76 
8ELAC11II. 
Genus PROPRISTIS, Dames. 
[Sitzungsb. math.-phys. Cl. Akad. Wiss. Berlin, 1883, pt. i. p. 136.] 
Fragments of rostrum described as showing that the ma^in 
supporting the teeih was not calcified as in the living Pristis. ^ 
rostral teeth are also said to bo distinguished by having no 
tudinal groove upon the posterior edge; but the rostral teet o 
some living Saw-fishes (o. g. P. ewpidatm') are likewise destitu e o 
a posterior groove. 
Propristis schweinfurtJd, W. Dames, tom. cit, p. 136, p • 
figs. 1, 2, is the only known species, founded upon portions of t e 
rostrum from the Lower Tertiary of Birket-ol-Qurun, Egypt. 
Genus SCLERORHYNCHUS, nov. 
The portion of snout described below indicates a hitherto r 
recognized genus, either of the PristidiB or Pristiophoridai. 
robust character of the rostral cartilages, and the apparent a senc^ 
of prominent pre-palatine processes in advance of the nasal ® ^ 
suggest that it may most probably be placed in the first o ese 
families. The teeth of the rostrum are comparatively small an 
loosely attached to the skin. 
Sclerorhynchus atavusj sp. nov. 
Type. Imperfect rostrum, shown in PI. III. fig. _ a nd 
Each rostral tooth comprises a high round base, crimpe , a 
having a somewhat stellate appearance when viewed from benea 
upon this is fixed a baekwardly-directed enamelled “ crown, 
pressed to an anterior and posterior sharp edge. These toe a ^ 
arranged in single series upon each lateral margin of thn ® | 
increasing considerably in size towards the anterior ex rem J 
miniature tubercles, of the same kind, are also place upon 
upper surface of the base of the snout. a i, i Alma 
Form. 4 ' Toe- Upper Cretaceous (Turonian) : Sahe > 
ilount 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, whic 
become considerably enlarged anteriorly, and merit t e 
I 
