326 NEW-YORK FAUNA. 



THE HAIRY BALLOON-FISH. 



DioDON pir.osus. 



PLATE LV. FIG. 180. — (CABINET OF THE LYCEUM.) 



The Hairy Diodon, Diodm pilostu. Mitchill, Trans. Lit. and Phil. Soc. Vol. 1, p. 471, pi. 6, fig. 4. 

 Diodm aaper ? CuTiER, Memoires du Museum d'Histoire Naturelie, Vol. 4, p. 138. 

 D. piloma. Id. R^gne Animal, £d. anglaise, Vol. 10, p. 567. 



Characteristics. Body with long flexible setaceous spines. Caudal pointed. Length two to 

 four inches. 



Description. Body oblong, cuboidal. Every part of the surface, except a small space 

 round the mouth and eyes, and another including the base of the caudal fin, furnished with 

 bristles ; these are from two to four-tentlis long, directed backwards, though probably capable 

 of erection at the will of the animal. They are somewhat longer and more crowded on the 

 dorsal and posterior parts of the body ; they are all soft and flexible, suggesting the idea of 

 hair-like processes. Eyes large and lateral ; the space between the orbital margins depressed, 

 concave. Nostrils single, with an obliquely truncated tubular orifice. Mouth terminal, 

 broad, with thin membranous lips. Jaws, or rather the teeth, ending in an acute tip in front. 

 Branchial orifice ear-shaped, placed in front of the upper part of the base of the pectorals. 

 The dorsal slightly anterior to, but over the anal ; rounded on its margin, higher than wide. 

 Pectoral short and broad ; its upper rays longest. Anal fin broad, and similar in shape to the 

 dorsal. Caudal lanceolate. 



Color. Brownish above ; ashy white beneath ; the prickles of a metaUic golden color. On 

 the back and along the sides are several oblong, distant, blackish brown spots. 



Length, 2-0. 



Fin rays, D. 12; P. 20; A. 14; C. 9. 



This remarkable little species, which has been occasionally taken in the bay of New- York, 

 was first described by Mitchill. It was subsequently referred by Cuvier (Op. sup. cit.) as 

 the young of a species which he names asper, two feet and a half long. It is probable that 

 his opinion underwent some modification subsequent to the publication of that paper ; for in 

 the last edition of his Regne Animal, D. pilosus is cited as a distinct species. 



