^°l89i'^'] PROCEEDINGS OF THE NATIONAL MUSEUM. 131 



The teeth of the upper jaw very simikir to those of the lower. 



Color: Above, uuiforin dark browu all over, a little paler ou head; 

 below, creamy white, except outer third of pectorals, which are darker. 



TUis very interestiug species was frequently seeu by us at various 

 places iu the bay of Guaymas. It has the habit of jumping some dis- 

 tance out of the water at irregular intervals, and at such times presents 

 a very striking appearance. 



None of the teeth are worn, except those of the first three transverse 

 series. 



It is known to the local fishermen as the Gahilan. 



Two specimens were obtained by us, the measurements of which we 

 here give in millimetres: 



Numbers on specimens 



Length of disk to origin ol' dorsal tin 



W i d t h o r d i sk 



Length of tail 



Length of ventral fins 



Greatest width of ventral tins 



Greatest depth of body 



Depth of head measured over the jaws 



Width ot interorbital space 



Width between spliacles 



Length of anterior inaigin of pectoral 



Lengtli of posteiior iriargin of pectoral 



Length oi' inner margin of pectoral 



Length of free poitiou of caudal ^pLne 



Lungitiiiliual diameter of spiracle 



ViTiieal diameter of spiracle 



Diameter of eye 



Distance from eye to spiracle 



Lciigtli of free portion of cephalic fin 



Depth of notch in cephalic tin 



AVidth of mouth 



Distance of mouth from notch in cephalic fin. 

 Diat ance from mouth to vent 



64 



65 



300 



710 

 410 



80 



50 



95 1 '.»::! 



386 



700 



SL'O 



90 



55 



65 

 98 

 98 

 380 

 360 

 55 

 34 

 27 

 'JO 

 14 

 20 



18 

 60 

 70 



7.! 



107 



107 



347 



360 



55 



32 



25 



20 



13 



25 



45 



18 



GO 



05 



290 



We take great pleasure in naming this interesting species for Dr. 

 Franz Steindachner of Vienna, in recognition of his valuable services 

 to American ichthyology. 



6. Sphyrna tudes (Cuvier). 



Zyg(rua tudes Cuvier, Rt^gne Animal. Gunther, Cat. Fishes, vili, 382, 1870. 

 Sjyhjinia tu(([:s, Jordau & Gilbert, Bull. U. S. Fish Cotum. 1882, 10.5. (Name only ; 



Mazatlat). Jordan, Proc. U. S. Nat. Mus. 1885, 3(34. (Name only.) Jordau, 



Cat. Fielies N. A., 1885, <d. 



The collection contains but one specimen of this species twenty 

 inches in length. 



7. Sphyrna zygaena (L.). 



Squalus zygwiia Linuieus, Systema Nattirte, 1758, x, 399. 



Sphyrna zyyaiia, Jordau, Proc. U. S. Nat. Mus. 1885, 364 {Mazallan ; Panama); 

 Jordau & Gilbert, Proc. U. S. Nat. Mus. 1881, 32 {San Diego, California). 



One siiecimeu 2A feet long. 



y 



