PLATE XLII. 



Gltphioceras (s.-g. Sphenoceeas) sph^ricum, W. Martin, sp. 



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

 1 b. Peripheral view of the same. Near Bantry. 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, /. Sowerby, sp. 



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

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

 Courtlough. Dublin Museum of Science and Art (Geological Survey Collection). (Page 160.) 



Gltphioceras (s.-g. Sphenoceras) crenistria, J. 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. 

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



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



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

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

 Science and Art. (Page 163.) 



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

 artificially exposed. 8 c. Suture-lines of the same. Ballynacarriga. 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 b. 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.) 



