756 ON CONULAPJA AND HYOLITHES. 



This species is an important one from the fact that it is one of 

 the few Carboniferous forms of its genus. According to Bar- 

 rande,'^ Hyolithes does not occur in the Carboniferous, but jumps 

 from the Devonian, to which he referred the present species, to the 

 Permian. The latter formation contains one species, described 

 by Dr. H. B. Geinitz, but it is needless to observe that there are 

 no orounds for placing H. lanceolatus in the Devonian. Prof. 

 K. Zittel, on the contrary, mentions f one Carboniferous species, 

 which is probably the present form. 



EXPLANATION OF PLATE. 



j'ig. 1. — Gonularia inornata, Dana. Portion of a large specimen with the 

 sides of the shell at the upper or proximal end inwardly bent 

 towards the centre. (Nat. size.) 



Fig. 2. — Hyolithes lanceolatus, Morris, sp. An almost complete shell 

 viewed from the convex face. ( x 2.) 



Fig. 3. — Side view of the same specimen. ( x 2.) 



W\g. 4. — Portion of the external sculpture of the same, highly magnified. 



Fig. 5. — Another example, partially decorticated, with the operculum 

 in situ. ( X 2.) 



Fig. 6.— An isolated operculum seen from above. (x2.) 

 Fig. 7.— External sculpture of the same, highly magnified. 



* Loc cit. p. 73. 

 t Handbuch der Palaeontologie, 1885, 1 Abth. ii. Bd. p. 316. 



