294 PROCEEDINGS OF THE MALACOLOGICAl SOCIETY. 



smootli, and of equal size. Colour pink, but mostly yellowish with 

 concentric pink bands on the head valve, longitudinal, usually three 

 on each side, on the intermediate valves, and mostly absent on the 

 tail valve ; these bands are slightly undulating or zigzagging. 



Interior bright pink, sinus broad and smooth, sutural laminae 

 broadly rounded. Anterior valve with 1 1 slits at irregular distances, 

 intermediate valves with 1 slit on each side, posterior valve with 

 8 slits ; corresponding with the slits there are radiate fine white 

 lines in all valves. Length 5, breadth 3 mm. ; divergence 80°. 



Hah. — A few specimens and a number of valves in sand dredged 

 in 50 fathoms near the Bounty Islands by Capt. J. Bollons. 



To judge from the valves gathered, the species will attain a slightly 

 larger size, but most of my specimens are considerably smaller. 



The smallness, colour, and absence of radiating sculpture distinguish 

 this species from the other New Zealand forms of the genus. Type 

 in my collection. 



CALLOCHiToisr iLLUMiNATus (Rceve). 

 A young specimen, only 5 mm. long, kindly given me by Capt. J. 

 Bollons, was found amongst dredgings in 50 fathoms near the 

 Snares Islands. The specimen is semi-transparent, dirty-white, has 

 the characteristic girdle-scales of the genus, and the sculpture of the 

 species ; there are only five elevated threads on each side of the 

 central areas. The first known occurrence of this species in New 

 Zealand waters was recorded by the writer in 1897.^ 



Callochiton suLCur-ATus, n.sp. 



Shell very small, oval, angularly raised, side-slopes straight, central 

 areas laterally grooved, colour light fulvous. Anterior valve smooth, 

 with a few tine growth-lines, the whole surface dotted with small 

 black eyes. Intermediate valves having the jugum sharply rounded, 

 central areas microscopically longitudinally closely striate, on each 

 side 4 to 5 deep grooves, twice as broad as the ribs, the innermost 

 groove extending only over half the length ; lateral areas distinctly 

 raised, microscopically radially striate, with numerous eyes, flatly 

 and broadly nodulous by a few concentric furrows, more pronounced 

 near the margins ; sutures crenate. Posterior valve smooth, with 

 many eye-dots ; mucro in front of the middle, low ; posterior slope 

 slightly concave. Girdle with elongated, poiuted, and slightly keeled 

 smooth scales. Colour light fulvous, darker on the end-valves and 

 lateral areas ; girdle white, with fulvous patches. Interior pinkish- 

 white ; anterior valve with 14, median valves with 2, and posterior 

 valve with 1 slits ; teeth blunt, propped up on the outside ; eaves 

 spongy ; the low and broadly rounded sutural laminae continuous across 

 the shallow sinus. 



The approximate dimensions are : length 9, width 6 mm. ; 

 divergence 105°. 



Proc. Malac. Soc, vol. ii, p. \l 



