98 PROCEEDINGS OP THE ACADEMY OF [1880. 



The salivary glands deeply imbedded in the cavity for the oesophagus 

 at the fore-end of the liver. The oesophagus with its rather large 

 (1.5 mm. long) diverticle, the stomach, the intestine with its little 

 (1.0 mm. long bag, as above. The liver 7.0 to 9.0 mm. long, 5.0 to G.O 

 mm. broad, 5.0 to 6.25 mm. high, of yellowish-gray color. The san- 

 guineous gland of irregular, oval form, of a largest diameter of 4.0 

 mm., by a thickness of 1.0 mm., and of grayish color. The renal syrinx 

 about 0.75 mm. long. 



The anterior genital mass Q.O or 7.0 mm. long, 4.0 to 6.0 mm. high, 

 and 3.0 or 4.0 mm. thick. The ampulla as usual; also the (about 

 40.0 mm. long) spermatoduct and the (nearly 2.0 mm. long) penis, 

 with its armature ; the hooks often set in pairs. The spermatotheca 

 (diameter, 4.0 mm.) and the spermatocysta (diameter, 1.5 mm.) as 

 above ; the chief duct, with the vagina (about 23.0 mm. long, by a 

 diameter of 0.4 to 1.0 mm.), as usual, and also its internal cellular 

 clothing (PI. X, fig. 13) ; the yellow nucleoli somewhat brighter; the 

 cavity nearly filled with sperma. The mucous gland as usual. No 

 black pigment on the inferior part of the vagina or on the penis. 



S. Acanthodoris pilosa (0. F. MUller), mr. purpvrea, PI. XII, fig. 1-9. 



Color e purpureo brunneus et flavescente-albidus. 

 Habitat. Oceanum Pacificum septentrion. Insula? Aleutiana? (Una- 

 lashka). 



Only two specimens of this species were dredged by Dall, in Sep- 

 tember, 1874, on mud and stones, at a depth of about sixty fathoms. 



The color of the living animal was, according to Dall, '■ purple-brown 

 and jellowish-white." The length of the animals preserved in spirits 

 was 24.0 or 25.0 mm., by a breadth of 9.0 or 10.0 mm., and a height 

 of 7.5 mm.; the foot 6.0 mm. broad; the height of the rhinophoria 

 about 3.0 mm., of the branchial leaves 2.3 mm. The color of the 

 back reddish-brown ; the stalk of the rhinophoria brownish, the club 

 yellowish ; the branchial leaves yellowish-white, the last brownish at 

 the rhachis ; the under side of the mantle margin, with the sides of 

 the body, the head and the foot, yellowish-white, dotted with brownish- 

 gray all over, the color much more scanty on the sides of the foot and 

 still more so on the head and on the sole of the foot. 



The form was somewhat elongate. The back covered all over with 

 pointed, rather (0.75 mm ) high, digitiform, soft papilla3 and with inter 

 mixed smaller ones. The margin of the rhinophor-holes with several 

 pointed, projecting, digitiform processes ; the stout club of the rhino- 



