236 dotonidj:. 



The figure referred to is copied from an original drawing by Mr. 

 B. F. Nutting, the same used by Captahi Cuuthouy for tlic plate in 

 the Boston Journal. 



Family DOTONID^E. 



Tongue narrow, teeth in a single central series. Tentacles 

 sheathed r.t the base, retractile. Gills superficial, fusiform on tlio 

 sides of the back. 



The armature of the lingual membrane in this family differs from 

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

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

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



Oeuus DOTO, Okex. (1815.) 



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

 drical, retractile into broad, trumpet-shaped sheaths. Branchige 

 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 with red; veil square in front; branchiae five to 

 seven on each side, ovate club-shaped, bearing several circles of papilke with 

 dark red tips. 



Doris coronata, Gmelin, i. 3105, No. 19. 



Tritonia coronata, Lamarck, An. sans Vert. (2d cd.) vii. 4.54. 



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



Scillica punctata, Boucii. Chant. Moll. dc. Boul. 



Melibaea coronata, Johnst. Ann. Nat. Hist. i. 117, pi. 3, figs. 5-8. 



^Tdihiva ornatii. Alder and Hancock, Ann. Nat Hist. ix. 34. 



Melihm arhnscula, Ac.ASsiz, in Proc. Post. Roc. Nat. Hist. iii. 119 (without dcscr.). 



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



Vet. Akad. Fork. 1846. — Stimpsox, M:n-. Inv. Gr. Manan, 26 ; Check Lists, 4 (1860). 



— Alder and Hancock, Monog. Nudil). Moll. Fani. 3, pi. 6 (Syn. D. pinnatifida, 



excl.). — CnENU, Man. tie Conch, i. 4()0, fig. 3066. — Woodward, Man. of Mol- 



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



Body slender, gradually tapering backwards, convex al)Ove, pale 

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

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



