PLATE XLII. 



Gltphioceras (s.-g. Sphenocekas) sph^ricum, W. MaHin, sp. 



Fisr. 1 a. Lateral view of the cast of a small specimen, showing the suture-lines with great clearness. 

 1 6. Peripheral view of the same. Near Bantrj-. Mr. Joseph Wright's Collection. (Page 154.) 



Fig. 2. Lateral view of an entirely septate specimen, showing constrictions. Ireland (exact 

 locality not known).- British Museum (No. 25,294). (Page 154.) 



Gltphioceras (s.-g. Sphenoceras) striatum, J. Sowerby, sp. 



Fig. 3. Periphero-lateral view of a wholly sejitate fragment, embedded in the rock, showing a 

 shallow constriction. Fig. 4. Crushed specimen, showing the ornamentation and constrictions. 

 Courtlough. Dublin Museum of Science and Ai-t (Geological Sm-vey Collection). (Page 160.) 



Gltphioceras (s.-g. Sphenoceras) ckenistria, /. Phillips, sp. 



Fig. 5. Lateral view of a septate specimen with fragments of test. Ireland (exact locality not 

 known). British Museum (Morris Collection — No. 50,183). (Page 157.) 



Fig. 6. Suture-line, taken from fig. 76 of 'Cat. Foss. Ceph. Brit. Mus.,' pt. 3, 1897, p. 161. 

 Bollaud (Lancashire). British Museum (No. C. 5080). (Page 157.) 



Gltphioceras (s.-g. Betrichoceras) obtusum, J. Phillips, sp. 



Fig. 7 a. Lateral view of a specimen distorted into an ellipse nearly at right angles to the aperture. 

 7 6. Peripheral view of the same. 7 c. Suture-lines of the same. Little Island. Dublin Museum of 

 Science and Art. (Page 163.) 



Fig. 8 a. Lateral view of an uudistorted specimen. 8 b. Front view of the same, showing sutures 

 artificially exposed. 8 c. Suture-lines of the same. BaJlynaearriga. Dublin Museum of Science and 

 Art (Geological Survey Collection). (Page 163.) 



Fig. 9 a. Lateral view of a specimen of what is probably the young of this species. 9 b. Front 

 view of the same. 9 c. Peripheral view of the same. Ballynacarriga. Dublin Museum of Science 

 and Art (Geological Survey Collection — No. 452). (Page 163.) 



Gltphioceras (s.-g. Muensteroceras) crassum, sp. nov. 



Fig. 10 a. Lateral view of the type specimen distorted into an ellipse parallel with the aperture ; 

 the sutures artificially exposed. 10 6. Peripheral view of the same. 10 c. Suture-lines of the same 

 drawn in plan to show both sides. Ballynacarriga. Dublin Museum of Science and Art (Geological 

 Survey Collection— No. 547). (Page 193.) 



