104 PROCEEDINGS OF THE ACADEMY OF [1880. 



The form elongate-oval. The back covered all over with irregular 

 (the greatest height reaching about 1.5 mm.), conical, rather soft and 

 flexible papillte, in general larger than in the typical species. The 

 margin of the rhinophor-holes thin, somewhat prominent, with two 

 anterior strong tubercles and a posterior much smaller one ; the stalk 

 of the club rather low, the latter with about twenty-five to thirty leaves. 

 The branchia consisting of nine to ten leaves, the adjacent border set 

 with several strong tubercles ; the branchial leaves quite isolated at 

 their base, apparently simply pinnate. The anus prominent, before 

 the same a small tubercle, behind it a much larger one. The margin 

 of the mantle rather thin, on the upper side covered with a mass of 

 smaller and larger papillse and tubercles, the under side smooth. The 

 head broad, flat, with prominent rounded, flattened tentacula. The 

 foot broad, rounded behind. 



The central nervous system as in the typical species ; the buccal 

 ganglia rounded, the commissure between them very short. The eyes 

 with black pigment and yellow lens. The otocysts a little smaller 

 than the eyes, with numerous otokonia of the usual form, and reaching 

 a length of 0.03 mm. The leaves of the rhinophoria without spicula ; 

 in the axes of the organs large, molecularly calcified cells and groups 

 of smaller calcified cells. In the papillae of the skin of the back were 

 no spicula at all, on their surface the usual large quantity of glandular 

 cells ; in the skin beneath the papillte cells and groups of cells as in the 

 case of the rhinophoria. 



The mouth-tube rather wide, with strong cuticula. The bulbus 

 pharyngeus formed apparently as in the typical species ; the lip-plate 

 composed of many rows of rather low (the height rising to about 

 0.02 mm.), very (fig. 6) finely striated columns. The tongue with ten 

 rows of teeth ; further back, twenty-six developed and three undevel- 

 oped rows ; the total number thus thirty-nine. The lateral plates 

 large, yellow, of usual form, with a series of denticles along nearly 

 the whole of the inner margin of the hook (fig. 16a). The external 

 plates colorless, eight in number; somewhat depressed (fig. 7, 16), 

 obKquely rising from the cuticula of the tongue (fig. 7), of nearly equal 

 size excepting the outermost (fig. 16&), which is much smaller. 



The salivary glands seemed of the usual form. The oesophagus and 

 the stomach as usual. The intestine issuing from the liver at the 

 middle of its length on the left side, rather short. The liver of the 

 length of about 9.0 mm. by a breadth and a height of about 4.2 mm. ; 



