68 Gidlif arid Gahrlel: 



Dimensions. — Length. 1.5; breadth. .5 mm. 



Locality. — Jan Juc, Puebla coast (type), in shell sand; also- 

 dredged in 8 to 10 fathoms Western Port. 



06s. — Another specimen is of ^■eddish-bro^vn colour, with the 

 excei^tion of the base and peristome, which gradually become pale- 

 yellow. 



Type in .Mr. J. H. (latliff's collection. 



Rissoa verconis, Tate : v.u-. apicilata, var. nov. 

 (Plate VIIL, Fi<,'. :3). 



The species was originally named by Petterd Rissoa baclia,^ and 

 the following is his description : — " Shell small, narrowly oblong, 

 smooth; whorls 6, aperture small, labrum thick; apical whorls 

 inflated. Long., 1.75; lat., .50 mm." 



The name being pre-occupied by A. Adams in 1861, was changed 

 by Tate to R. verconis,^ and the shell was figured by Tate and 

 May. 3 It has a rounded dome-shaped apex. 



In the variety' the apical whorl is oblique, and of a somewhat 

 peculiar formation, the nucleus is not situated at the highest point,, 

 but drops down to the left. Colour, brown. 



Dimensions. — Length, 2; breadth, .53mm. 



Locality. — Type of variety, dredged in 6 to 8 fathoms Western; 

 Port; Port Albert (T. Worcester). 



Rissoa wilsonensis, sp nov. (Plate VIII, Fig. 4). 



Shell minute, tun-eted, white, shining, semi-transparent. Whorls 

 four, including a prominent dome-shaped protoconch. Whorls fur- 

 nislied with four elevated, rounded, spiral keels, the interstices 

 being about twice the width. The body-whorl, with its eight carinae 

 occupying slightly more tlian lialf the length of shell. Sutures 

 deeply impressed. A microscopie- examination of the interstices 

 discloses a minute sciilpture of numerous, slightly undulating spiral 

 thi'eads, ciossed l)v threads of feebler strength. The protoconch is 

 well defined, and ornamented with spiial lirae. Aperture, througl> 

 which the spiral sculpture may l)e seen, ovate; labrum thin; inner 

 li]) slightly patulous. 



Dimensions of Type. — Length, 1.5; breadth, .75 nmi. 



Locality. — Dredged off Wilson's Promontory. 



1 Jour, of Conch., 1884, vol. iv., p. IHS. 



•2 Trans. Roy. Sec. S. Aust.., 1S!M», vol. xxiii., p. •_';«. 



"^ Pioc. Linn. Soc. N.S.W., 11)01, vol. xxvi., p. a02, pi. 27, fijf. 80. 



