PARAPLYSIA. 115 



variegated and ocellated color-pattern and short swimming lobes, 

 indicate a distinct species, however. 



Borneo. 



Placobranchus ocellatus (Van Hasselt), M. E. GRAY, Figs. Moll. 

 Anim., 1850, iv, p. 35 ; ii, pi. 179, left hand figure (from Adams' 

 drawing). Aplysia ocellata A. AD., Ann. Mag. N. H. (3), viii, p. 

 141 (August, 1861) ; name only. Not Aplysia ocellata d'Orbigny. 



Genus II. PARAPLYSIA Pilsbry, 1895. 



Paraplysia PiLS.,Man. Conch. XV, pt. 62, p. 64 (Nov. 26, 1895). 



General form oval ; buccal tentacles rather large, widely separated 

 and pointed ; rhinophores small, conic, close together, situated be- 

 tween the anterior ends of pleuropodial lobes. Pleuropodia arising 

 at the anterior third of the animal's length, well separated at their 

 origin and throughout, uniting only at their union with the foot very 

 near its posterior extremity. Mantle large, posterior, exposed, with 

 a posterior excurrent siphon, and apparently covering the gill ; the 

 genital pore slightly in front of its anterior edge, not covered. 



Shell about a third the length of body, concave, subquadrate. 



This very well characterized genus is known by Dr. Gilchrist's 

 paper cited and quoted below. Unfortunately the presence and 

 nature of the mantle foramen and the opaline gland are not stated ; 

 the dentition is unknown, and the shell has not been figured. The 

 latter apparently resembles that of Tethys. 



The remarkable features of this type are : the position unique in 

 the Anaspidea of the rhinophores between the anterior ends of 

 pleuropodial lobes, the latter being completely free ; the posterior 

 situation of the mantle, and the short, oval form of the body. The 

 posterior end of foot is free from the visceral mass, which overhangs 

 it. 



P. PIPERATA Smith. PI. 21, fig. 12. 



Animal (in spirit) olivaceous, minutely and closely dotted every- 

 where, with the exception of the foot, with black ; hinder third part 

 of the body somewhat paler than the rest, from which it is marked 

 off by a blackish band passing right round the animal. Lobes of 

 the mantle narrowish in front where they arise quite close to the 

 posterior tentacles, considerably dilated behind. Oral tentacles 

 large, long, and pointed ; posterior small, close together, conical. 



