236 DOTONIDJE. 



The figure referred to is copied from an original drawing by j^Ir. 

 B. F. Nutting, the same used by Captain Coutliouy for the plate in 

 the Boston Journal. 



Family DOTONIDJE. 



Tongue narrow, teeth in a single central series. Tentacles 

 sheathed nt the base, retractile. Gills superficial, fusiform on the 

 sides of the back. 



Tlie armature of the lingual memln'ane in this family differs from 

 that of the other groups, in having a single central series of teeth, 

 and the tentacles are retractile, and furnislied with sheaths at their 

 bases. There are two genera, which inhabit the Laminarian Zone. 



Oenus DOTO, Oken. (1815.) 



Body elongated, without a mantle. Tentacles elongated, cylin- 

 drical, retractile into broad, trumijet-shaped sheatlis. Branchise 

 numerous, ovate or club-shaped, tubercular, in a single range along 

 each side of the back ; a small simple frontal veil. 



Doto coronata. 



Plate XVI. Figs. 233-237. 



Animal yellowish, dotted Avith red ; veil square in front ; branchiae five to 

 seven on eacli side, ovate club-shaped, bearing several circles of papillae with 

 dark red tips. 



Doris coronata, Gmelin, i. 310.5, No. 19. 



Tritonia coronata, Lamarck, An. sans Vert. (2d cd.) vii. 454. 



Tergipes coronata, D'Orb. in Mag. de Zool. 1837, v. pi. 103. 



Scilla'a punctata, BoucH. Chant. Moll, de Boul. 



Melibcea coronata, Joiinst. Ann. Nat. Hist. i. 117, pi. 3, figs. 5-8. 



MelihcEa ornata, Alder and Hancock, Ann. Nat Hist. ix. 34. 



Melibcea arhuscuhi, Agassiz, in Proc, Bost. Soc. Nat. Hist. iii. 119 (without descr.). 



Doto coronata, Loven, Arch. Skand. Nat. 151 ; Ind. Moll. Scand. 7 ; from Ofver. af K. 



Vet. Akad. YM\. 1846. — Stimpson, Mar. Inv. Gr. Manan, 26 ; Check Lists, 4 (1860). 



— Alder and Hancock, Monog. Niulib. Moll. Fam. 3, pi. 6 (Syn. D. pinnatifida, 



excl.). — Chenu, Man. de Conch, i. 409, fig. 3066. — Woodward, Man. of Mol- 



lusca, pi. 13, fig. 11. — Adams, Gen. ii. 70, pi. 65, fig. 5. 



Body slender, gradually tapering backwards, convex aliove, pale 

 rose-color thickly dotted with dark brown ; foot as wide as the 

 body. Tentacles thread-like, the sheath simple trumpet-sliaped and 



