276 
INFERIOR OOLITE AMMONITES. 
species " sdssus,'' I retain the n-dme Hull andge" only for the present form, 
which differs essentially from " sclssus " in the points mentioned above, although 
there is sufficient evidence to show that practically all the links connecting this 
form and " scissus " are now figured. The specimen is unique. It came from the 
Mnrchisoiise-zone at the quarry on the Marston road, about two miles from 
Sherborne in Dorset. 
PoLYMORPHiD^ (continued). 
Oenus — Catullockras, Gemmellaro. 
{Type — Catflioceeas Dtjmoetieri, Thiollibre sp.) 
1886. Catullocebas, Oemmellaro. ISul Dogger- iuferiore di Moute San Griuliano 
(Erice) ; Gioruale di Scienza naturali ed 
econoiniche di Palermo, vol. xvii, p. 203 
(only abstract of paper). 
1887. Geuppe dee Dum. Dumoetieei (Catullocebas, Geynm.), Haug. ' Poij- 
morphidae ; ' Neues Jahrbuch fiir Mineral., &e., Bd. ii. 
p. 143. 
Discoidal, carinate, whorls ornamented with direct, ventrally-inclined ribs. 
Ventral area carinate, and the carina sometimes bordered by furrows. Suture- 
line with superior lateral lobe rather longer than the siphonal, and with the 
inferior lateral and auxiliary lobes dependent. 
The genus Gatulloceras^ was created by Gemmellaro, and Gatnll. Dumortieri 
was selected as the type-species. I have only seen an abstract of this paper, and 
I do not know whether Gemmellaro has since published any definition of his genus, 
or of the other species which he states belong here. 
GatuUoceras practically differs from Pol. Vernosae or from Ziiteli only in the 
addition of a carina. It is doubtless descended from Pol. Zitteli, as it shows the 
same periodic constrictions ; but the ventral band which Yacek mentions (p. 26(> 
above) probably points to there being a link missing m the development — a 
species which was probably ancestor of both Gatnlloceras and Tmefoceras. 
Whether this theoretical ancestor split, also, into two branches in developing 
GatuUoceras — the one branch acquiring a carina in the middle of the ventral 
1 Catullo, the celebrated Italian geologist; Kepas, a born. Hybrid names of this kind were 
strongly condemned by the British Association Committee of JS'atuialists ('Eeports,' vol. xi, 
p. 120, 1812). If the word " Cafullia" be not in use geuerically, it vrould certainly be a preferable 
substitute. 
