2()2 VERTEBRATE ANIMALS OF SOUTH CAROLINA. 



SPHYRNID.E. 



HAMMER-HEADED SHARK. Sphyrna zygaena, (Linni) 31. and H. 

 SHOVEL-HEAD SHARK ; BONNET-HEAD. Reniceps tiburo, (Liniiej Gill. 



GALEORHINID.E. 



SHARP-NOSED SHARK. Scoliodon terras-novse, ( Rich.) Gill. 

 SHORT-NOSED SAW-TOOTH. Hypoprion brevirostris, Puey. 

 SMOOTH HOUND ; DOG-FISH. Mustelus hinnulus, f Blainv.) J. and G. 



GINGLYMOSTOMATID^. 

 NURSE SHARK. Ginglymostoma cirratum, (Gmel.) M. and H. 



CLASS LEPTOCARDII. LEPTOCARDIANS. 



A class of aquatic vertebrate animals in which the skull is undevel- 

 oped, being represented by a continuation of the cartilaginous back-bone 

 (notochord). The brain and the heart are not developed. 



A very limited group of rather rare animals, the lowest of the verte- 

 brates, connected witli the fishes, in a systematic arrangement, through 

 the class 3Iarsipo branchiates, or lamprey, eels and hog-fishes. All are 

 marine. The following species belong to the order Clrrostomi : 



BRANCHIOSTOMID.E. 

 LANCELET. Branchiostoina lanceolatum, (Pallas) Gray. 



