151 
Dr. F. Toula on the Dactyloporida. 
of the interorbital space. The spines of the fins are slender, 
the second of the dorsal slightly exceeding half the length of 
the head, and being more than twice as long as the second of 
the anal fin, which is stoutish and shorter than the eye. Uni¬ 
form silvery. 
Six specimens, from 6 to 9 inches long, were obtained. 
Belone Jonesii. 
D. 25. A. 22. 
The free portion of the tail is rather depressed, somewhat 
broader than deep, the lateral line terminating in a low black- 
coloured keel. The length of the head is less than one third 
of the total (without caudal) ; its upper surface is broad, flat, 
striated; frontal bones diverging behind, leaving a broad space 
between them which is covered by skin ; this space tapers in 
front, and is closed between the orbits. Maxillary entirely 
hidden by the prgeorbital. Jaws and teeth strong; vomerine 
teeth none ; tongue rough. The diameter of the eye is two 
thirds of the width of the interorbital space, and two fifths of 
the length of the postorbital portion of the head. Body stout, 
not much compressed; pectoral fin as long as the postorbital 
portion of the head. Ventral fin midway between the root of 
the caudal and the eye. The middle and hinder dorsal and 
anal rays subequal in length, short, the last terminating at a 
considerable distance from the root of the caudal. Caudal fin 
deeply lobed. Scales very small, irregular and adherent. 
A single specimen, 3 feet long, was obtained. 
XVI.— Remarks on Munier-Chalmas's Classification of the 
Dactyloporida* *. By Dr. Fr. Toula f- 
The segments of Cymopolia barbata, Lamx., are so nearly iden¬ 
tical with those of Dactylopora , Lamk., that the latter must be 
considered as founded on fragmentary portions of Cymopolia. 
This generic name ought therefore to be adopted, as it applies 
to complete organisms, while Lamarck’s, although a prior name, 
denotes mere fragments. Prof. Decaisne, in 1842, proved 
several marine organisms ( Cymopolia among them), which 
* “Observations sur' les Algues calcaires appartenant au groupe des 
Siphonees verticillees ( Dasycladees , Harvey) et confondues avec les Fora- 
miniferes:” note de M. Mnnier-dial mas, &c. (Comptes Rendus do 
l’Acad. des Sci. vol. lxxxv. no. 18, Oct. 29, 1877, pp. 814-817). 
t Imper. Geolog. Instit. Vienna, Report, August 31,1878. Communi¬ 
cated by Count Marschall, F.C.G.S. 
