204 SCIENTIFIC RESULTS OF THE 
part of the sucking-crop of 5.5 mm.), and a breadth of 4.75 mm. ; 
the sheath of the radula projecting about 1.3 mm. backwards and 
downwards. The lip-disk large, clothed with a thick yellow cuticula ; 
the true mouth forming a narrow vertical slit. The cap-shaped suck- 
ing-crop almost exactly as in 4c. pilosa, but more conical and with- 
out external signs of duplication; on the inside clothed with a yellow- 
ish cuticula, opening inio the buccal cavity through a wide slit. The 
tongue rather broad; on the fine reddish-yellow colored radula seven- 
teen rows of teeth, also on the point of the tongue were traces of six 
entirely vanished rows; the two first rows very incomplete, reduced to 
some external plates. Further backwards were seen forty-two devel- 
oped and three younger rows, or, all in all, the animal presented sixty- 
two rows of teeth. The most external plate of each row is quite 
colorless, the next two or three pale yellowish, the following all of 
horny-yellow color; the rhachis colorless. The length of the most 
external plate about 0.035 mm., of the next- about 0.05 mm., of the 
following 0.07 mm.; the length of the second large plate about 0.2 
mm., of the first 0.022 mm.; the breadth of the rhachis about 0.22 
mm. The rhachis thickened between the rows and forming arched 
elevations between them (Pl. VI, fig. la, 3; Pl. VIII, fig. 1a). The 
first two plates rather large (Pl. VI, fig. 1bb, cc, 4-6; PI. VIII, fig. 
1b, c); with a short strong hook and a stout denticle at each side of 
it, the outer denticle broader; the hook of the second plate somewhat 
larger than that of the first; sometimes a slight crenulation on the 
outer margin of the first plate (fig. 5). All the following ten or eleven 
plates (Pl. VI, fig. 2e, 7; Pl. VIII, fig. 2a, b) of the same type, by 
degrees decreasing in size, consisting of a quadrilateral basal part, 
from which (Pl. VI, fig. 7-13), in most of them, rises a strong, short, 
broad hook ; the two or three outmost plates (Pl. VI, fig. 2/; Pl. VIII, 
fig. 2) formed of the basal part alone; the rest with the hook gradu- 
ally more developed. 
The salivary glands yellowish-white, flattened, ribbon-shaped, of 
about 10.5 mm. in length, reaching to the cardia, where they 
are agglutinated one to another; the breadth in the foremost part 
about 0.75 mm.,, in the middle 1.5 mm., the posterjor part again some- 
what narrower ; the duct of the gland rather short. 
The csophagus rather wide, about 13.0 mm. long, the inside with 
rather strong longitudinal folds ; it opens into the stomach, which lies 
free in a cleft on the upper side of the liver. This organ (PI. VI, fig. 
17a) is of oval form, of about 6.5 mm. largest diameter; the inside 
