1880.] NATURAL SCIENCES OF PHILADELPHIA. Tl 



disk rather large, at the margin set with about fourteen papillae, 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-oesophageal 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. In the thin leaves of the rhinophoria no spicula. In the skin 

 of the back and in the dorsal papillas 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 papillse also were long, strong and very much calcified spicula, 

 often of uneven surface, whose points, as usual, often projected on the 

 surface of the papillie. 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 mm. 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 buccal cavity, clothed 

 with a rather thick, yellowish cuticula. Ihe 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. 

 1 he median pseudo-plates elongate, narrow (fig. 21) ; the true (lateral) 



' In the outer mouth was found a little Caprella, of the length of 3.0 mm. 



