70 Transactions. 
Although this shell has been recorded from many horizons—as high, 
indeed, as Wanganuian—these determinations must be considered extremely 
doubtful. No specimens examined from other than the two localities 
given above can be placed in this species. 
Glycymeris robusta n. sp. (Plate 3, fig. 5; Plate 4, fig. 5.) 
Shell very large, heavy, much inflated, subquadrate; beaks very 
prominent; anterior dorsal margin long, curved, descending gradually ; 
anterior end bluntly angled above; posterior dorsal margin shorter, more 
rapidly descending ; posterior margin with a flattened curve; basal margin 
meeting the posterior in a blunt angle, but curving regularly to meet the 
anterior; anal depression moderate; scu pture consisting of about 43 
ribs, broad on the anterior and middle part of the disc, but narrow on the 
posterior; interstices narrow, but widening slightly towards the margin; 
crenulations of the inner margin obsolete posteriorly;  ligamental area 
long and fairly wide, with four well-spaced ligamental grooves; teeth 
long and strong, horizontal at the extremities of the hinge-line ; anterior 
muscular impression large, triangular; posterior smaller, subquadrate. 
Dimensions of holotype (right valve) : Height, 74 mm. ; length, 75 mm. ; 
thickness, 30 mm. 
TANK Uu TU SE UL Un Cb Ee AE ae oe pee Sa ENTE IUE 
Target Gully (Park, 1916). (Holotype, in collection of N.Z. Geo- 
logieal Survey.) Specimens collected also by Marshall, Benson, 
and Finlay. 
Survey locality collection from Awatere Valley, loc. 126, and was 
accompanied by a label of Suter’s, “ Cucullaea alta.” This 
? 166—Lower Gorge, Pareora. (A poor specimen, flatter than usual; 
listed by Suter in Pal. Bull. No. 8, p. 57, as G. subglobosa.) 
483—McKay’s “ Hutchinson's Quarry greensands," Wharekuri. (A 
fragment.) 
Remarks. The holotype was used by Suter as a paratype for his | 
G. subglobosa from Kakahu. The excellence of its preservation makes one — 
wonder why he did not make it the holotype of his species, instead of the — — : 
matrix-filled specimen that he used. Perhaps he doubted the exact specific 
identity of the Target Gully and the Kakahu shells. D 
Although a large shell, the holotype is not quite full-grown, and so does ; 
j 
| 
: 
| 
i 
| 
теп. E 
- Point Hill, Glenavy. (Otago University collection.) id | 
' 
not present all the characteristics of the old individuals, which are as much 
as 108mm. in height. These are thicker and heavier, the shoulders are 
more rounded, while the area is broad and has encroached on the teeth, 
which are thick and irregular. The flattened posterior margin is extended 
ventrally, making the shell more inequilateral. 
This species is larger and more tumid than G. subglobosa ; the ribs, too, 
- robusta would be very like mature G. sub- 
globosa, but the old shells present quite a different appearance, having more 
rounded shoulders and an inequilateral outline. 
