PLATE XIX. 



0(ELONAUTILUS PLANO'I'ERGATUS, F. M'CoiJ, Sp, 



Fig. 1 a. Lateral view of the distorted and imperfect specimen figured by 

 M'Coy in the 'Synopsis' (pi. ii, fig. 2). 16. Peripheral view of the same, 

 showing the sutui-es of the septa. Cork (near the city). Dublin Museum of 

 Science and Art (" Griffith Collection "). (Page 58.) 



Fig. 2 a. Part of inner whorl of another specimen, showing sutures of the 

 septa. 2 h. Part of penultimate whorl of the same, showing the impressed zone, 

 with the mark of the sutures of the inner whorl, which it overlaps. 2 c. Dia- 

 grammatic section showing the position of the siphuncle. Rathkeale. Dublin 

 Museum of Science and Art (Geological Survey Collection). (Page 53.) 



CCBLONAUTILUS DoOHTLENSIS, sp. UOV. 



Fig. 3 a. Lateral view of an imperfect specimen. 3 h. Peripheral view of the 

 same, showing the fine ridges. 4 a. View of the septal surface of another 

 individual, showing the position of the siphuncle. 4 h. Profile view of the same. 

 Doohyle. Dublin Museum of Science and Art. (Page 56.) 



Planetocbras olobatum, J. de G. Sowerhy, sp. 



Fig. 5 a. Lateral view of an adult individual. 5 b. Front aspect of the same. 

 About three-fourths of the natural size. "Kildare" (pi'obably Clane). British 

 Museum. (Page 96.) 



Fig. 6. Lateral view of a young and perfect individual. St. Doulagh's. My 

 Collection. (Page 96.) 



