PLATE XVI. 



PoTEKIOCEliAS LATISEPTATUM, Sp. IIOV. 



Fig. 1 a. A nearly perfect specimen wanting only a small portion of the apex. 

 1 h. Transverse section of the same showing the siphuncle. 2 a. Lateral view of 

 another specimen. 2 h. Ventral view of the same. 2 c. Section of the same, 

 showing the position of the siphuncle. 3 a. Lateral view of an imperfect 

 specimen, showing the widely spaced septa. 3 h. Transverse section of the same, 

 showing the position of the siphuncle. The elliptical form of the section is 

 artificial, being due to the specimen having been ground and polished to show the 

 sutures which were covered by the test. 4. Longitudinal section showing the 

 siphuncle (this section was unfortunately not cut through the centre of the 

 siphuncle, whose elements therefore appear oval and less than their full size would 

 be). The last three chambers are extremely shallow. Clane. (Figs. 1, 3, and 4). 

 County of Limerick (exact locality unknown — fig. 2). Dublin Museum of Science 

 and Art. (Page 45.) 



