232 DORIDID^. 



Doris pilosa, Muller. 



A specimen has been observed and imperfectly sketched by Dr. 

 Stimpson, which might well be referred to this species. It was 

 found at the Navy Yard, Charlestown, 1849. 



Doris grisea. 



Plate XX. Figs. 292, 295. 



Body oblong-oval, covered with blunt processes tipped with stellate clusters 

 of spiculte ; branchial plumes short, yellowish, arranged in a circle around a dark 

 bristle ; head short, broad, angular. 



Doris grisea, Stimpson, MSS. 



Body above oval-oblong, quite convex, and semi-globose when 

 contracted, a little pointed behind when fully extended ; back cov- 

 ered with short, blunt processes tipped with stellate clusters of 

 spiculge, many of them tipped with reddish browni, and with minute 

 farinaceous golden dots at their bases, producing on the whole a 

 general roseate aspect ; the sides somcwliat darker than the back. 

 Tentacles yellowish, long, blunt, nearly linear, the lower half simple, 

 the upper with ten or twelve fine oblique folds. Branchial plumes 

 3^ellowish, short, the posterior ones much shorter than the anterior, 

 arranged in a circle, the enclosed area brown, having a dark stilet 

 or bristle protruding from the centre. Head very short and very 

 broad, somewhat angidar, seeming to be attached to the mantle 

 only at the median line. Foot much narrower than the mantle 

 and more pointed behind, cream-colored. Motions quite active. 

 Length, one half inch ; breadth, one third of an inch. 



Found on floating Zostera in Charles River, November 9, 1842, 

 and on Fucus, Chelsea Beach, May, 1865 ; on the under side of a 

 fucus-covered stone at East Boston Point, in April {Simpson). 



This species is very closely allied to D. inconspicua, Alder and 

 Hancock, which lias a larger number of lamina? on the tentacles cov- 

 ering a greater length, and has ten plumes. D. aspera has also a 

 close general reseml)lance, but the tentacles are less clubbed and 

 with fewer laminoe, and the papillae are larger; the branchial plumes 

 are also more numerous. 



The figure is copied from an original drawing by Dr. Stimpson. 



