X44 PROCEEDINGS OF THE NATIONAL MUSEUM vol. io» 



at a depth of 10 feet and a distance of 300 feet from shore on July 20, 

 1948; 2 were dredged from a sandy bottom at a depth of 10 to 15 

 feet and a distance of 75 to 150 feet from shore on Sept. 8, 1948; and 

 3 (34 by 22 by 13 mm., 34 by 21 by 13 mm., and 30 by 21 by 12 mm.) 

 were washed ashore on Oct. 16, 1949. 



These animals were white, with a cream colored foot; the gonads 

 showed through as buff, the gut as black. The entire dorsum is 

 covered with small papillae from which fine lines radiate. The 

 mantle extends beyond the foot all around. The rhinophores are 

 located unusually far back and the branchiae very far back on the 

 dorsum. The 12, equal -sized branchiae are in a ring with the anal 

 pore in the center; anal papilla short or absent. 



Distribution: Point Barrow, Alaska; and (Lemche, 1941) north- 

 ern and eastern Iceland (in deep water), Finmarken, and other 

 European waters; and (Odhner, 1907) Shetland, and the Azores. 

 It is new to North America. 



Division Aeolidiacea (=Cladohepatica) 



Family Dendronotidae 



Genus Dendronotus Alder and Hancock, 1845 



Dendronotus frondosus (Ascanius, 1774) 



Pl.^^TE 3, FIGURE 1 



Amphitrite frondosa Ascanius, 1774, p. 155, pi. 5, fig. 2. 



Doris arborescens Miiller, 1776, p. 229, pi. 101, figs. 1-4. 



Dendronotus arborescens Alder and Hancock, 1845-1910, vol. 2, p. 161; fam. 3, 



pi. 3; Suppl., pi. 47, fig. 2. 

 Dendronotus frondosus G. Sars, 1878, p. 314. — Odhner, 1907, p. 64. — Lemche, 1941, 



p. 23. 



Twenty specimens were collected: 2 were dredged at a depth of 

 140 feet on Aug. 21, 1948; and 1 at a depth of 150 feet on Aug. 23, 

 1949; the remaining 17 specimens washed ashore between Sept. 12 

 and Oct. 5, 1949. The largest specimen (from 140 feet) was 115 mm. 

 long; the next largest (washed ashore on Sept. 12) was 95 mm. long, 

 25 mm. wide, and 27 mm. high, and the maximum length of the cerata 

 was 21 mm. 



These specimens were a rich, reddish brown on a cream background. 



Distribution: Point Barrow, and Bering Sea; and (Lemche, 1941) 

 the east coast of North America (Labrador to Cape Cod), western 

 and eastern Greenland; northern and eastern Iceland, the Faroes, the 

 Shetlands, Spitzbergen, Franz Josef Land, northern and southern 

 Norway, and other European waters south to France. It is new to 

 the western Arctic. 



