SOME NEW SPECIES OF AMMONITES. 141 



CosMocERAS Hollands, ITohis, plate i., fig. 2 a-b., and plate ii., 



fig. 2 a. 



Whorls somewhat numerous ; inclusion small ; ornamentation, 

 rather sharp ribs, running straight across the side and terminat- 

 ing in a small spine on the ventral area. Eibs not joined 

 across, but the ventral area has a deep furrow along the middle. 



This peculiar and distinct species is rather scarce. I possess a 

 few specimens from undercliff, Burton Bradstock, Dorset, of 

 which the specimen figured plate i., fig. 2, is the largest. 



Positio7i, zone of Harpoceras Murckisonce. 



Nearest Allied Form. — Cosmoceras subfurcattim (Schloth), Cosm. 

 Niortense, d'Orb, from the Sumphriedmmm zone. It differs from 

 this species in possessing only primary ribs, no trace of any row 

 of spines on the sides of the whorls, and much fiatter, straightor 

 sides. 



On plate ii., fig. 2 a, is represented a more numerously ribbed 

 variety of this species. It is from the zone of Harpoceras 

 MwcMsonce, at a quarry near Sherborne, Dorset. 



Sphaeroceeas Manselii, J. Buchnan, plate ii., fig. 3 a-b. 



1881. Ammonites Manselii, /. Buck., Quart. Jour., Geol. Soc, page 64, 

 No. 11. 



1881. Sphaeeoceeas Manselii, S. S. Buck., Quart. Journal, Geol. Soc, 

 page 597. 



Shell globose. Whorls few and entirely occluded. Primary 

 ribs small and rounded, generally bifurcating. Mouth-bor- 

 der with a deep furrow and a broad lip ; where the test is absent 

 the furrow is deeper. The body chamber just by the termina- 

 tion is much flattened on the ventral area. 



This species is very rare, only two specimens, as far as I 

 know, having been obtained by Mr. T. C. Maggs, from Clat- 

 combe, near Sherborne, Dorset, which quarry is now closed. 



Position, probably zone of Stephan. Humphriesianum. 



Nearest Allied Form. — Sphaeroceras Brongniarti (Sowerby) 

 from the Humphriesianum zone. Our species, however, differs 



