PLATE XVII. 
1 Tl g- Page 
1. Scapanorhynchus lewisii (Davis) ; abdominal and caudal 
regions, lateral aspect, two thirds nat. size.—Senonian ; 
Sahel Alma, Mt. Lebanon, an. Anal fin. c. Caudal 
fin. d 2 . Posterior dorsal fin. pet . Pectoral fin. plv. 
Pelvic fin. [P. 4020 .] 352 
2. Ditto; head and branchial region, inferior aspect, two 
thirds nat. size.—Ibid. [49474.] 352 
3. Ditto ; crown of anterior tooth, lateral aspect, three times 
nat. size.—Ibid. [49551.] 352 
4. 5. Ditto ; two anterior teeth, inner and outer aspects, three 
times nat. size.—Ibid. [49473.] 351 
6. Ditto; lateral tooth, outer aspect, four times nat. size.— 
Ibid. [48099.] 351 
7. Ditto ; posterior tooth, outer aspect, four times nat. size. 
Ibid. ‘ [49475.] 352 
8. /S 'capanorhynchus elongatus , sp. nov.; head and anterior 
portion of trunk, inferior aspect, two thirds nat. size.— 
Ibid. [P. 4774.] 353 
9-21. Oxyrhina mantdli , Agassiz ; associated series of thirteen 
teeth, outer and inner aspects.—Chalk; Grays, Essex. 
[32347, 39434.] 378 
