



90 PROCEEDINGS OP THE ACADEMY OP [1879. 



The form resembled that of the typical species, the veil had two 

 median arbusculi, and on each side three lateral ones, the median 

 little larger than the laterals ; between the median a small, simple, 

 rather prominent papilla. A similar papilla seemed to exist be- 

 tween the two lateral arbusculi. Under the veil, on the upper lips 

 of the simple muzzle were a series of small, simple, truncate pa- 

 pillae; the most lateral one larger (representing the tentacle??). 1 

 The sheath of the rhinophoria high ; above this was the usual 

 larger branched appendage, divided at the top into five nearly 

 similar appendages ; the club not large, with about twenty rather 

 thin, and very broad leaves (on each side) mostly alternating in 

 breadth. 2 The body of the typical form had the arborescent pa- 

 pilla?, as in the typical species ; the two foremost pairs seemed 

 more branched and more divaricate, between them (in the region of 

 the heart) lower arborescent tufts. 3 Between the first and second 

 papillae of the right side was the large truncate anal prominence, 4 

 and at its root in front the very fine renal pore. The sides of the 

 bod} 7 were rather high ; the genital opening in the usual place in 

 front of the region of the first (dorsal) papilla, with two fine aper- 

 tures. The foot was rather narrow, scarcely divided from the 

 sides of the body ; the front end rounded, a groove between this 

 and the under part of the mantle. 



The cerebro-visceral ganglia were nearly as figured by Alder 

 and Hancock (1. c, lig. 9), the cerebral part a little larger than the 

 visceral ; the pedal ganglia more rounded, and the commissure 

 between them longer. The olfactory ganglia in the root of the 

 club of the rhinophoria were nearly spherical, rather large. The 

 buccal ganglia were of oval form, the commissure between them 



1 This is very likely the slight tentacular prolongation mentioned by 

 Alder and Hancock. Meyer and Moebius (Fauna der Kieler-Bucht. i., 

 1865, Taf. V. fig. ?>) neither mention nor represent any tentacles. 



2 Alder and Hancock mention in the D. arborescens "five or six large 

 plates and intermediate smaller ones." Meyer and Moebius (1. c, p. 43) 

 indicate twelve leaves. The number is still greater, reaching up to about 

 thirty. 



3 The animal examined had been mutilated by an enemy, the intestines 

 were all left intact, but the walls of the body failed from behind the second 

 papilla. 



4 Neither Alder and Hancock nor Mej r er and Moebius mention the situa- 

 tion of the anus. 



