THE INFERIOR OOLITE OF DORSET. 



601 



much the shape &c. of Cosmoceras subfurcatum, and is ornamented 

 with four rows of sharp spines, just where they occur in Cosm. 

 subfurcatum ; but it is entirely destitute of ribs.] 



Locality. Higher part of the Humpliri esianum zone at Oborne. 



The termination is a spathulate ear, slightly wider towards the 

 extremity. 



Morris, in his Catalogue, put this species down as a synonym 

 of Cosmoceras ParJcinsoni; but it is quite distinct from it, espe- 

 cially in its mode of volution. It also occurs lower, viz. in the 

 zone of Stejphan. Humphriesianum, 



Lttoceeas Etjdesianum (d'Orb.). 



Ammonites Eudesianus, d'Orb. Terr. Jurass. pi. 123. 



A. Eudesianus (d'Orb.), Quenstedt, Der Jura, tab. 54. fig. 8. 



A. Eudesianus (d'Orb.), Oppel, Juraformation, p. 373, no. 29. 



This species was for a long time put down for the Inferior 

 Oolite of this district by the name of A. cornucopia}, Young. 



Locality. It occurs in the zone of StejoJian. Humpliriesianum at 

 Oborne, but is rare. 



Lttoceeas torttlosum (Schubler) ? 



Ammonites torulosus (Schubler), d'Orb. Terr. Jurass. pi. 102. 

 figs. 1, 2. 



I have one fragment from the sands near Bridport, but am not 

 quite certain if it belongs to this species. 



Lttoceeas conftjsum, S. S. Buckman, n. sp. 



Syn. ? Ammonites jurensis, Morris, Catalogue, p. 292. 



This species approaches nearly to Lytoceras jurense (Zieten), and 

 has been quoted from this district under that name. It, however, 

 differs from it in a great number of points — namely, the shape of 

 the aperture, which is nearly trianglar, in the very square shoulder, 

 in the number of whorls, and the lobes, which are more compli- 

 cated than in L. jurense (Zieten). Inclusion is small. The test 

 is quite plain, but has a few marked lines of growth in the young 

 form, which also has not the peculiar square shoulder much marked. 



In occurs in the JSoiverbyi zone at Bradford Abbas, Halfway 

 House, Bradford Abbas railway-cutting, &c. 



At Half-way House the specimens are of an enormous size, one 

 measuring as much as 17 inches in diameter. 



The species is somewhat abundant ; but small specimens are very 

 rare. 



I have one small specimen, from Bradford Abbas, with the ter- 

 mination. It is a plain bend forward towards the ventral area. 



Dimensions. Young form, diameter 1*25 inch ; umbilicus 0*43 

 inch ; aperture, length - 47 inch, breadth 0*40 inch ; inclusion about 

 0-03 inch. 



Adult form, diameter 15*90 inches ; umbilicus 7"20 inches ; aper- 



