234 TRITOXIID^. 



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



size, longer oral tentacles, the lower ori- 



FiK- 516. • f. 1 



gni 01 the tentacular processes, and the 

 greater number of branchial laminae. 

 Ova in a tape-like envelope, adhering to 



Ova of A. sulphwea. , . ^ ' '^ 



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 TRITONIID^E. 



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

 Tentacles retractile within sheaths. Crills 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 algte, 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 inhaljitants, thus serve in some meas- 

 ure to enliven the solitudes of the ocean. 



Oenus DElVDROI^rOTUS, Alder and Hancock. 1845. 



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

 head furnished with Ijranched appendages. Branchiee ramose, in a 

 single range along each side of the back. 



Dendronotus arborescens. 



Plate XXIL Figs. 311, 312, 313. 



Animal large, surface somewhat warty, pale reddish, marliled Avith brown, 

 cream-color and opaque Avhite, occasionally Avhite ; front with six brandling 

 fringes ; branchiae six or more pairs, elaborately ramose. 



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



Gmelin, i. 3107, No. 25. 

 Doris c^rvina? Gmelin, i. 310.5, No. 12. 

 Tritonia arliorcsrem, Ccvier, Ann. ihi Mus. vi. 434, pi. 61, figs. 8- 10. — Lamarck, An. 



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



i. 115. — Gould, Livcrt. 5. 



