64 
Collection of Fish 
rays, one of them projecting beyond the rest, as in Cheilo - 
dactylus , and in the teeth, which are minute and slender, 
in a single row on the jaws. The palate, vomer, tongue, 
and pharyngeal parietes are toothless. The fins are 
scaleless, the dorsal single, the branchial rays only three 
in number, the scales cycloid, and the pyloric caeca few 
(three). There is but one specimen of Nemadactylus 
concinnus in the collection, which is three inches and a 
half long, has a compressed elliptical form, and a sparoid 
aspect. Its lateral line is marked by a series of bright 
thin scales, and beneath it, the integuments are merely 
silvery with wrinkles, as in some scomberoid fishes ; but 
the specimen has been long in spirits with other fish, and 
it is possible that the scales of the flanks may have been 
detached. If they actually existed, they must have been 
proportionably larger than those on the back, judging 
from the wrinkles of the epidermis. The scales of the 
back and top of the head are small, thin, and delicate, 
like those of a mackerel. Vertebrae 34. 
It may be thus characterized : — 
Nemadactylus, n. g. 
Piscis acanthopterygius. Operculum laeve, inerme. 
Pinnce esquamosae, pinna dorsalis unica : radii pinner 
pectoralis inferiores (sex) simplices, quorum unus 
productus. Coster hranchiosteyce paucai (tres). 
Jntermaxillarum pediculi breves. Dentes gracillimi 
minuti in ambitu oris tantum positi. Fauces palatum 
et lingua glabri. Squamce tenene, lseves, infraque 
lineam lateralem scomberoidege. Ceeca pylorica pauca 
(tria). 
JY. concinnus , species unica adhuc cognita. 
Radii : — Br .3 — 3 ; P.9et6; V. 1,6; D. 17, 28 ; A. 3, 15 ; 
C. 15|. 
10. Latris IIecateia is the appellation given by the 
author to the type of another annectant genus, which he 
