74 Transactions. 
Species not good enough for Description. 
here are several almost equilateral forms belonging to the huttoni group, 
but to none of the named species. The specimens are poorly preserv 
and few in number, so their separation and description have not been 
attempted. Three species, or subspecies, appear to be represented :— 
(1.) A shell of moderate size and considerable inflation, with low beaks 
and about 30 ribs (see Plate 7, fig. 3) :— 
(а.) Loc. 70—Akuaku, Poverty Bay district (figured). 
(b. Between Blairich and Black Birch Creek, Awatere Valley 
omson). 
(с.) Loc. 154 (?)—Callaghan’s Creek, Goldsborough. 
(d.) The shell figured by Zittel as P. laticostatas (1864, pl. xv, 
fig. 13a, 135) from Awatere Valley. 
(е.) Loc. 862— Near head of Waimata River, N.Z. Geo. Surv. 
Pal. Bull. No. 8, p. 10, listed as G. subglobosa. There is 
only a fragment of the beak and hinge, but it is not . 
lobosa 
subg : 
(2.) A very large shell with wide flat shoulders and narrow beaks :— 
а.) Loc. 649— Paparoa Rapids (also Marshall). 
Loc. 246— Cape Rodney, Auckland. | 
(b.) 
(3.) A large inflated shell with low rounded beaks and an almost smooth 
surface :— 
Loc. 866— Maungatokerau, Uawa, Gisborne District. 
The hinge-line is not clearly shown, so the shell may not belong 
to this group. It is listed as G. subglobosa in N.Z. Geol. Surv. Pal. 
Bull. No. 8, p. 7. | 
ПІ. The Ахїлєа Group. 
Glycymeris trelissickensis n. Sp. (Plate 5, fig. 4; Plate 6, fig. 4.) 
Shell of moderate size, very inflated, almost globular; beaks low, with 
a very wide angle; outline у 
tudinally oval in the adult; anal depression obsolete; sculpture, surface 
appearing almost smooth, but there are fine close radial riblets over the 
crenate, ligamental area small, closely striated by 4 or 5 grooves (a paratype 
of advanced age shows a wide area with 12 grooves) ; teeth small, numerous, 
about 6 on each side free of the area ; muscular impressions subequal. 
Height of holotype (right valve), 42 mm. ; length, 45-5 mm. ; thickness, 
6 mm 
mm. 
Holotype in collection of N.Z. Geological Survey. 
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