6 BRCJOKLVN MUSEl'M .SCIP:NCE BULLETIN 3. I. 
In the descri lotions which follow this ke\-, the leiiti^th j^iveii aims to he 
that of a well j^rown adult. There is. of course, much intra-specific 
x'ariation in size. 
Citations following the technical name of each shark refer to the 
following two monograi^hic works : 
Jordan, D. .S., and E\ermann, B. \\\ The Fishes of North and Middle 
America. Bull. 47, l\ S. Nat. Mus. 1896. 
Garman, vS. The Plagiostomia ( .Sharks, Skates, and Ra>s). Mem. 
Mus. Com. Zool. XXXVI. 1913. 
The drawings have been conqnled from available figures, ])hoto- 
grai)hs, and specimens. That of Pscndotriakis iiiicivdo)/ is after Jordan 
and Evermann. In onl\' one instance, Aprionodon isodoi, is the drawing 
based on descriptions. The frontispiece of Carc/iar/ii)iiis iiiilbcrti is by 
Mr. Dwight Franklin. 
I. SMALL-TOOTHED NURSE SHARK 
/\^ntdotri(ikis iiiicrodoii Ca])ello 
Ionian and Evermann, p. 27. 
CTannan, p. 104. 
I"irst dorsal fin nuicli (7 times) lonj^er than hi,i,di. opposite the space between 
pectorals and ventrals. vSecond dorsal somewhat larger than anal, opposite that fin. 
Jaws with many rows of small tricuspid teeth. Length 10 feet. 
Two si)ecimens onl\ of this interesting large shark are known to 
science, one from Portugal, and another which came ashore at 
Amagan.sett, Februarx M, 1SS3, and was secured b>- the crew of the 
Life-Saving Station. 
