114 TETHYS—PHYCOPHILA. 
“ Aplysia lessoni L. emend Gm.” of Mazzarelliand Zuccardi, Boll. 
Soc. Nat. Napoli iii, 1889, p. 51, from coral reef at Honolulu, 
Hawaiian Is., can scarcely be the A. lessoni of Rang (see p. 86). 
Can the specimen possibly have exchanged locality labels with A. 
chierchiana, also collected by Chierchia, and described in the same 
paper? 
Subgenus Paycopuita A. Adams, 1861. 
Phycophila Av., Annals and Magazine of Natural History (8), 
viii, p. 141 (August, 1861).—Placobranchus M. E. Gray, Figs. 
Moll. Anim., iv, p. 35, 1850.—Aclesta (Pacobranchus) Gray, t. ¢., 
p. 98. 
Body compressed, elongated ; sole of foot narrow; shell elon- 
gated, oblong, thin, flat, membranous, the apex not involute. (Ad.). 
Type A. euchlora. 
This group, as far as known, is mainly distinguished by its very 
much elongated tail, and the narrow sole adapted to creeping on 
floating weed away from the shore. Its true affinities and status 
cannot be determined from the meagre data now extant. Were it 
not for the membranous shell mentioned by Adams I would refer 
this group to Stylocheilus. 
T. EucHLORA A. Adams. PI. 61, fig. 54. 
Green, smooth, compressed; sole narrow; forward tentacles 
elongated, backward tentacles narrow, truncate at their apices ; tail 
produced. Shell membranous, oblong, dilated in front, the apex 
not involute. (Ad.). 
Strait of Tsugaru (Tsugar or Tseuka), Japan, crawling on floating 
Zostera (Ad.). 
Aplysia (Phycophila) euchlora A. Av., Ann. Mag. Nat. Hist. (8), 
viii, August, 1861, p. 141.—Placobranchus euchlorus in M. E. 
Gray’s Figures of Molluscous Animals, iv, p. 35 (name only) ; ij, 
pl. 179, f. 1, right hand fig. (1850). 
Mrs. Gray’s figure was etched from a drawing by Arthur Adams. 
She gives the locality ‘“‘ Borneo.” “ It is oceanic in its habits, or at 
least found at some distance from the shore.” 
T. apaAmsi Pilsbry, n.n. PI. 61, fig. 55. 
No description of this species has been published. It is known 
by a figure drawn from life by Arthur Adams. The very long tail, 
