FREE-LIVING NEMATODES 13 



bodies that stain, of which those most clearly seen were the dorsal and ventral 

 ones. Probably there is a circlet of these bodies. Just behind these stained 

 bodies, that is, a little behind the setae, there is an appearance as if of a small 

 quadrate cavity, one-third as wide as the head. This is not a cavity, however. 

 Its posterior limits are a trifle more than a head-width from the anterior end. 

 The amphids are variable in size and form,. being considerably larger and slightly 

 more elongated in the male. The posterior border appears interrupted. The 

 slender cylindroid oesophagus, is probably very obscurely Rhabditoid, and ends 

 posteriorly in an obscurely rhomboidal to pyriform bulb or swelling, three-fifths 

 to two-thirds as wide as the neck. The cylindroid cardia, one-fourth as wide as 

 the body, and twice as long as wide, is really a modified part of the intestine, and 

 is composed of small strongly staining cells. The thick walled intestine, sepa- 

 rated from the oesophagus by a collum one-fourth to two-fifths as wide as the 

 neck, is few, probably four, cells in girth. These cells contain numerous, indis- 

 tinct, rather fine and uniform granules. 



The tail, tapering from the anus, is cylindroid in the posterior two-fifths and 

 ends in an almost imperceptibly swollen apiculate terminus one-third to one-half 

 as wide as the base. The caudal glands are arranged in loose tandem in the an- 

 terior half of the tail; their ampullae are distinct and no wider than the ducts, 

 but stain more strongly. The elongated renette-cell, which is difficult to observe, 

 is as long as the body is wide, and one-fifth as wide as long, and occurs at a dis- 

 tance behind the neck equal to eight times the width of the body. The very 

 slender duct, invisible except where stained, empties through a pore apparently 

 opposite the nerve-ring. The nerve-ring surrounds the oesophagus rather squarely 

 and is accompanied by somewhat distinct nerve-cells rather definitely grouped. 

 From the inconspicuous, small continuous vulva the small vagina leads inward 

 halfway across the body to the straight uteri. The rather elongated eggs are 

 two to two and one-half times as long as the body is wide, and fully one-third as 

 wide as long. The broad ovaries, cylindroid, but tapering near the extremities, 

 reach three-fourths of the way back to the vulva, and contain about twelve ova, ar- 

 ranged rather irregularly. The spermatozoa in the uterus are of such a size that 

 it would take at least seven or eight side by side to equal the body-diameter. 



The arcuate, rather strong, sub-slender, sub-acute spicula, one and one-fourth 

 times as long as the anal body-diameter, are slightly cephalated by expansion, 

 the cephalum being set off by a broad shallow constriction, and lie with their 

 proximae dorsal to the body-axis. There are two rather strong, sub-slender, 

 slightly bent accessory pieces, parallel to the spicula then bending away, the 

 applied part being one-fourth as long as the spicula. The receding part is arcuate 

 in the same direction as the spicula, and from its end there passes a strand of 

 muscle to the ventral body-wall behind the anus. The ejaculatory duct is one- 

 fourth, the vas deferens and cylindroid testes one-half as wide as the body. The 

 blunt blind ends of the testes are two-thirds of the neck's length from the cardia 

 and one and one-half times the tail's length from the anus, respectively. 



The protrudable, sub-equidistant supplementary organs are separated by a 

 distance equal to nearly one and one-fourth times the body-diameter, and the 

 posterior one is located at a distance in front of the anus equal to twice the anal 

 body diameter. They are rather straight but have the distal third bent ven- 

 trally, and the distal end flattened and pulled out posteriorly into a spur, or 



