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AMERICAN JOURNAL 



white and very light purple dots ; under portion of the body, 

 edges of the mantle and labial tentacles margined with dark slate 

 color. 



Sab. — Huaheine. 



Remarks. — When in confinement it adhered with considerable 

 tenacity to the jar by the hinder portion of the foot. 



Pleurobranchus grandis, Pease. — Plate 10, fig. 2. 



Description. — Testa nulla. 



Animal oblong-oval, subpellucid, flaccid, depressly convex, 

 covered with a network of impressed lines, the interspaces finely 

 tuberculated. Mantle covering the head, deeply notched in 

 front. Head small and narrow; oral veil moderately developed, 

 subtriangular, sides biplicate. Tentacles smooth, stout, trun- 

 cate, involute. Eyes very minute, scarcely visible without the 

 aid of a lens, deeply immersed at the base of the tentacles. 

 Foot large, thin, elongate oblong, convexly truncate and dupli- 

 cate in front, rounded behind, when creeping projects far behind 

 the mantle, generally much exposed from above, as well as the 

 gill. Gill very large, the two rows of plumules folded against 

 each other, each one consisting of twenty-six tripinnate plumules, 

 disposed alternately, and tuberculated at their bases. The gill 

 is attached two-thirds of its length by a lax thin membrane. 

 Anal duct at the posterior end of the membrane, it is cylindrical, 

 truncate and deeply crenulate at the tip. Generative organs 

 very large, immediately anterior to the gill, connected by a 

 prominent grooved ridge. "Whole upper surfaces of the mantle 

 covered with a reticulation of pale bluish ash lines, interspaces 

 fawn color, becoming obsolete toward the margin and more or 

 less dotted with whitish. Also ornamented with a large oblong 

 dorsal spot of deep purple brown, and a series of irregular shaped 

 spots surrounding it, of same color, all of which are dotted with 

 pale-blue. Head pale, mottled with purple brown. Tentacles 

 pale at their tips and lineated transversely with darker. The 

 inner portion of the under side of the mantle and upper side of 

 the foot deep purple-brown. Locomotive disk bluish ash, tinged 

 anteriorly with cream-yellow, and marked posteriorly with a 

 purple-brown stripe. Veil same color as foot. Gill deep purple- 

 brown, generative organs purple-black. 



Dimensions. — Length six inches. 



Hah. — Huaheine. 



Remarks. — This large and delicate species differs from others 

 of the genus, in the mantle being extended over the head and 

 notched for the accommodation of the tentacles; also in the at- 



