1 4J RECORDS OP THE AUSTRALIAN MUSEUM. 



sculpture varies at different stages of growth, aud I am mainly 

 dependant, although not in every instance, on incomplete 

 material. 



Jt' the tuberculatum be made use of as a guide, to some extent 

 following Hyatt's lead, we find the Australian species can be 



arranged as follows : — 



1. Without tubercles of any kind. C. taylori, mihi. 



2. Tubercles only in the youngest condition, one row on each side 



the middle line of the venter. C. itautiloides, mihi. 



3. The same as No. 2, with three rows of tubercles. 



C. jackii, mihi. 



4. With one row of tubercles on each side the middle line of the 



venter throughout life (i.e., as far as known) — C. axonoides, 

 mihi ; C. jUndersi, McCoy; and C. plectoides, mihi. 



5. With two rows in a similar position throughout life. 



C. laf/iieitx, mihi; C. cordycepoides, mihi. 



6. With three rows in aged individuals (young stage unknown). 



C. lampros, mihi. 



According to Hyatt's classification, only one of these groups 

 (No. 5) can be strictly regarded as a member of the Crioceratidse, 

 and one referable to his Ancyloceratidre (No. G). 



The diminutive forms of the Point Charles and Shoal Bay beds 

 are too fragmentary, in most cases, for an opinion to be formed 

 of their more perfect condition. Not long since I endeavoured 20 

 to provisionally refer these to genera, but without marked success. 



It is almost superfluous to mention that our Australian species, 

 with one possible exception, are not typical Crioceri of the 

 C. duvali group. The latter throughout their volutions are more 

 or less pipe-like, and increase but little in diameter. On the 

 contrary, the former do, and are much more ammonoid, and even 

 to some extent nautiloid, in appearance. In this respect if one 

 conceives Pictetia asterianum, D'Orb., 21 to hs closer coiled than 

 it is, the resemblance to our C. jackii in the gerontic stage is 

 very marked. This ammonoid-like appearance was remarked on 

 by Neumayer and Uhlig in C. Jissicoatatum, Koemer. -- 



In some dwarfed European species Uhlig discovered 23 that the 

 first, or first and a half, volutions succeeding the embryonal are 



2°Etheridge— S. Austr. Pari. Papers, 1907 (Suppl. to No. 55, 1900). 

 pp. 15-18, pis. ix.oci. 



"D'Orbigny— Pal. Fran^ Tern Oct., Ceph. i., 33-42, 1S42, pi. cxv. bis, 

 figs. 3 ami 4. 



aa Neumayr & Uhlig — Palaeontographica, xxvii., 3, 1SS1, p. 1S2, pi. hi., 

 f. 1. 



23 Uhlig— Denk. K. Akad. Wiss. Wien, xlvi., 2, p. 260. 



