PLATE XIII. 



EusTHENOCERAS HuLLi, L. G. (le Konincl; sp. 



Figs. 1 a, 1 h. A large specimen, imperfect at both ends, but with the greater 

 part of the bod3'-chamber preserved ; the letters n h, a h, show where the two 

 halves of the figures join. 1 c. Part of the same specimen, showing the arching 

 of the sutures (in the anterior direction) and the distinct median or " normal " 

 line. 1 d. Section taken from the apical part of the shell, showing the septa and 

 their necks (upper part of the figure ; but the necks are drawn with too narrow 

 a space between them where the siphuncle would pass through). Obscure lines 

 indicate where the siphuncle has been, but its form cannot be made out. 1 e. 

 Transverse section, showing a little circle just above the centre which indicates 

 the position of the siphuncle, but not quite so clearly in the specimen as in the 

 drawing. Oldtown. Museum of Trinity College, Dublin. (Page 39.) 



