290 



ORDER SYNONCHIA 



circle on the inner wall of the pharynx, dividing it into two more or less distinct 

 parts; nevertheless, the inner contour of the pharynx is rather regular on the 

 whole. Neck cylindroid. Oesophagus plain, except that there is a pyriform 

 bulb surrounding the pharynx, tapering gradually into the oesophagus, which is 

 at first two-thirds, at the nerve-ring one-half, and finally two-fifths, as wide as 

 the corresponding portion of the neck. There is a more or less cylindroid cardia 

 one-third as wide as the base of the neck. The thick-walled intestine has a 

 distinct lumen, and becomes at once two-thirds as wide as the body. Cardiac 

 k collum one-half as wide as the body. The scattered, rather uniform yellow 

 seHphestrW mnd \lat setcphJntr(6> -'f--^ ---^| - -^ _->i.4.. granules, 



found in the 



LI v-A25. _ -*-' __.9i. ?18 intestinal 

 1-4 ll7 1-8 2 ' 2 ~* 1>6 cells, are less 



than half as wide as one of the annules. 

 From the continuous anus the more or 

 less cutinized rectum extends inward a 

 distance hardly as great as the anal body 

 diameter. The conoid tail tapers from 

 the anus, near which, in the anterior third 

 of the tail, the three ellipsoidal, caudal 

 glands lie in a close tandem. There are 

 very few, inconspicuous, slender, taper- 

 ing, acute, dorsally submedian caudal 

 setae. Renette unknown. The nerve- 

 ring surrounds the oesophagus obliquely and is accompanied by obscure nerve 

 cells. From the large, conspicuous vulva, the large, tubular, muscular, cutin- 

 ized vagina extends forward a distance equal to the width of the body, where it 

 joins the straight uterus, which is six times as long as the body is wide and con- 

 tains eggs two and one-half times as long as the body is wide, and one-third as 

 wide as long, if one may judge the size of the eggs from that of a full-grown 

 ovum. There is a spermatheca extending forward a distance five to six times 

 greater than the body diameter, the extent of which is plainly indicated by the 

 definite contour of its blind end. The rather narrow, tapering ovary contains 

 about twenty ova arranged single file. The spicula are slender, uniform, and 

 acute. Their spherical proximal ends appear to lie dorsad from the body-axis. 

 The two, separate, slender, acute, strong accessory pieces have proximal parts 

 that appear to envelop the spicula. There are no pre-anal ventral supplemen- 

 tary organs, or special papillae. The ejaculatory duct is one-third as wide as the 

 body. The narrow, cylindroid testes finally taper to a width two-fifths as great 

 as that of the body. 



Habitat: Eel-grass, Woods Hole, Mass.; also Belmar, New Jersey, U. S. A. 

 Sublimate to balsam. Fig. 72. 



X750 



97.2 



> 1.3 ., 



There 



7-5 . 15- 61 



............... - 



73. Synonchium obtusum n. sp. ^ 3>5 ' 3 - 6 Tere are no 



wings. On the lateral fields, which are about one-fourth as wide as the body, 

 the secondary elements of the annules become scattered and coarser, and oval 

 or elongated in contour. There are two laterally submedian, irregular rows of 

 pores, one to two times as wide as the annules, lying along the margins of the lat- 

 eral fields, and separated from each other transversely by a distance about equal 

 to one-fourth the width of the body; measured in a longitudinal direction, the 

 distances between the pores are about the same, but somewhat irregular. These 

 pores have a special arrangement on the tail. (See illustration.) Neck cylin- 



