PLATE VI. 



Orthocehas hibernicum, .4. H. Foord. 



Fig. Irt. Specimen almost entirely covered with the test. 1/'. Longitudinal 

 section of the same, showing in the lower part the somewhat inflated siphuncle. 

 1 c. Septum showing the siphuncle. 1 il. The same nearer the apical end. 

 1 ('. The ornamentation enlarged. Clane. Dublin Museum of Science and Art. 

 (Page 19.) 



Okthoceuas PULCHEEKiMUir, A. H. Foord. 



Fig. 2 a. Fragment consisting of nearly' the whole of the body-chamber and 

 some of the septa. 2 h. Longitudinal section of the same. 2 c. Portion of the 

 test greath' magnified. Clane. Dublin Museum of Science and Art. (Page 19.) 



Orthuceras Kildarense, a. H. Fuord. 



Fig. o a. Fragment composed of the body-chamber and five septal chambers. 

 3 h. Section of the same showing the siphuncle. 3 c. Fragment of another 

 individual, with part of the test preserved. 3 d. Part of the test enlarged. 

 Clane. Dublin Museum of Science and Art. (Page 17.) 



Orthoceras salvum, L. G. de Koninck. 



Fig. -ill. Specimen completely- covered with the test. -ib. The test magnified. 

 Doohyle. Dublin Museum of Science and Art. (Page 18.) 



