96 TETHYS-POLYNESIAN. 



A large, handsome species, with ample swimming lobes, large 

 mantle provided with a conspicuous central tube and an uncommonly 

 long excurrent siphon. Angas reports it from Port Jackson, but 

 the identity of his specimens with the type collected at Tahiti by 

 Lesson, is open to grave doubt. See under T. angasi Sowb. 



T. PULMONICA Gould. PI. 18, fig. 28. 



Length six inches ; height two inches. Body oblong, posteriorly 

 sacciform, with a short, distinct prolongation of the foot backwards. 

 Color bronze-green, coarsely reticulate with dark veins ; siphonal 

 aperture small ; head obtuse, slightly bilobate ; anterior tentacles 

 short, ear-shaped ; cervical tentacles acutely conical, faintly annulate. 

 (Old.). 



This animal bears a general resemblance to A. tongana of Quoy 

 and Gaimard ; but their figure shows the ruffled posterior disk 

 peculiar to the subgenus Dolabella, no traces of which are apparent 

 in this species. (Gld.\ 



Tutuilla, Samoa Islands^ 



Aplysia pulmonica GOULD, U. S. Exploring Exped., p. 223, fig. 

 268 (1852). 



The more essential structural characters of this species are un- 

 fortunately unknown. Compare T. tryoniana and T. keraudrenii. 



Var. TRYONIANA Pilsbry, n. v. PI. 57, figs. 54, 55, 56, 57. 



Length (of an alcoholic specimen) about 13 cm. Body of ample 

 width. Buccal lobes and tentacles as usual, the later stout-conic, 

 near together. Swimming lobes arising at about the anterior third, 

 long, very ample, united behind at their junction with foot; ante- 

 rior insertions widely separated. Mantle large, with a minute sub- 

 median pore on a very low, hardly noticeable papilla, surrounded 

 with short black wrinkle-rays, star-like. Free right border of 

 mantle wide, abruptly narrowed toward the posterior end, excised, 

 and terminating in a fold forming a well defined excurrent siphon. 



Genital orfice and groove as usual, the latter deep with overlap- 

 ping left margin. Orifice of opaline gland a large pit about 11 mill, 

 behind genital pore. 



Color (of alcoholic specimen) externally a dirty light olive, much 

 and irregularly clouded and mottled with black on the anterior half, 

 less so posteriorly ; with a crinkly-reticulation of black throughout. 



