874 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY — IV. 
Page 24. Instead of Aprionodon imnctatus read : 
29. A. isodou (Miill. & Henle) Gill. 
It is doubtful whether this species has ever been taheu on our coasts. 
The name ininctatus is ver^’ doubtfully applied to this species, as the 
Squalus ininctatus of Mitchill is as likely to have been C. terrccnovce. A. 
isodoii should be sujDpressed from our lists until its alleged occurrence 
ill our waters is verified. 
On page 25, the genus Reniceps is probably unworthy of retention, 
and it should be reunited to Spliyrna. The characters to be assigned to 
the genus Spliyrna are included under the account of the family. Spe- 
cies 31 should be — 
S. tiburo (L.) Eaf. 
The correct reference to the description of Spliyrna is — 
(Rafinesque, ludice d’Ittiol. Sicil. 1810, 46.) 
On page 27, family X should be Odontaspididce. Its single genus may 
stand as — 
25.— ODOATASPIS Agassiz. 
(Agassiz, Poissons Fossiles, iii, 87, 1836: type Squahis ferox 'Risso.) 
The xYiuerican species should stand as — 
31. O. littoralis (Mitch.) J. & G. 
The prior name americanus (Mitch.) was the result of an error of 
identification. 
Page 28. Instead of Isurus glaucus read: 
35. I. dckayi (Gill) J. & G. 
Dark bluish-gray aboce, white below, the color abruptly changing on 
the tail; upper fins dusky, lower pale. Head 5 in length to tip of cau- 
dal ; pectoral as long as head, a little longer than upper caudal lobe. 
Dorsals and i)ectorals falcate ; first dorsal inserted behind pectoral at a 
distance equal to one-fourth head; base of dorsal 2^ in head, its height 
If. Middle teeth very long, much longer and narrower than lateral 
teeth. Length 10 feet. Car)e Cod to West Indies. The American spe- 
cies seems to differ from the Asiatic I. glaucus in its longer i^ectorals 
and higher dorsal. 
{Lamna punctata Dekay, New York Fauna, Fislies, 1842, 352 (not Squalus punctatus 
Mitch.) : Isuropsis dekaiji Gill, Am. Lyc. N. Y. 1858, 153 : Isuropsis glaucus Poey, Synops. 
Pise. Cubens, not Oxyrhina glauca M. & II. ?) 
Page 29. Instead oH Isurus oxyrhynclius read: 
36. I. spallaiizaiiii Raf. 
This species should be erased, as there is no evidence of its occurrence 
