472 PROCEEDINGS OF THE NATIONAL. MUSEUM vou 85 



Internal anatomy. — Septa 5/6-7/8 are thickly muscular; 8/9-9/10 

 lacking; 10/11-12/13 thickly muscular; 13/14 muscular. 



On the esophagus immediately behind the gizzard there is a con- 

 spicuous, lobed, glandular collar. The intestine begins in xv on 

 the right side, in xvi on the left side. The intestinal caeca are 

 simple. 



The single commissure of ix is on the left side. The last pair of 

 hearts is in xiii. All hearts of ix-xiii pass into the ventral blood 

 vessel. 



The testis sacs of x and xi are unpaired and ventral. The seminal 

 vesicles of xi and xii are vertical bodies reaching into contact with 

 the dorsal blood vessel. Each vesicle is provided with a rather 

 conelike, very smooth, primary ampulla, which is sunk into the 

 dorsal margin of the ventral lamina. There are paired pseudo- 

 vesicles in xiii and xiv. The prostates are relatively rather small; 

 the right prostate confined to xviii though 17/18 and 18/19 are dis- 

 located anteriorly or posteriorly; a small lobe of the left prostate 

 extending into xvii. The prostatic duct is about 12 mm long, bent 

 into a hairpin-shaped loop, the ectal limb of the loop thicker than 

 the ental. 



The spermathecal ampulla is about as long as or slightly longer 

 than the duct. The latter is stoutish and with a rather bulbous 

 appearance as it passes into the parietes. Within the body wall the 

 duct is very abruptly and very considerably narrowed; the very 

 short, slender portion of the duct opening to the exterior by a mi- 

 nute pore on the ventral face of a tiny, smooth, rather conical tuber- 

 cle on the roof of the spermathecal invagination. The spermathecal 

 invagination, transversely slitlike in section, is confined to the outer 

 half of the rather thick body wall. On the anterior face of the 

 spermathecal duct, close to the parietes is a spheroidal, glandular 

 mass. A bundle of stalks or ducts from this gland passes through 

 the parietes on the anterior face of the spermathecal duct to a cir- 

 cular genital marking located on the anterior wall of the spermathe- 

 cal invagination. The junction of the diverticular stalk with the 

 spermathecal duct close to the parietes is concealed from view by 

 the anterior gland. The diverticulum comprises a smooth, glisten- 

 ing stalk and a much wider seminal chamber, the latter with two 

 or three slight constrictions. 



Just median to each prostatic duct a glandular mass projects con- 

 spicuously into the coelomic cavity. This mass is elongate, sau- 

 sage-shaped, but this is not at first obvious, for a portion of the 

 gland passes in an anteroventral diagonal fashion deep into the 

 parietes. From the ventral face of this mass numerous cords or 

 ducts pass posteriorly within the longitudinal musculature. 



