PLATE XXII. 



Triboloceras formosum, sp. nov. 



Fig, 1. Lateral view of a large imperfect specimen, showing the prominent, 

 spiral, creuulatecl ridges. Lisbaiie. Dublin Museum of Science and Art 

 (Geological Survey Collection). (Page 75.) 



Fig. 2. Peripheral view of a young individual, showing the strong ridges and 

 deep furrows. Garrihies (Kerry). Dublin Museum of Science and Art (Geological 

 Survey Collection). (Page 75.) 



Vestinautilus semiglabeb, sp. nov. 



Fig. 3. Lateral view of an adult (?) individual with most of the body-chamber 

 present, and showing the highly crenulated lateral ridges and the smooth area 

 facing the umbilicus. Lisbane. Dublin Museum of Science and Art (Geological 

 Survey Collection). (Page 78.) 



Fig. 4 a. Lateral view of a younger individual, showing (too indistinctly in the 

 figure) the septa on the inner whorls. (The outline of this figure is a little 

 distorted; this is erroneous, as the specimen is perfectly symmetrical.) 41. Peri- 

 pheral view of the same, showing rather faint ridges. 4 c. Transverse section 

 (diagrammatic — the two oblique lines at the lower part of the figure representing 

 the smooth area are made a little too short). Lisbane. Dublin Museum of Science 

 and Art (Geological Survey Collection). (Page 78.) 



Vestinautilus crassimarginatus, sp. nov. 



Fig. 5 a. Lateral view of a large and nearly perfect individual, showing tfic 

 heavy rim bordering the umbilicus and the fine and regular lines of growth 

 covering the test. 5 b. Front view of the same. (Note the curvature of the lines 

 of growth in crossing the periphery.) 5 c. Diagrammatic transverse section, 

 showing the position of the siphuncle. Little Island. Dublin Museum of Science 

 and Art. (Page 79.) 



