1880.] NATURAL SCIENCES OF PHILADELPHIA. 7" 



Color flavus vel e rubro flavus. 



Dentes laterales (magni) hamo edentulo ; externi numero 10. 



Hab. Oc. Atlant. septentr. 



Of this form I have had for examination three specimens of nearly 

 equal size, kindly sent me by Prof. Moebius in Kiel, and caught in 

 the neighborhood of that town. 



The individuals wpre of a uniform whitish color, the liver shining 

 reddish-gray through the foot. Alder and Hancock have already re- 

 marked this shining through of the liver. The length was 7-0-8.0 mm., 

 by a breadth of 5.0-5.5, and a height of about 3.5 mm- ; the height of 

 the rhinophoria about 1.25, of the branchial leaves 0.75 mm. The 

 form nearly as in the Ad. pacijica, also the tubercles (fig. 12) of the 

 back and the surroundings of the rhinophor-holes ; the branchial 

 leaves nine to ten in number. The number of branchial leaves ac- 

 cording to Alder and Hancock is eleven, according to Meyer and 

 Moebius eight or nine. The rhinophoria with about fifteen to twenty 

 leaves. The lateral parts of the head nearly connate with the foot. 

 and only slight traces of true pointed tentacles. The foot as in the 

 next species. 



The three individuals were anatomically examined. The peritoneum 

 colorless. 



The central nervous system as in the Ad. pacifica, but less de- 

 pressed. The eyes and otocysts as in that species ; the last with 

 about 200 otokonia of very varying diameter, reaching about 0.02 

 mm. The spicula of the skin as described by English and German 

 authors ; a rather large quantity spread in the skin of the head. 



The bulbus pharyngeus (with the crop) of the length of about 1.5 

 mm., by a height of 1.5 and a breadth of 0.8 mm. ; the crop making 

 about half of the bulbus; the lip-disk with strong yellowish cuti- 

 cula ; the sheath of the radula a little prominent, bent more or less 

 upwards. The tongue narrow and pointed, with seven to nine rows 

 of teeth, further backwards thirty or thirty-one rows of developed and 

 three of younger teeth ; the total number thus amounts to forty or 

 forty-three.' 



The teeth as in the Ad. pacifica. The large lateral yellowish, the 

 rest nearly colorless. The length of the median teeth about 0.025 to 

 0.03 mm. '1 he large lateral (fig, 1366, 14) showed the prominence 



' Alder and Hancock notice forty-one, Meyer and Moebius tbirty-nine 

 rows of plates. 



