Table of Contents 



INTRODUCTION XI 



Mai 



XIV 



SAWFISHES, GUITARFISHES, SKATES and RAYS, 



By Henry B. Bigelow and William C. Schroeder I 



Acknowledgments I 



General Discussion 2 



Subclass Elasmobranchii 4 



Order Batoidel 4 



Suborder Pristoidea 15 



Family Pristidae 18 



Genus Pristis 18 



Pristis pectinatus 23 



Pristis perotteti 34 



Suborder Rhinobatoidea 43 



Family Rhynchobatidae 44 



Family Rhinobatldae 46 



Genus Rhinobatos ^O 



Rhinobatos horkelii 56 



Rhinobatos lentiginosus 60 



Rhinobatos percellens 6 8 



Genus Rhinobatos Addendum 73 



Rhinobatos spinas us 73 



Genus Zapteryx 74 



Zapteryx brevirostris 75 



Suborder Torpedinoidea 80 



Family Torpedinidae 87 



Genus Torpedo 90 



Torpedo nobiliana 96 



Genus Narcine 107 



Narcine brasiliensis ill 



Genus Diplobatis 123 



Diplobatis pictus 1 24 



Genus Benthobatis 126 



Benthobatis marcida 128 



Suborder Rajoidea 132 



Family Rajidae 133 



