1879.] NATURAL SCIENCES OF PHILADELPHIA. 123 



and the number of denticles did not much increase, after which 

 both gradually increased as usual (figs. 11-13). Still the number 

 of denticles in the individual examined hardly exceeded 18-22, 

 and was still smaller in the outer portion of the rows (fig. 15). 

 The three or four outer plates were of rather variable form (figs. 

 14-15) generally without denticles or only traces of them (figs. 

 14aa, 15a). 



The salivary glands were yellowish, flattened, riband-shaped, 

 10.0 mm. long, with a greatest breadth in the anterior part of 1.0 

 (fig. 20) ; the glands adhering to one another through more than 

 the posterior half; the ducts short (fig. 20a). The oesophagus 

 about 9.0 mm. long, rather thin, and somewhat broader in the 

 middle. The stomach narrow. The intestine appeared at the 

 surface of the liver behind the middle of that organ, was about 

 5.5 mm. long, reaching to the second fifth of that organ. The 

 reflected part was about 14.0 mm. long, and the alimentary cavity 

 was empty. 



The liver 14.0 mm. long, reaching G.O mm. in breadth and 5.3 

 mm. in height. The posterior end rounded, somewhat pointed, 

 more than half the right anterior portion flattened for the anterior 

 genital mass. The surface was gra} r ish-yellow, the substance 

 deeper yellow. The vesica fellea smaller than in the typical 

 species, appearing at the right side of the pyloric part of the in- 

 testine with a rounded upper end about 1.5 mm. in diameter. 



The heart as usual. The sanguineous gland whitish, flattened ; 

 about 6 mm. long, with a breadth in the posterior half of 3.5 mm. 

 in the anterior of scarcely 2.0 mm., its thickness about 0.5 mm., 

 covering the largest part of the central nervous system. The 

 urinary chamber large. 



The hermaphroditic gland yolk-yellow, spread over the fore- 

 part of the liver, over the anterior part of its upper side and over 

 the lateral parts of this organ ; in its lobules were large oogene- 

 cells. The anterior genital mass large, about 9.5 mm. long, nearly 

 6.5 mm. high, and 4.5 mm broad, oval plano-convex. The yellow- 

 ish hermaphroditic duct issued from about the middle of the 

 applanation on the forepart of the liver, rather strong, swelling 

 into the } r ellow ampulla that runs in short windings over the left 

 side of the anterior genital mass to its anterior end ; the length 

 of the unrolled ampulla was about 9.0 mm., its diameter only 0.1 

 mm. The spermato-duct with its windings resting on the ante- 



