128 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



low snout. Spiracle small or obsolete. Two dorsals, spineless; first 

 fin short, elevated, entirely before ventrals ; second fin small, opposite 

 anal. Tail mostly bent up from caudal base, sides without keel. 



The majority of sharks belong with this family. At least usually 

 one and frequently several members occur on most every temperate 

 or tropical coast of the globe. Many of the species are very closely 

 related, some with great similarity of appearance or the distinguish- 

 ing characters subtle and hard to define. A few are cosmopolitan, 

 and most all are of generalized sharklike aspect. Both among living 

 and fossil forms, which are known since the early Tertiary, the teeth 

 have usually been used as the basis of classification. 



The following may belong in this family, known only from jaws 

 in the Royal College of Surgeons, according to Whitley and at pres- 

 ent indeterminable : 



Genus GALEOLAMNA Owen 



Oaleolamna Owen, Cat. Osteol. Roy. Coll. Surg., vol. 1, p. 96, No. 427, 1853. (Type, 

 Oaleolamna greyi Owen.) 



GALEOLAMNA GREYI Owen 



Oaleolamna greyi Owen, loe. cit. (type locality: South Australia). — Whit'let, 

 Ree. Australian Mus., vol. 18, p. 324, 1932; Mem. Queensland Mus., vol. 10, 

 pt. 4, pp. 185, 198, 1934 (reference). 



ANALYSIS OF GENERA 



a\ Galeobhininae. Teeth compressed, triangular, a single series functional. 

 &\ Spiracles absent. 

 o\ Teeth with entire edges. 



d\ Teeth with swollen bases, cusps slender, oblique Physodon 



dl Teeth without swollen bases. 



e\ Teeth with oblique cusps in both jaws Scoliodon 



e". Teeth with cusps rather slender, upper nearly erect, lower erect. 



Aprionodon 

 <f. Teeth only serrated on bases of those in upper jaw ; lower teeth entire. 



Hsrpoprion 

 cl Teeth all serrated, at least some or all on bases and cusps. 



f. First dorsal near pectorals Eulamia 



f. First dorsal near ventrals Glyphis 



Ir. Spiracles minute. 



g^. Teeth entire, oblique, notched, subequal in jaws Loxodon 



g'. Teeth only denticulated in upper jaw ; labial folds on both jaws. 



Hemigaleus 

 g'. Teeth serrated in both jaws, large, subequal, oblique ; labial fold 



along upper jaw Galeocerdo 



b*. Spiracles small, oblique ; teeth short, serrated, notched, oblique ; caudal 



pits rudimentary ; subcaudal short Galeorhinus 



ft*. Spiracle large ; teeth triangular, both coronal edges becoming coarsely ser- 

 rated toward apex Hemipristis 



