BOLBOLAIMUS, ACANTHONCHUS 321 



the testes two-thirds, as wide as the corresponding portion of the body, but the 

 testes taper so that at their blind ends they are only one-half as wide as the body. 

 The various regions of the male sexual organs are separated from each other by 

 narrower channels. After synapsis, the spermatozoa grow and become granular. 

 Habitat: Sand, below low tide mark, Belmar, N. J., U. S. A. Sublimate to 

 balsam. Fig. lOOa, p.. 320. 



b. Bolbolaimus punctatus n. sp. r6~~~2."8/"" ; ~lT~ j~3 XJ* 1 *" Striae resolvable 

 into rows of dots, of which about every third row is a trifle coarser, thus indi- 

 cating the real width of the annules. Labial papillae six, setose, about one-third 

 as long as the cephalic setae. Around the mouth, there are fine, longitudinal 

 striations due to foldings in the vestibule. The punctate walls of the pharynx 

 are well-cutinized. There are two very small ventrally submedian projecting 

 onchia opposite the dorsal onchium. The oesophagus near the nerve-ring is 

 two-fifths, just in front of the cardiac bulb a little more than two-fifths, and 

 finally three-fourths, as wide as the base of the neck. This latter measurement 

 is the diameter of the somewhat elongated cardiac bulb, which is two-sevenths 

 as long as the neck. There is an obscure, elongated, two-parted valve in the car- 

 diac swelling, one-third as wide as the swelling m>[ 

 itself. The cardiac valve is divided into three 

 parts, corresponding to breaks in the muscula- on SU/ml 

 ture, the anterior part inconspicuous, the other 

 two each occupying nearly one-half the length n 

 of the bulb. The thick-walled intestine becomes 

 at once three-fifths as wide as the body. Its ^ 

 cross-section would present three to four cells, 

 containing scattered granules of variable size, / 

 the largest of which are about one-twenty-fifth 

 as wide as the body. Cardiac collum one-fourth 

 as wide as the base of the neck. From the con- $ 

 tinuous, inconspicuous anus, the rectum extends inward a distance two-thirds 

 as great as the anal body-diameter. The conoid tail tapers from the anus to the 

 blunt, conoid, symmetrical, unarmed spinneret. The broadly saccate caudal 

 glands lie behind and opposite the anus in the anterior half of the tail. Meas- 

 ured near the neck, the lateral fields are one-fourth as wide 'as the body. 

 The ellipsoidal, non-granular renette cell, one body-width behind the neck, is 

 one-half as long as the body is wide and five-sixths as wide as long. From the 

 small, inconspicuous, continuous vulva, the rather weak vagina extends inward 

 two-fifths the distance across the body. The elongated eggs are as long as the 

 body is wide and three-fourths as wide as long, and are packed three to five in 

 each uterus at once. The tapering ovaries contain about twenty ova arranged 

 single file. 



Habitat: Marine sand, Nobsca Beach, Woods Hole, Mass., U. S. A. Flemming 

 to glycerine jelly. Fig. 1006. 



101. Acanthonchus viviparus n. sp. There are distinct wings, whose presence 

 is indicated by about four to six longitudinal striations, resolvable, at least the 

 outer ones, into rows of dots. The wings extend from near the head to near 

 the tail. Neck conoid. Setae two- (or three-) jointed. The lip-region appears 

 to be divided into twelve parts, or into six parts, each of which is double. The 

 mouth cavity is cyathiform and shallow when the lips are closed and is entered 



