220 SCIENTIFIC RESULTS OF THE 
disk rather large, at the margin set with about fourteen papilla, irregu- 
larly alternating in size. The branchia composed of twelve small 
leaves of the usual kind. The centre of the disk and the anus as 
usual. The foot somewhat shorter and narrower than the back, 
broader in front, with the anterior margin rather straight, rounded 
posteriorly. 
The cerebro-visceral ganglia showed the visceral part a little larger 
than the cerebral, the pedal somewhat smaller than the visceral; the 
four commissures as usual; the offshoot of the nerva genitalis could 
not be determined. The buccal ganglia rounded, connected through a 
short commissure ; the gastro-cesophageal having about one-quarter of 
the size of the latter. ; 
The eyes with very rich black pigment ; the nervus opticus not short. 
The otocysts as large as the eyes, filled with otokonia of the usual 
kind. Inthe thin leaves of the rhinophoria no spicula. In the skin 
of the back and in the dorsal papilla an enormous amount of irregular 
or rounded particles, often coalescing together in larger, irregular 
lumps, which very often were crowded together in irregular heaps ; in 
the papille also were long, strong and very much calcified spicula, 
often of uneven surface, whose points, as usual, often projected on the 
surface of the papilla. In the interstitial connective tissue, including 
the ends of the different ducts of the genital organs (vagina, mucous 
gland duct), masses of large and long (as much as 0.9 mm.), calcified 
spicula. 
The mouth-tube was about 1.0 mn. long, rather wide, with strong, 
longitudinal folds. ‘The bulbus pharyngeus of usual, irregular form, 
the bulbus proper of the length of about 1.75 mm.; the sheath of the 
radula, nearly as long as the bulbus, curved downwards. The labial 
disk oval, at the inner margin of darker color, and there showing 
(fig. 17) a narrow belt of small, yellowish denticles, of a height of 
0.007 to 0.015 mm. ;! this belt seems continued a short space up in 
the mouth that is otherwise, like,the rest of the buceal cavity, clothed 
with a rather thick, yellowish cuticula. ‘The tongue rather long and 
narrow, in the groove on its back sixteen rows of teeth, in the sheath 
eighteen developed and six undeveloped rows, the total number conse- 
quently forty. The color of the true lateral teeth yellowish, the others 
nearly colorless ; the height of the outer pseudo-plates about 0.075 mm. 
‘| he median pseudo-plates elongate, narrow (fig. 21); the true (Jateral) 
! Tn the outer mouth was found a little Caprella, of the length of 3.0 min. 
