ANONCHOLAIMUS, ONCHULUS 



313 



The convex-conoid tail tapers from the anus to the spinneret, which is armed 

 with submedian setae. The caudal glands lie in front of the anus. There are 

 practically no caudal setae. The lateral fields are 

 two-fifths as wide as the body and contain large 

 ain/)/l ce ^ u l ar elements. Anoncholaimus has eight cervi- 

 cal glands, six emptying into the anterior part of 

 the pharynx opposite the bases of the setae and two 

 smaller, a little farther back, on the dorsally sub- 

 lateral lines. The granular contents of the ducts 

 of these glands, increased slightly in volume, form 



move back and forth during the various movements 

 of the head. Hence the specific name "mobilis." 

 The cervical glands lie behind the nerve-ring, since 

 their ducts have been followed backward to behind the nerve-ring. There are 

 also ducts of glands to be seen in the ventrally submedian sectors of the oesoph- 

 agus. The pyriform renette cell, which lies a very short distance behind the 

 base of the neck, empties through a rather distinct ampulla twice as far back as 

 the base of the pharynx. The narrow nerve-ring is accompanied by large distinct 

 nerve cells arranged in groups. From the rather large and conspicuous, more or 

 less elevated vulva, the large muscular, non-cutinized vagina leads inward to 

 the two straight uteri. The eggs are twice as long as the body is wide, and two 

 and one-half times as long as wide. Judging by their size when empty, the uteri 

 are adapted to receive one egg at a time, possibly two. The posterior ovary is 

 a little the smaller; both are more or less cylindroid, finally tapering, of medium 

 size, and reach three-fourths the distance back to the vulva. The ova in them 

 are arranged single file. An ovum about to enter the oviduct is two to three 

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



Habitat: Sea-weed, Squibnocket, Martha's Vineyard, Mass., U. S. A.; Bathing 

 Beach, Wood's Hole, Mass., U. S. A.; not common. Examined living, in water. 

 Fig. 93. 



94. Onchulus longicaudatus n. sp. 1.6 



" 1 " Cuticle naked 



1.7 2.3 2- 



except for the setae on the head; its striae very difficult of resolution. Whether 

 the onchium is hollow and perforated remains uncertain, 

 but seems probable. Neck subcylindroid. The cylin- 

 droid oesophagus is at the nerve-ring three-fifths, and 

 finally three-fourths, as wide as the corresponding por- 

 tioh of the neck. Throughout its length, the colorless, 

 coarse musculature is interspersed with granular, gland- 

 ular tissues, as in Oncholaimus, making it seem probable 

 that the pharyngeal outlets are similar, but no duct has 

 been definitely established in the dorsal onchium. There 

 is a cylindroid cardia, about one-third as wide as the oe 

 base of the neck. Scattered setae having a length equal 

 to the breadth of two annules occur on the tail. There 

 are no caudal glands. The description is derived from a single young specimen 

 in which the vulva was not yet developed. The immature ovaries reached two- 

 thirds the way back to the location of the future vulva. 



Habitat: Soil about the roots of living plants imported from Brazil into the 

 United States. Flemming to glycerine jelly. Fig. 94. 



