H> RECORDS OF THE AUSTRALIAN MUSEUM. 



slightly inflected forwards, broadening as the shell grew ; on the 

 flanks some of the costae are directly transverse, others faintly 

 sigmoidal. 



T have repeatedly hesitated to unite these shells (typified by 

 PI. xxxi.) with C. jackii proper (typified by PI xxxii., fig. I; 

 PI. xxxiii., hg. 1; PI. xxxv., fig. 1), but their respective forms, 

 mode of inrolment and costal characters are so similar, I ulti- 

 mately felt unjustified in separating them in the present state of 

 ii iv knowledge. It may ultimately be necessary to do so, if it 

 can be shown by dismembering the whorls, or obtaining portions 

 in such a condition, that even one row of the characteristic C. 

 jackii tubercles is not present, although some specimens un- 

 doubtedly possess the swollen costs; of C. jackii. 



Locs. — Walsh River, a tributary of the Mitchell River, Cape 

 York Peninsula [G.S.Q.; Q.M.]. Saltern Creek, north of Bar- 

 caldine, Central Queensland [Q.M.] Roma, South-east Queens- 

 land [Q.M.]. Hughenden, North-Central Queensland [Q.M.; G.S.]. 

 Tate River, a branch of the Lynd River, Cape York Peninsula 

 [G.S.Q.]. Barcoo, Ward and Nives Rivers District, South- 

 Central Queensland [A.M. (H. W. Blomfieldj]. West-south-west 

 of Mount Mulligan, near Walsh Telegraph Station, Cape York 

 Peninsula [G.S.Q.]. 



Crioceras nautiloides, sp. nov. 

 (Plate xlv., and Fig. 8.) 



Sp. Chars. — Shell of medium size, robust. Whorls, only two 

 known, close coiled, very rapidly enlarging and greatly over- 

 hanging one another; initial whorl unknown; venter very broad 

 and convex; abdominal margins very obtuse; dorsum broad, 

 flattened, impressed, coscate ; impressed zone broad ; flanks very 

 convex; umbilical cavity wide and deep ; section transversely- 

 broad-oval. Sculpture varies at different stages of growth ; in 

 the first whorl known the costse are both simple and fasciculate, 

 from one to three of the former separating two or three of the 

 latter; on the succeeding large whorl all are simple, straight on 

 the venter, gently bent forwards on the dorsum, and faintly 

 .sigmoidal on the flanks ; tubercles are confined to the first whorl 

 preserved, one row on each side the middle line of the venter, 

 latero-ventral in position, uniting the costse in fasciculi of two or 

 three. 



Obs. — The specimen }delding the above characters is imperfect, 

 lacking the inner whorls except one, and also deficient at the 

 distal end. Although only a cast and possibly at one time semi- 



