Cretaceous Gastropoda, and Pelecypoda from Zululand. 81 
rocks of Palestine (Jerusalem, &c.) in the Buchiceras zone, and it 
sometimes occurs in the Turonian beds of the same country. 
It is interesting to note also that this species has been recognised 
by Dr. Kossmat in the Upper Cretaceous rocks of the Island of 
Semha near Socotra {Denkschr. K. Ahad. Wiss. [Wien], 1902, 
vol. Ixxi., pi. iv., fig. 9, p. 55). 
An example of a valve of this species has been recognised as 
occurring in the form of a natural cavity in the matrix associated 
with a large form of Schlosnhachia, collected by Mr. W. Anderson 
from the same district in Zululand, the Ammonite being referred to 
by Mr. G. C. Crick on p. 240 of his memoir upon this subject in 
Anderson's ''Third and Final Eeport." The condition of the 
Ammonite, however, was too imperfect for determination, hence 
it proved of no value for accurate geological horizoning, although 
the occurrence of Schloenhachia is much in favour of a Cenomanian 
or Albian age. 
Locality. — Tributaries of the Manuan Creek. 
Genus GONIOMYA, Agassiz, 1842. 
Etudes Critiques sur les Mollusques Fossiles, Monographie des 
Myes, 1842, p. 1. 
GONIOMYA, sp. 1. 
Plate VI., figs. 18, 19. 
Observations. — The specimen here referred to is a good frag- 
mentary natural- cast of a somewhat wide form of Goniomya which 
exhibits the anterior and part of the posterior regions of a specimen 
having united and closed valves. The posterior side of the right 
umbo is not preserved, otherwise the umbones, judging from the left 
valve, may be regarded as depressed, incurved, and contiguous, 
besides being laterally and obtusely carinated ; from the front of the 
umbones a gradually widening gape takes place which extends to 
the ventral area. A small piece of original shell reposes in the 
trough-like cavity just behind the umbones, and further fragments 
are seen elsewhere on the surface, but none retain the granulate 
ornamentation usually associated with this genus. 
As in most forms of Goniomya, the valves show compression, 
their greatest convexity being in the centre of the anterior region. 
The front margin of the shell slopes considerably from the umbones, 
and afterwards becomes rounded to meet the curvature of the ven- 
tral corner ; the ventral borders appear to be crushed and somewhat 
incomplete. The characteristic V-shaped ribs of this genus can be 
traced to almost the ventral margins, being arranged with great 
6 
