( 



1879.] NATURAL SCIENCES OF PHILADELPHIA. 89 



The Dendronotidae differ externally vei'y distinctly from the 

 Scyllseidae and Bomellidae, especially in the form of the dorsal 

 papillae ; in the anatomical relations of the form of the mandi- 

 bular and by the character of the gl. hermaphrodisiaca, which is 

 not (as in the Dorididse) separate from, but connected with the 

 liver. 



Only two generic forms of the family have hitherto been known. 



1. Dendronotus, A. and H. 



2. Campaspe, Bgh. Naturkist. Tidssk., 3 R. J., 1863, pp. 471-478, Tab. 

 XII. figs. 1-17. 



DENDRONOTTJS, A. and H. 



The true Dendronoti differ from the Campaspae hy the much 

 more composite form of the frontal appendices, of the appendices 

 of the margin of the sheath of rhinophoria, and of the dorsal 

 papillae. The lateral teeth of the tongue of the former especially 

 are longer than in the Campaspae. 



Only a few species of the genus are hitherto known. 



1. J), arborescens (O. F. Muller). M. Atlant. 



2. D. luteolus, Lafont, Act. Soc. Linn, de Bord. 28, 1872. M. Atlant. 



3. D. robustus, Verrill, Amer. Journ. of Sci. and Arts, n. s. L., 1870, p. 



405. M. Pacif. 



4. D. iris., Cooper, Proc. of the Cal. Acad, of Sciences, ii. 1862, p. 59, 1863. 



M. Pacif. 



5. D. purpureus, Bgh. n. sp. M. Pacif. 



1. Dendronotus purpureus, Bergh, n. sp. Plate I. fig. 18-20 ; Plate III. fig. 7-12. 



Color purpureus. 



Dentes medianse (linguales) minutissime serrulati altamen non 

 usque iid apicem. 



Hab. M. Beringianum (Port Moller, Aliaska Peninsula). 



Only one specimen of this species was taken by Dall at Port 

 Moller on the north shore of Aliaska Pen., in September, 1874, 

 at a depth of seventeen fathoms, sand. He notes only that the 

 animal when living had the " mantle purple." 



The color of the alcoholic specimen, which was not in the best 

 condition, was reddish-brown, the head and foot yellowish. The 

 length of the (partly mutilated) animal was aparently about 20.0 

 mm. when perfect, with a height of the body of about 6.5 and a 

 breadth of nearly 5.0 mm. The height of the dorsal papillae 

 reached 3.0 mm. the breadth of the foot 3.5 mm. 

 7 



