234 tritoniidj:. 



Very like to A. cristata, Loven, differing chiefly in its greater 

 size, longer oral tentacles, the lower ori- 

 gin of the tentacular processes, and the 

 greater number of branchial laminte. 

 Ova in a tape-like envelope, adhering to 



Ova of A. sulphurea. , , ^ • ^ 



rocks by one edge, m a loose, serpen- 

 tine manner. Some specimens are tipped with brown instead of 

 yellow. 



The figure referred to is from a drawing by Dr. Stimpson. 



Family TRITONIIDiE. 



Tongue broad, teeth many in each cross series ; jaws horny. 

 Tentacles retractile within sheaths. Gills superficial, fusiform, or 

 branched, on each side of the back. Vent lateral. Foot linear, 

 channelled. 



Many of the genera of this family arc pelagic, and are often found 

 crawling on the fronds of floating alga?, or clinging to the narrow 

 stems of gulf-weed, which is frequently met with in large masses at 

 considerable distance from the land ; these mimic forests, tenanted 

 by their singular MoUuscan inhabitants, thus serve in some meas- 

 m'e to enliven the solitudes of the ocean. 



Ocnus DENDRONOTUS, Alder and Hancock. 1845. 



Tentacles cluljbed, lamellar, with branched sheaths ; hood of the 

 head furnished with branched ajjpendages. Branchia) ramose, in a 

 single range along each side of the back. 



Dendronotus arborescens. 



Plate XXII. Figs. 311, 312, 313. 



Animal large, surface somewhat warty, pale reddish, marl)led with brown, 

 cream-color and opaque white, occasionally white; front with six branching 

 fringes ; branchite six or more pairs, elaborately ramose. 



Doris arborescens, Muller, Zool. Dan. Trodr. 229. — Fabr. Fauna Granl. 346 (1780).— 



Gmelin, i. 3107, No. 25. 

 Doris crvina? Gmelin, i. 3105, No. 12. 

 Tritonia arborescens, Cuvier, Ann. du Mus. vi. 434, pi. 61, figs. 8- 10. — Lamarck, An. 



sans Vert. 2d ed. vii. 454. — Fleming, Brit. An. 284. — Johnst. Ann. Nat. Hist. 



i. 115. — Gould, Invert. 5, 



