708 APPENDIX I. 
Resembles a compressed Goniatite, but has no septa. The part of the aperture either 
side of the included body of the shell is narrow linear, 
Bellerophon strictus, Exped. Foss., Amer. Jour. Sci., ii. Ser., iv. 151. 
82. BeLLEROPHON MIcRomPHALUs (Morris).—Plate 10, figs. 6 a, 6, different views, 
natural size.—Illawarra. 
This species, like the preceding, has the aspect of a Goniatite. It differs from the 
strictus in being proportionally much thicker. 
Bellerophon micromphalus, J. Morris, loc. cit., 288, pl. 18, fig. 7. 
————___—_—_——_—_—_—— MCoy, loe. cit., vol. xx. 308. Locality cited, Muree, N.S. W. 
d. Mollusca Cephalopoda. 
83, Tueca tancrorata (Morris).—Plate 10, fig. 7 a, lower extremity ; 6, upper ex- 
tremity ; c, section; d, specimen restored. 
From Black Head, District of Illawarra. 
The tapering form (resembling a straight horn), and the somewhat triangular shape of 
a transverse section, are correctly stated by Morris. The length is sometimes at least 23 
inches, with the longest diameter at base over half an inch. The aperture, when un- 
broken, is a little flaring, and on the flattened side of the shell the margin is produced a 
little, and has an arcuate outline, which is therefore parallel with the arcuate striz 
below,—showing that these faint uneven striz are strice of growth. The shell is very 
thin ; and like some others of the locality has a dark olive-green fracture and chloritic 
texture. The inner surface is quite smooth, without stric. 
The Thece have been arranged with the Pteropoda, on account of a resemblance in 
form to the shells of some species of that group. The resemblance is quite as great to the 
osselet in some Cephalopoda, if we suppose the blade part wanting ; and from the large size 
and structure of the Thecz, they probably belong to that order. In the Ommastrephes 
of Blainville, the bone has a hollow conical termination, analogous apparently to the shell 
of the Thecee, the latter differing only in being without the thin blade-like elongation 
above. The striz of growth, and the form of the aperture support this conclusion. 
Theca lanceolata, J. Morris, loc. cit., p. 289, pl. 18, fig. 8. 
Genus CONULARIA.—The Conularize have been arranged provisionally by 
d’Archiac and de Verneuil* with the Pteropoda,t and this reference of them has since 
been very generally adopted by Paleontologists. Still there are some reasons for doubt- 
ing its correctness. 
The shells of the Pteropoda are external, and unjointed in character. The long four- 
sided conical Conulariw, on the contrary, are distinctly articulated (or at least admit of 
motion) between the sides. The same species, as it occurs in the rocks, is of various 
shapes, dependent on this jointed structure, and sometimes the sides are pressed quite 
* Mem. Foss. Older Deposits of the Rhenish Provinces, p. 325. 
+ This view has been apparently favoured by finding transitions to the Thece, those holding it, sup- 
posing the latter to be Pteropods. 
