40 Transactions of the Boyal Society of South Africa. 
tion and consequently not nearly so wide across the front end region 
of the valves. 
The species is named in honour of Mr. Geo. C. Crick, of the 
British Museum, and author of a monograph on Cretaceous Cepha- 
lopoda from Zululand, published in Mr. Anderson's "Third and 
Final Eeport." 
Locality. — Tributaries of the Manuan Creek. 
Teigonia blanckenhorni, sp. nov. 
Plate v., figs. 1-4. 
Descrii^tion. — Shell (right valve) obliquely oviform, thick, elongate, 
shallow ; umbo depressed, incurved ; surface unequally divided 
externally by a rounded carination extending obliquely from the 
umbo to the postero-ventral margin, anterior or pallial section, the 
largest being about double the width of the posterior and furnished 
with from 16 to 18 oblique, smooth, rounded, equally disposed, well- 
elevated costse, which proceed from the carina to within a short 
distance of the outer margin, where they curve upwards by tapering 
terminations and become merged in the growth lamellae of the shell, 
correspondingly deep and smooth sulcations separating the costae ; 
anterior margin abrupt, deep, smooth, lamelliform, antero-ventral 
and ventral borders curved ; posterior region elongate, depressed, 
oblique, obscurely furrowed medianly and longitudinally, bearing a 
narrow, steep, elongate escutcheon area which is bordered by a 
secondary carina and outwardly by a thickened margin parallel with 
it ; surface ornamentation consists of coarse oblique growth-lines 
with an upward curvature ; interior exhibiting two strong, divergent, 
transversely striated teeth, the anterior being thick, short, and feebly 
curved outwards, the posterior unusually elongate and narrow, deep 
adductor and pedal scar impressions, and a pallial line remotely 
distant from the ventral border. 
Dimensions (a right valve). — 
Length 60 mm. 
Height 55 ,, 
Diameter 18 ,, 
Observations. — This Trigonia is represented by three right valves, 
which, although fragmentary, possess some interesting features 
which appear to separate it from other forms of the genus. It is 
of unusually smooth sculpture, there being no evidence of any kind 
of radial striations ; the pallial costae and sulcations are clearly and 
regularly developed, and show only a very slight curvature in their 
progress to the anterior border ; the smooth posterior region is also 
