PERICYCLUS FOORDI. 141 



Pericvcll-s Foordi, G. C. Grid: Plate XXXVIII, figs. 3 a, h, 4. 



1899. Perictclus Fooedi, G. C. Crick. Ann. Mag. Nat. Hist., ser. 7, vol. iii, 



p. 430, fig. 1. 



Description. — The following is Mr. Crick's description of this species, drawn up 

 from the original specimen : — " Shell discoidal, somewhat compressed, and rather 

 \\'idel3' umbilicated ; greatest thickness at the margin of the umbilicus, rather more 

 than two-fifths of the diameter of the shell ; height of outer whorl a little more 

 than three-sevenths of the diameter of the shell. Whorls eight or nine ; inclusion 

 fully three-fourths ; umbilicus rather deep, displaying the umbilical margins of all 

 the inner whorls, about three-tenths of the diameter of the shell in width. Whorl 

 semi-elliptical in cross-section, a little higher tlian wide, indented to about two- 

 fifths of its height by the preceding whorl ; periphery convex, imperfectly defined, 

 sides feebly convex ; umbilical zone well defined, sloping towards the umbilicus, 

 and making an obtuse angle with the sides, rather narrow. 



"Body-chamber not fully seen, but occupying at least one-half of the outer 

 whorl ; aperture not seen, but the peristome (judging hj the ornaments and the 

 lines of growth) probably with a feeble lateral crest at about the middle of the 

 lateral area and a deep and wide hyponomic sinus. Depth of chamljers not seen ; 

 suture-line only imperfectly known. 



" Test ornamented with fine, backwardly directed, and somewhat irregularly 

 spaced riblets, which form rather a low crest at about the middle of the lateral 

 area, and a deep and wide hyponomic sinus on the periphery, wliere some of them 

 are thicker than the rest and somewhat regularly placed. Up to a diameter of 

 aljout 50 mm. the test is ornamented with rather coarse, regularly placed ribs, 

 Avhicli are separated Ijy interspaces a little wider than themselves, and have the 

 same direction as the ornaments of the adult." 



Supplevienfari/ DescriiAion. — By the acquisition of more nearly complete 

 specimens I am enabled to amplify Mr. Crick's diagnosis as follows : — (1 ) The 



