the oesophagus hardly exceeds the J0B...V " *750 



thickness of the cuticle; it finally expands to form a pyriform bulb about three- 

 fifths as wide as the base of the neck. There is no distinct cardia. The very 



