97 
Locality and Horizon . — Jamheroo, Co, Camden ( C. Cullen and B. G. 
JEngelhdrdt) ; Railway Cutting at Wollongong, Co. Camden (C. Cullen) ; 
Northern hank of the Minumnrra River, near Jamheroo, Co, Camden 
(B. G. IjngelJiardt) : — Upper Marine Series. 
TllIBRACniOCRINUS GllANULATUS, sp. nOV. f 
PI. XXII, Pigs. 2 and 3. 
Sp. Char . — Calyx depressed, and generally saucer-shaped, practically 
symmetrical ; infra-hasal cup flattened around its periphery, and concave 
inwards from just within, the infra-hasi-hasal sutures, producing a wider 
and more open concavity than that in T. corrugatus. Suture between the 
heptagonal and hexagonal posterior hasals shorter than that in T. corrugatus, 
with the result that the plates named and the azygous plate are transversely 
wider in comparison to the lieiglit of the more depressed calyx. Anal plate 
apparently pentagonal ; second anal deltoid, and very prominent. Columnar 
facet large in comparison to that of T. corrugatus. Sculpture, on the cast of 
concentric lines parallel to the outlines of the plates, on the test of a minute 
compact granulation. 
Ohs . — This provisional species undeniahly comes very near to Trihra- 
chiocrinus corrugatus, hut it appears to differ from it in three very marked 
features. In the first place, the calyx is much depressed in comparison wutli 
that of T. corrugatus, the only species with which it need he compared. The 
hasal cup is much flatter and more depressed, and, above all, the brevity 
of the suture between the heptagonal and hexagonal basal plates is most 
marked. In addition to these, there is the external sculpture. In PI. XXII, 
Rig. 3, is represented the internal cast of the calyx, with the concentric lines 
edging the various plates. Rig. 2 portrays the matrix and external mould 
of a part of this cast, on which the close, fine, granulation of the test is 
faintly preserved. Such an ornament can hardly he mistaken for the 
vermiculate-tuhercular sculj)ture of T. corrugatus. If the external ornament 
in the latter species does not vary in a diminutive sense, and I have not any 
evidence of such a fact before me, hut rather the opposite, the species must 
he separate. We owe a knowledge of this interesting fossil to the researches 
of Mr. B. G. Engelhardt, of the Public School, Jamheroo. 
Locality and Horizon. — Banks of the Minuinurra Rivei’, near Jam- 
heroo, Co. Camden (B. G. HngelhaiultJ : — Upper Marine Series. 
