128 
THE NAUTILUS. 
it is Tasmanian. Numerous specimens received from Mr. H. 
Suter, collected by Mr. W. L. May, at Frederick Henry Bay, Tas¬ 
mania, show a considerable range in pattern of coloring. The in¬ 
terior is very much like that of Lottia gigantea, and the anterior, 
marginal position of the apex also forcibly recalls that West Ameri¬ 
can species. 
Acmaea parva Angas, var. tasmanica n. v. 
Shell smaller, wider and higher than “ Nacella ” parva Ang. (P. Z. 
S., 1878, pi. 54, f. 12), opaque white, with radial irregular rays of 
bluish or subtranslucent white at the sides and short, transverse bars 
of the same on the back. Length 8, breadth 2'2, alt. To mm. 
Estuary of Derwent R., Tasmania, 10 fms. Collected by Mr. W. L. 
May. 
Ischnochiton (Haploplax) Mayi n. sp. 
Shell short-oval, moderately elevated, carinated, the side-slopes 
slightly convex. Surface smooth to the naked eye, but finely gran¬ 
ular. Color of valves and girdle uniform black above, or slightly 
brownish at the beaks when eroded. 
The intermediate valves have almost straight sutures, even a trifle 
concave in old specimens, the beaks projecting a trifle in young 
ones. Lateral areas distinctly raised (the diagonal distinct and rather 
wide), sculptured with several arcuate, indistinct growth-marks, 
sometimes showing very slight traces of coarse, low pustules, but 
these are hardly mentionable; all over minutely granulose in dia¬ 
mond pattern. Central areas with faint growth-strife anteriorly, 
distinctly granulose at the sides, the granules arranged to form for¬ 
ward-converging riblets, which, though slight, are apparent on the 
outer half of each valve; central portion of central areas smoothish, 
with faint granulation only, beaks smooth. End valves sculptured 
like lateral areas. Valve viii with mucro projecting, at about the 
anterior third ; the posterior slope concave below the mucro and 
then straight. 
Interior dull blue-green, greener behind the rather heavy valve- 
callus, the depth of the cavity rather lead-color. Sutural lamime 
small, projecting less than half the length of a valve; sinus wide. 
Slits in valve i, 11 ; valves ii to vii, 1-1 ; valve viii, 12-13. Teeth 
sharp, smooth and short. 
Girdle black, clothed with densely imbricating, coarse, convex, 
smooth scales. 
