PLATE XXXII. 



Pig. Page. 



1. Protosphyrxna ferox, Leidy ; anterior end of right mandibular ramus, 



outer, (1 a) upper, and (1 b) end views. — Chalk; Kent. Bowerbank 

 Collection (B. M. no. 39438). d,, dentary ; spl, splenial. 1 II I. 



2. Protosphyrssna sp. ; hypural bone, showing anterior process (p.) and a 



few overlapping fin-rays (r.), two thirds nat. size. — Chalk; Sussex. 

 Egerton Collection (B. M. no. P. 1483). 150. 



3. Ditto; hypural bone, showing large anterior process (p.), two thirds 



nat. size. — Cambridge Greensand. B. M. no. 351(30 a. 150. 



4. Ditto; portion of pectoral fin, two thirds nat. size. — Zone of Holaster 



subglobosas ; Merstham, Surrey. B. M. no. 41070. 150. 



5. Ditto ; preaxial portion of upper end of left pectoral fin, showing the 



rays (r.) clasping the first and second baseosts (r, n), anterior and 

 (5 a) upper views. — Chalk; Kent. Toulmin Smith Collection 

 (B. M. no. 41695). 150. 



0. Ditto; portion of left pectoral arch with base of fin, posterior and (6a) 

 inner views, two thirds nat. size. — English Chalk. B. M. no. 

 P. 7573. cl., clavicle; cor., coracoid ; /., vacuity; pc, pre- 

 coracoid ; v., fin-rays ; sc, scapula; vm, eighth baseost. 150. 



Unless otherwise stated, figures are of the natural size. 



