324 Mr. T. D. A. Cockerell on the 
right angles from the direction of the basal radii. This 
may, perhaps, be taken as an indication that the fish has 
evolved from a type with long scales. There is no secondary 
network or system of lines between the circuli in the apical 
field. Although Glyptophidium and Barathrodemus are 
linked together on account of the shape of their scales, they 
appear to represent quite independent developments, the 
details of the sculpture being different. 
Hypopleuron caninum, Smith & Radcliffe. Type. Near 
Kayoa I. (U.S.N.M.). 
Seales about 3 mm. long and 2 wide, rather oblong, but 
variable in form; very numerous radii all around ; nucleus 
far toward the base; apical! field without fine lines or net- 
work between the circuli; lateral and basal radii spreading 
from the nucleus, without bend or dislocation. Except in 
shape, these scales have no resemblance to those of Mer- 
luccius, which resembles Hypopleuron in the remarkable 
modification of the vertebre. 
Homostolus acer, Smith & Radcliffe. Type. Mindanao 
*(U.S.NM.): 
Seales about 4 mm. long and 2°5 broad, or smaller and 
narrower; nucleus far toward base; radu all around ; 
normal scales have no lines or network between the circuli 
in apical field, but latinucleate scales have a fine network 
apicad of the nuclear area. The lateral circuli opposite the 
nucleus are directed obliquely upward ; in Hypopleuron they 
are directed outward or only a little obliquely. The circuli 
are much denser than in Neodythites. 
Bassogigas equatoris, Smith & Radcliffe. Type. Celebes 
(ULSzN AM): 
Scales oblong, 3-3°5 mm. long, 2—2°25 broad ; nucleus 
subbasal ; radii all around, lateral not bent, but many in- 
complete ; apical region with a fine secondary network. 
The subbasal nucleus at once separates this from the scales 
of the Bythitine. 
Neobythites steaticus is described in Proc. Biol. Soc. Wash. 
XaWie pa 10. 
The species of Neobythites have elongated scales with 
broadly rounded ends; nucleus far basad ; radii numerous, 
