412 PROCEEDINGS OF THE NATIONAL. MUSEUM vol.85 



The genital markings have a circular or transversely oval outline 

 and usually are slightly protuberant. Each marking usually com- 

 prises an opaque rim and a central, grayish-translucent, circular por- 

 tion, but occasionally the rim appears to be lacking. The mai-kings are 

 located on segments vii-xiii on the new specimens as follows : 



1. Segment viii — anterior annulna, left side, just lateral to the spermathecal 

 pore ; ix — posterior annulus, left side, iu be but nearer to b than to c; x — pos- 

 terior annulus, right side, just lateral to lateral margin of the male porophore. 



2. Segment vii — posterior annulus, right side, lateral to sperms thecal pore; 

 viii — anterior annulus, each side, just lateral to the spermathecal pore; ix — 

 middle annulus, right side, in he. 



3. Segment viii — presetal, right side, in bo just behind the spermathecal pore; 

 ix — presetal, right side, in be; x — presetal, left side, in. be; xi — presetal, right 

 side, in be. 



4. Segment viii — presetal, left side, in be slightly median to the spermathecal 

 pore; ix — presetal, left side, in be; x — presetal, right side, in be; xi — presetal, 

 left side, in aa; xii — presetal, left side, in oa; xiii — postsetal, median. 



5. Segment viii — postsetal, right side, in ab; ix — presetal, left side, in ab. 



6. Segment ix — presetal, right side, in be; x — presetal, left side, in be. 



Internal anatomy. — Septa 5/8-8/9 are thickly muscular; 9/10 thin 

 and displaced posteriorly. The last pair of hearts is in ix. There is 

 a band of opaque material on each side of the dorsal blood vessel. 



The gizzards are two, in xii-xiii (2 specimens) or three, in xii-xiv 

 (4 specimens). 



The testis sacs are ovoidal or kidney-shaped, in the latter case the 

 concave side directed ventrally; in ix and x, unconstricted by 9/10. 

 The vas deferens is short, rather thick, relative to size of the worm, 

 in 9/10 with several loose loops into ix and x. The vas passes pos- 

 teriorly on the parietes in segment x and into the body wall at a point 

 slightly median to the entrance of the prostate into the parietes. The 

 prostates are shortly club-shaped and erect ; the entalmost portion may 

 be two to three times as thick as the more ectal coelomic portion. 

 Removal of the external glandular layer reveals a whitish, slenderly 

 tubular, central body. In none of the specimens examined is there any 

 widening of the ental end of the central body to correspond to the 

 ental thickening of the external glandular layer. 



Segment xi is reduced to a closed-off ovarian chamber of horseshoe- 

 shape. The laterally flattened ovisacs appear to terminate, at first 

 glance, in the region of segments xiv-xvii. If, however, the gut is 

 carefully rolled over to one side a long slender rodlike body can 

 be seen in the vicinity of the nerve cord on each side. This can be 

 traced anteriorly into the region of segments xvii-xiv, where it 

 passes dorsally at the side of the esophagus and gradually or abruptly 

 merges into the wide portion of the ovisac. Thus, in reality, the ovi- 

 sacs extend posteriorly into xxvi-xliii, xxvi (1 specimen), xxxvii and 

 xli (1 specimen). In one worm the rodlike appendix of one side passes 



