DOLABRIFERA. 121 



straight below ; left margin gently convex. Outside gently concave 

 along the middle, sculptured with growth-strise, white with some 

 concentric bluish bands. Interior white, but slightly convex, 

 scarcely calloused. Length 7, breadth 3'2 mill. 



Port Jackson, New South Wales, Australia (Dr. J. C. Cox). 

 D. brazieri is described as " straight ", " apex straight," words 

 that in no way apply to the present form. Still, the two examples 

 of this species which I possess are much smaller than D. brazieri, 

 which has a shell nearly 19 mill. long. Further comparisons are 

 necessary to determine fully the relationship existing between the 

 two forms. A notable feature of D. jacksoniensis is the anterior 

 position of the genital opening. 



D. VITR^EA Sowerby. PI. 34, figs. 23, 24. 



Soft parts unknown. Shell small, thin, glassy, pellucid, narrow ; 

 rostrum short, rather wide, apex incurved, thick ; basal margin 

 slightly arched, outer margin a little rounded. (Sowerby~). 



" Narai," Fiji Islands. 



D. vitrcea SOWB., Conch. Icon., xvi, pi. 1, f. 1 (1868). 



The smallest of the known species ; it is thin and glassy. 

 D. TAHITENSIS Pease. PL 34, figs. 6, 7, 8. 



Animal rather slender, elongate, pyriform, deepest and widest 

 posteriorly, rounded behind, margins thin ; back arched and fur- 

 nished with scattered, minute, subretractile, simple and branched fil- 

 aments ; head rounded above, convex in front ; eyes immersed, a 

 little in advance of the dorsal tentacles, the pupil bluish-black and 

 iris bluish-slate ; dorsal tentacles strongly dilated outwards, ear- 

 shaped, obliquely truncate and grooved ; anterior pair of about the 

 same size, rather more dilated. Variegated with different shades of 

 white, green, olive-brown and sometimes blotched with rusty-brown ; 

 foot pale greenish-gray, closely and finely dotted with opaque white 



and olive. (Pse.). 



Tahiti 



Dolabrifera tahitensis PSE., P. Z. S., 1861, p. 245 ; Amer. Journ. 

 Conch., iv, p. 77, pi. 8, f. 5. 



Common under stones in littoral zone. Active in its motions, 

 gliding along by the middle and lateral portions of the foot alter- 

 nately. The species approaches D. olivacea Pse., Sandwich Islands. 

 (Pse.). 



