1880. J NATURAL SCIENCES OF PHILADELPHIA. 83 



Even this species might perhaps be merely a variety of the former ; 

 still it is of a quite different color and the back much more coarsely 

 j^ranulated, 



4 Adalaria albopapillosa (Dall). PL IX. H^. Ifi; PI. X, fig. 9-11. 



Alderia (? ?) albopapillosa, Dall, Amer. Journ. of Conch., vii, 2, 1873, 

 p. 137. 



Color pallide flavescens, papillis dorsalibus niveis. 

 Dentes laterales (magni) hamo basi denticulato. 

 Habitat. Oceanum Pacificum septentrion. (Sitka). 



Of this curious animal Dall caught three specimens [in company 

 with the Doris (Archidoris) Montereyensis and the jEolidia {Her- 

 missenda) opalesceiis'], in July, 1865, on algte, at the depth of six 

 fathoms, at Sitka (Alaska). 



According to the drawings of Dall, the color of the living animal is 

 very pale yellow,^ the back all over covered with chalk-white papillae ; 

 the length was 3, the breadth 2 lines. The three original specimens 

 preserved in spirits were of a length of 5.5 to 7.0 mm., of a gi-eatest 

 breadth of 4.0 to 4.5 mm., and a height of 2.75 mm. 1 he color was 

 uniformly translucent grayish and yellowish whitish. The form of the 

 animal was oval, the mantle a little larger than and hiding the rest of 

 the body. 'I he back convex, covered all over with a multitude of 

 cylindrical or fusiform, relatively rather large papilla?, reaching to the 

 height of a full millimetre, and with some few small ones spread 

 between them. The rhinophor-openings at their usual place, having, 

 as usual (with retracted organs *, thin margins ; before them always 

 two larger papillae, behind them a little naked space.^ The club of 

 the (yellowish) rhinophoria with about twenty-five leaves. The gill 

 rather small; the branchial leaves (yellowish), as usual, set in horse- 

 shoe form, lower or at least not higher than the dorsal papillte, in 

 number, ten to twelve ; the anal papilla rather low, with one of the 

 ordinary papilla? before and one behind it ; the space between the 



' "Of an opaque white, the remainder of the animal except the eyes, 

 being translucent yellowish." — Dall. 



- Dall did not detect the retracted rhinophoria ("tentacles none") ; the 

 "black eyes sessile on the anterior surface of the body, near the mantle 

 margin," did not exist in the figure, but in one individual two black sand- 

 particles were lying there. The true eyes of the animal could not be de- 

 tected through the skin, and were lying more backwards. 



