286 ORDER SYNODONTIA 



finally two-thirds, as wide as the corresponding part of the neck. There are no 

 oesophageal bulbs, but there is a pyriform anterior segment of the intestine, 

 set off on both sides by a distinct constriction, in some ways resembling a cardiac 

 bulb. This pseudo-bulb is three-fourths as wide as the corresponding portion of 

 the body, as measured in alcoholic specimens. The lining of the oesophagus is 

 a prominent feature, and its optical expression consists in three refractive lines, 

 occupying a space one-fourth as wide as the entire organ. The oesophageal 

 musculature is coarse. At the cardiac constriction there are three elements, 

 questionably glands, each one-third as wide as the corresponding portion of the 

 body. There is no cardia. The thick-walled intestine has a very distinct refrac- 

 tive lumen and soon becomes five-sixths as wide as the body. The cells compos- 

 ing the intestine are about twice as long as he body is wide, and are so 

 arranged that each cross-section presents practically only two of them. These 

 cells are packed with exceedingly fine granules of more or less uniform size. The 

 tail is first conoid, then cylindroid in the posterior half. It tapers from in front 

 of the anus; the terminus has a contour more or less resembling that of a swan's 

 head. The simple, unarmed, symmetrical, blunt spinneret is half as wide as the 

 terminus. The three, broadly saccate caudal glands form a close tandem in the 

 anterior fourth of the tail. Their ducts and ampullae are distinct. There are 

 no caudal setae. The tail, like the body, is naked. The elongated renette cell 

 lies two to four body-widths behind the neck, and empties through a wide duct 

 separated from the ampulla by a constriction; the ampulla is one-fourth as wide 

 as the corresponding portion of the neck, and empties through a pore located 

 half-way back to the nerve-ring. The nerve-ring is accompanied by distinct 

 nerve-cells arranged in groups. From the somewhat large, more or less conspicu- 

 ous vulva, the large, rather muscular, cutinized vagina leads half-way across the 

 body. The straight uterus is about fourteen times as long as the body is wide, 

 and contains ellipsoidal eggs, each about as long as the body is wide, which are 

 deposited after segmentation begins, in fact, the species may be viviparous. 

 Fully-formed embryos occur in the eggs near the vulva. Spermatozoa, half as 

 wide as the body of the female, and with strong refractive nuclei, occur in the 

 uterus. There is a rather narrow, ventral posterior rudimentary part to the 

 female sexual organ, about one and one-half times as long as the corresponding 

 portion of the body is wide. The ovary is nearly cylindroid, but tapers slightly, 

 and contains numerous ova arranged single file. Toward its blind end, it sud- 

 denly narrows, and is reflexed, or thrown into an "S" form, in a space one to two 

 times as long as the body is wide; here it is only one-sixth as wide as the body. 

 The rather frail, somewhat simple, rather slender, subacute spicula are one and 

 one-half times as long as the anal body diameter. At their widest part near the 

 middle, they are about one-sixth as wide as the corresponding portion of the body. 

 Their proximal ends appear to lie dorsad from the body-axis. The single, frail, 

 very slender, more or less arcuate, accessory piece is somewhat removed from the 

 spicula, at least from the refractive part. Its proximal extremity lies dorsad 

 from the body-axis. There are no supplementary organs. About ten pairs of 

 papillae occur on the tail of the male. These are very inconspicuous and are 

 arranged as follows: one ventral, single, and two submedian pairs just in- front 

 of the anus; third, fourth, fifth and sixth pairs behind the anus, opposite the two 

 anterior caudal glands; seventh and eighth, lateral, opposite the posterior caudal 

 gland; ninth and tenth farther back, not so close together, averaging about twice 

 as far from the anus, as the seventh and eighth. There is a rudimentary bursa; 

 i.e., there are submedian longitudinal elevations of considerable magnitude 



