2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 76 



Type locality. — Marl at Woodstock Station on the Ingleside Mining 

 Company property, Berkeley County, South Carolina. Near 80° 5' 

 Lat., and 32° 58' Long. ; shown on Ravenels Quadrangle, United 

 States Geological Survey. The following statement has been fur- 

 nished by Mr. Sloan : 



At a depth of fifteen feet below the upper surface of the marl the specimen 

 was exhumed and given by the Superintendent to the writer, who examined the 

 pit on numerous occasions, and who considers the upper part of the Ashley- 

 Cooper marl as probably Oligocene, and the lower part, which is separated by 

 a layer of rounded pebbles in some localities, and by a layer of oyster shells in 

 others, as Upper Jackson. The upper marl is of homogeneous texture, and 

 drab green color ; and contains 74 per cent calcium carbonate ; it encloses occa- 

 sional fossil shells of which the following have been identified : Cassis 

 (Morio) petersoni Con., Ostrea trigonalis Con., Volutilithes petrosa Con., and 

 Pecten calvatus Morton. 



Dorsal viczv. — The tapering rostrum (pi. i) exhibits many modifica- 

 tions present in Squalodon calvertensis!^ Although constricted at the 

 level of the maxillary notches, the rostrum swells out in front of the 

 last molar, and then as far as preserved, gradually tapers toward the 

 extremity. The mesorostral gutter apparently was open the full length 

 of the rostrum, though the premaxillae may have approximated each 

 other very closely near the level of the first two-rooted teeth. Distally, 

 this gutter is formed by the premaxillae, which meet mesially and 

 ventrally in a linear suture in front of the alveoli for the first two- 

 rooted teeth ; proximally the vomer and the premaxillae contribute 

 to its formation. This gutter is partially roofed by the arched pre- 

 maxillae. The distal extremity of the vomer appears at the level of 

 the anterior margins of the alveoli for the first two-rooted teeth. 

 It takes part in the formation of the lateral walls of the mesorostral 

 gutter, sheathing the premaxillary bones, but the contact between the 

 vomer and the premaxilla has its posterior limit at the level of the 

 maxillary foramina. Slender remnants of the thin ascending plates 

 of the vomer are present on each side of the frontal fontanelle, but 

 they have been damaged in the region of the nasal passages. Ven- 

 trally, the external wall of the nasal passage was no doubt formed by 

 the pterygoid bone, but since both pterygoids are missing, no further 

 comments are necessary. Inferiorly the palatine bounds the nasal 

 passage, and superiorly the premaxilla contributes a portion of the 

 wall. No ascending process of the palatine appears to have been 



^ Kellogg, R., Description of two squalodonts recently discovered in the 

 Calvert Cliffs, Maryland ; and notes on the shark-toothed cetaceans. Proc. 

 U. S. Nat. Mus., vol. 62, art. 16, Publ. 2462, pi. i, 1923. 



