78 Transactions. 
of G. modesta from Kaawa Creek ; (c) for specimens from 191—Shrimpton’s 
(Suter, 1921, p. 19). 
is shell is also an Azinea, and is here classed as a new species, 
G. shrimptoni. 
Note on Glycymeris concava Marshall var. (Plate 7, figs. 1, 4.) 
Glycymeris concava Marshall, Trans. N.Z. Inst., vol. 49, p. 459, pl. 36, 
fi 1917.) 
As the Wangaloa beds from which this shell comes are probably Upper 
Cretaceous, this species has not been included with the Tertiary ones 
described above. 
Dr. Marshall kindly sent some of the type-material of the species, 
including the holotype. 
The paratype, 65 mm. high, 63 mm. long, here figured, is worthy of 
notice on account of its very strong beaks. It seems to be entitled to 
at l ast subspecific rank, a matter which сап be cleared up when the 
Wangaloan fauna is being revised, 
SUMMARY or SPECIFIC CHARACTERS. 
(These must be considered as only approximate.) 
I. Laticostata group: Equilateral; circular or dorso-ventrally oval; low 
beaks; area steep, closely grooved. 
(a.) lornensis : Small, subtriangular, ribs broad, beaks moderate. 
(b.) traversi : Ribs and interstices of equal width all over the dise. 
(с.) laticostata : Interstices narrower and ribs broader on anterior half. 
(d.) chambersi : Ligamental area very densely striated, ribbing 
fairly regular. 
П. Huttoni group: Flat obsolete ribs, linear interstices, beaks generally 
strong, ligamental grooves widelv spaced. 
(a.) subglobosa : Equilateral, 55 ribs, beaks wide, shoulders high. 
(b.) huttoni : Subquadrate, strong anal depression, 45 ribs, beaks high. 
(c.) robusta : Subquadrate, shoulders rounded, 43 ribs, interstices 
widening towards the margin 
Ф 
22 
slop 
(9.) rapanuiensis : Longitudinally oval, ligamental area small and 
, 30 ribs 
nely crenate, ligamental area steep, very closely grooved. 
: t very wide. 
agha eaks narrow and prominent. 
(d.) iwavpipiensis : Very large, circular, beaks prominent. 
(e.) shrimptoni : Moderate size, circular to slightly oblique, beaks 
narrow and fairly prominent, 
(f.) modesta : Very small, trigonal, beaks noticeably curved backwards. 
ү X 
