148 NOTAKCHUS. 



and Proc. Viet. Inst. Trin., 1895, p. 123. Not of Riippell and 

 Leuckart. 



A single specimen found among rocks terminating the beach in 

 front of the lagoon of Peteninga, one of those brackish lakes com- 

 mon along the coast separated from the sea by a strip of sand, per- 

 haps fifty yards wide, and six feet above high tide. Resembles A. 

 savigniana Fer., but is distinguished by its broader foot and the fil- 

 amentous prolongation of the lips, as well as in many of its details. 

 It belongs to the genus Notarchus of Cuvier. (GldJ). 



N. PLEII Rang. PL 43, fig. 31 ; pi. 44, figs. 35, 36, 37 ; pi. 62, figs. 



1, 2, 4 (anatomy). 



Description of alcoholic specimens: Length about 11-13 cm. 

 Long ovate, plump, very soft and flabby. Tentacles flattened, slit 

 in front, bearing long filaments. Rhinophores rather short and 

 with a few filaments. Entire dorsal surface having scattered min- 

 ute simple filaments, and a number of larger, flattened processes, 

 ragged with filaments. Sole broad, acute behind, roundly truncate 

 in front, with a second free border behind the anterior margin. 

 Mouth longitudinal with radially wrinkled lips ; lateral labial pro- 

 cesses large, broad and flat. Color light olive. 



Antilles (Plee) ; St. Crolx and St. Thomas (Riise, Krebs, Ravn) ; 

 Little Gasparilla Bay, W. Florida ( Willcox & Heilprin), on floating 

 masses of sea-weed. 



Aplysia pleii RANG, Hist. Nat. Aplys., p. 70, pi. 21 (1828). 

 Notarehus pleii MORCH, Journ. de Conch., xi, 1863, p. 25 ; Malak. 

 BL, xxii, p. 176. D'ORBIGNY, Moll. Cuba, i, p. 118. ARANGO, 

 Fauna Mai. Cubana, p. 156. 



N. pleii is nearly allied to N. lacinulatus, but the latter is smaller, 

 with more acuminate labial processes, according to the figures. 



There is great variation in the degree of development of the ap- 

 pendages of the integument, some specimens having them less conspic- 

 uous than in Rang's figure (copied on pi. 43, fig. 31), while in others, 

 such as the specimen from west Florida drawn in figs. 35, 36, of pi. 

 44, the appendages are longer. Rang's figure seems misleading in 

 the drawing of the labial processes, according to my specimens, and 

 he does not show the doubling of the anterior foot margin, conspic- 

 uous in all of the numerous examples I have seen. 



PI. 43, fig. 31 and pi. 44, fig. 37, are copied from Rang. I have 

 drawn on pi. 44, fig. 35 (dorsal view) and fig. 36 (under side of 



