5 ^; 
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^rr% 
/z**/ ***** /***•- 
SELACHII. 
Genus PROPRISTIS, Dames. 
[Sitzungsb. math.-phys. Cl. Akad. Wiss. Berlin, 1883, pt. i. p. 136.] 
Fragments of rostrum described as showing that the margin 
supporting the teeth was not calcified as in the living Pristis. The 
rostral teeth are also said to be distinguished by having no longi¬ 
tudinal groove upon the posterior edge; but the rostral teeth of 
some living Saw-fishes (e. g. P. cuspidatus) are likewise destitute of 
a posterior groove. 
Propristis schweinfurthi, W. Dames, tom. cit. p. 136, pi. iii. 
figs. 1, 2, is the only known species, founded upon portions of the 
Genus SCLRRORHYNCHUS, nov. 
The portion of snout described below indicates a hitherto un¬ 
recognized genus, either of the Pristidse or Pristiophoridae. The 
robust character of the rostral cartilages, and the apparent absence 
of prominent pre-palatine processes in advance of the nasal capsules, 
suggest that it may most probably be placed in the first of these 
families. The teeth of the rostrum are comparatively small and 
loosely attached to the skin. 
u 
rostrum from the Lower Tertiary of Birket-el-Qurun, Egypt 
Sclerorhynchus atavns, sp. nov. 
Type. Imperfect rostrum, shown in PI. III. fig. 1. 
Each rostral tooth comprises a high round base, crimped, and 
having a somewhat stellate appearance when viewed from beneath; 
upon this is fixed a backwardly-directed enamelled “ crown, \ com¬ 
pressed to an anterior and posterior sharp edge. These teeth are 
arranged in single series upon each lateral margin of the snout, 
increasing considerably in size towards the anterior extremity ; 
miniature tubercles, of the same kind, are also placed upon the 
upper surface of the base of the snout. 
Form. Sf Log. Upper Cretaceous (Turonian) : Sahel Alma, 
Mount Lebanon, Syria. 
P. 4776. Type specimen. The snout is broken away from the head 
at the level of the nasal capsules, and only one of these is 
imperfectly displayed. The outline of the skin is indicated 
by the marginal series of pointed dermal tubercles, which 
become considerably enlarged anteriorly, and merit the 
