LOWER CRETACEOUS FOSSILS — ETHERIDGE. 1 G3 



Portions of small Crioceri(l) iif with simple, non-tuberculate 

 costae occur plentifully in the Port Charles and Shoal Bay beds 

 of the Northern Territory, but the costae are relatively coarser 

 for the size of the specimens than those of C. taylori. 



Locs. — Aramac Well, Aramac, Thomson River, Central Queens- 

 land [G.S.Q.]. Head of Walsh River, a tributary of the Mitchell 

 River, Cape York, Queensland [Q.M.] Barcoo, Ward and Nive 

 Rivers District [A.M. (//. W. Blomfield)\. (?)Central Australia 



[as.]. 



Criockras (?), sp. 

 (Plate xxxv., fig. 2; PI. xlii., fig. 1; PI. xlvi., fig. 2; PI. xlvii. fig. 5.) 



Sp. Chars. — Shaft and crozier large, the extension of the former 

 into the latter forming a broad curve, uncompressed. Shaft 

 straight; venter narrow ; ahdominal lines defined by tubercles ; 

 dorsum broad and almost fiat ; impressed zone obliterated ; flanks 

 biangular, but on the whole rounded ; section around the 

 primary costae unsymmetrically hexagonal, around the valleys 

 broad-oval, or almost round. Costae primary and secondary, the 

 former single, strong, and often separated by shallow valleys of 

 varying width, but usually wide; primary costae of the shaft and 

 crozier venters straight and trenchant between the two rows of 

 tubercles marking the abdominal lines ; on the shaft dorsum 

 inclined slightly forwards ; on shaft flanks oblique or faintly 

 sigmoidal, and biangular, the angles separated by a line <>f dorso- 

 lateral tubercles on each flank; costae in the crozier bend straight; 

 secondary costae straight and flat, filling the valleys ; test with 

 delicate encircling lines. Tubercles arranged in two rows on each 

 side the median line of the venter on the primary costae on])-, two 

 rows abdominal and two rows dorso-lateral, all conical, acute and 

 prominent. 



Obs. — I have here united three specimens, believing them to 

 be the same, although differing in a few minor details ; the coiled 

 portions are at present unknown to me. 



The first of the three specimens is a large shaft with very pro- 

 minent, outstanding, and irregularly distant primary costae ; it 

 is on the dorsum of this example that the secondary costae and 

 test are visible. It is a remarkable specimen, and in some of its 

 aspects resembles the coil C. lamproa, such as the angularity of 

 the primary costae, here hexagonal instead of octagonal as in the 

 species named ; the straight or horizontal nature of the trenchant 

 primary costae on the venter is another point of resemblance. 



48 Etheridge— Mem. Roy. Soe. S. Austr., ii., 1, 1902, p. 46, pi. v i i . . figs. 

 12, 13; S. Austr. Pari. Papeis, 1907 (Suppl. to No. 55, 1906), p. 16, pi. ix. r 

 figs. 11-15. 



