1879.] NATURAL SCIENCES OF PHILADELPHIA. Ill 



The bulbus pharyngeui 2.5 mm. long by 2.0 mm. broad and 

 high. The radula reddish-gray, freely projecting about 2.5 mm. 

 The armature of the lip-disk broad, rather thick, fine horny-yellow, 

 consisting ( PI. XIII. fig. 2) of rather long (0.06 mm.) hooks, some- 

 what curved at their upper ends and slightly bifurcated at the 

 point (fig. 3). 



The tongue as usual, with about forty rows of teeth, behind 

 which were sixty-six rows of developed, and six rows of immature 

 teeth, the total number being one hundred and twelve. The teeth 

 of yellowish color, except the rhachidian and external uncini, 

 which were nearly colorless. The height of the second lateral 

 (PI. XIV. fig. 2) about 0.035 mm., of the most elevated teeth about 

 0.05 mm., of the outermost uncini 0.025 to 0.03 mm. On the 

 narrow rhaehis was a median pseudo-plate (rhachidian boss) 

 about 0.035 mm. long, pointed anteriorly (PI. XIII. fig. 4; PI. XIV. 

 fig. la) broader and rounded behind (PI. XIII. fig. 5) consisting of 

 a high anterior portion which falls abruptly toward the plain part, 

 slopes gradually towards the fore-end, and is divided by a longi- 

 tudinal groove into two halves (figs. 4, 5). On each side of the 

 median plate twenty-seven to twenty-nine laterals. The lateral 

 teeth of usual form, somewhat low; the (PI. XIV. fig. 2) first with 

 four to five denticulations on each side of the low hook; the rest 

 (figs. 6, 7, 8) with such only on the outer side, mostly with six to 

 seven, more rarely (especially on the inmost plates) with four to 

 five, or at the utmost with eight to nine denticles ; the six outer- 

 most of the usual aberrant form, without denticulations (PI. XIV. 

 fig. 3). 



The salivary glands long, ribband-shaped, whitish. The oeso- 

 phagus as usual ; the intestine filled with large pieces of a Cera- 

 tospongia, mixed with some fragments of the lip-plates and some 

 teeth from the radula. The liver about 6.0 mm. long by 3.0 mm. 

 broad and high, truncate at the fore-end, rounded behind; the 

 substance yellow. 



The renal layer rather thick. The sanguineous gland whitish. 



In the cavities of the hermaphroditic gland were zoosperms. 

 The anterior genital mass about 3.5 mm. long by a height of 3.0 

 and a breadth of 2.0 mm. The ampulla of the hermaphroditic 

 duct rather (about 2.5 mm.) long, yellow. The spermatoduct very 

 long; the first, darker, part forming a large flattened coil, the 

 second passing into the short penis. The spherical spermatotheca 



