136 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 



consideration. At fig. 26, a, a few of the rhomboidal "fields" are 

 shown natural size, with their subcordate prominent cushion, 

 considerably upraised, and containing faint traces of an almost 

 central scar, within which is a slightly elongate vascular cicatrice 

 placed near its lower margin. Immediately below this upraised 

 cushion, and attached as it were to its outer side, is a triangular 

 ridge-like elevation containing a small pit. That this small pit 

 is situated on the lower margin of the raised cushion is proved 

 by the fact that the rhomboidal areas and scars increase in size 

 as we recede from this end of the specimen. At b is given an 

 enlarged drawing of one of these areas to show the parts more 

 clearly. The " field " is indicated by the a, the prominent 

 cushion with slightly raised-up border at b, and its contained scar 

 at c, whose vascular cicatrice is placed slightly below the centre. 

 At d is the small pit-like cicatricule. Fig. c gives a few of the 



Fig. 26. — Omphalophloios anglicns, Sternb. sp. a to e, from different 

 portions of the same specimen (No. 426) ; f and g, portions 

 of another example (No. 433) ; a, c, and f, natural size ; 

 b, d, e, g, enlarged — all from Camerton, Somerset. For 

 explanation of lettering see text. 



