ART. 16, TWO SQUALODONTS FROM MARYLAND—KELLOGG. 65 
cusps. The external layer of cementum has flaked off and the ex- 
posed dentine is black in color. 
MEASUREMENTS FOR THE MOLAR. 
mm. 
Greatest length of crown. DAE RC Spon Neo Rr ROR Svcs Hea Co 8 8 NAS EY RRS (7 
Grentcctibrendtly oftcrawal: x. mein eye pee mee aa ES. . TR Dad 
Greatest height of crown (aa preserved). BOE ete te et cree pu rls Oe Diy 
In 1916 Mr. Palmer found a a of uae) of this large 
squalodont a few days after a hundred tons or more of the cliff had 
fallen on the beach. A manuscript note of Mr. Palmer found with 
the fragments states that rough weather prevented three further 
attempts to examine the talus material. He thought it was probable 
that more of the skeleton was present as most of the fractures were 
recent and it indicated that the skull was broken up by the fall. 
Specimen, No. 10695, Division of Vertebrate Palaeontology, United 
States National Museum.—This material consists of 20 fragments of a 
skull and mandible; a total of 17 alveolae can be counted in the frag- 
ments of the upper and lower jaws. Four teeth were found in the 
beach débris in the immediate vicinity of these fragments. 
Occurrence.—On the western shore of Chesapeake Bay, near South 
Chesapeake Beach, Calvert County, Maryland, near latitude 38° 40’ 
and longitude 76° 32’; shown on Patuxent Quadrangle or Patuxent 
Folio, No. 152, United States Geological Survey. 
Horizon.—The fragments were discovered by William Palmer dur- 
ing March, 1916. They were found on the shore at the water edge 
of a freshly fallen talus and were evidently from the upper brownish 
part of the cliff, or near the top of Shattuck’s zone 9. The top of 
zone 9 has been considerably eroded at this point. Shattuck’s zone 
10 is quite different in appearance, and thus the fragments may be 
assigned to zone 9 of the Calvert Miocene formation of Maryland. 
Notwithstanding the small size of this tooth (pl. 18, figs. 1a, 1b) 
there appears to be some justification for assuming that it belongs 
to the same type of squalodont as the molar discussed above. The 
base of the enamel crown is coarsely striate and the root is propor- 
tionately stouter than similar teeth of Squalodon calvertensis. The 
proportions of the tooth, the shape, curvature, and appearance of the 
enamel crown are in no way suggestive of Squalodon calvertensis. 
MEASUREMENTS FOR THE PREMOLAR. 
mm, 
Greatest Jenainiofrerdyilt cease 22... 5 oe Seam es a aN Ii Lo AIS 
Greatest breadth of crown. 4 SSO “pape aera 
Greatest length of tooth (as hesdtved) qessureae ina esteapit Vac Eesha 64.7 
A distal fragment of the left maxilla possessing three single-rooted 
alveolae suggests a long slender rostrum for this squalodont. The 
fragment:is subtriangular in oross section. On the internal side (pl. 
18, fig. 3a) and slightly above the palatal face there is a distinct 
