110 PROCEEDINGS OF THE ACADEMY OF [1879. 



meter, which were also visible on the under side of the mantle 

 edge and on the upper side of the foot. The sides were also 

 abundantly furnished with bright yellow points, appearing in 

 smaller number also on the back where they are, for the most part, 

 represented by yellow ocelli with darker yellow pupils. The man- 

 tle-edge had a yellow margin on the upper side ; there was also a 

 fine yellow line along the upper side of the edge of the foot. The 

 stalk of the rhinophoria was gray, the club (grayish) reddish. 

 The branchiae and tentacula grayish-white with a yellow colored 

 rhachis on the outer and posterior edge. 



The branchial leaves with a few scattered black points, the mar- 

 gin of the orifice for the rhinophoria and of the gill cavity embel- 

 lished with a yellow line. 



The form as usual; the mantle edge rather prominent, the 

 frontal and caudal veil not particularly developed (without traces 

 of larger nodules on the under side). The club of the rhinophoria 

 strong, with about thirty broad leaves; the tentacles conical (as 

 it seemed), retractile in a little cavity. The gill consisting of 

 fifteen (PI. XIII. fig. 1) simple plumes; increasing four times in 

 height from the posterior involute end gradually forward. The 

 angles of the anterior margins of the foot not very prominent. 



The intestines not shining through the walls of the body ; the 

 peritoneum colorless. 



The central nervous s}'stem .yellow. The cerebro-visceral ganglia 

 reniform, the two divisions of nearly equal size ; the rounded pedal 

 ganglia a little larger than each of them ; the great commissure 

 not short. The proximal olfactory ganglia of about the same size 

 as the distal (at the root of the club of the rhinophorium), larger 

 than the optic ganglion. The buccal ganglia (PI. XIV. fig. la) 

 larger than the olfactory, of oval form, connected by a rather short 

 commissure ; the gastro-cesojihageal (PI. XIV. fig. lb) rather short 

 stalked, developed on one side of the nerve, small about one- 

 eighth the size of the former, with one large and some smaller 

 cells. The nervi optici rather short. The eye with black pig- 

 ment and a yellow lens. The otoc3 r sts of about the same size as 

 the eyes, the number of otoconia not very large. The leaflets of 

 the rhinophoria and the tentacula without spicule, the skin of the 

 back and the interstitial tissue nearly so. 



The oral tube very large, about 2.0 mm. long by 2.2 mm. in 

 diameter, with strong, internal, longitudinal folds. 



