PLATE XXX. 



AlPOCERAS COMPRESSDM, A. H. Foovd. 



Fig. 1 a. Lateral view of a specimen wanting onlj' a portion of the body- 

 chamber; the flattened dorsal area and the sutures are well shown, lb. Front 

 view of the same. Claue. Dublin Museum of Science and Art. (Page 116.) 



COLOCEUAS BI8TKIALE, /. PhiJUpfi, Sp. 



Fig. 2 a. Lateral view of a well-preserved specimen, showing the two fine 

 ridges that encircle the inner whorls close to the umbilical border. 2 b. Front 

 view of the same individual, showing the broad peripheral area. 2 c. Peri- 

 pheral view of the same, exhibiting on the cast of the body-chamber a sharply 

 defined impression of a former edge of the aperture, with the hyponomic sinus. 

 Toradeely South, county of Limerick. Dublin Museum of Science and Art 

 (Geological Survey Collection). (Page 115.) 



CoLOCERAS CoYANOM, A. iVOrbignij, sp. 



Fig. 3. Lateral view of the type specimen figured by M'Coy under the name 

 of Temnocheilus pinguis (' Synopsis,' pi. iv, fig. 12, which is a reversed view of the 

 fossil; it is represented correctly in my figure). Kilmallock, county of Limerick. 

 Dublin Museum of Science and Art (" Griffith Collection "). (Page 113.) 



ACANTHONAUTILUS BISPINdSUS, A. H. Foord. 



Fig. 4«. Upper edge of spine drawn to show its thickness or smaller 

 diameter; the left of the figure is the proximal end. 4/;. Proximal end where 

 broken off from the shell, designed to show the two diameters of the spine. (The 

 projection below, at right-hand side of figure, is merely matrix.) 4r. Distal 

 extremity. (Page 118.) 



