60 H. H. SWINNERTON, 
almost horizontal and lies with its anterior end on a level with the spine 
of the twenty second vertebra; and its posterior with that of the twenty 
fourth. This fin has seven of these elements whilst the a has six. 
The first radial of the 
former bears four der- 
mal rays, that of the 
latter bears five. The 
other radials bear one 
each. 
The corresponding 
fins of Galaxias have 
ten and sixteen radials 
respectively. In each, 
the anterior ones are 
trisegmental, the pos- 
terior bisegmental, and 
all are ossified. 
Fig. B+). Lateral view 
of head skeleton of Cromeria. 
2a 
Fig. C. The same, of 
Galawias. 3 : 1. 
an angular, ar articular, 
as alisphenoid, d dentary, 
e.p.b parethmoid bone, fr 
frontal, hym hyomandibular, 
hy.h hypohyal, ma maxilla, 
na nasal, o.e epiotic, o.p 
pterotic, 0.sp sphenotic, oc. s 
supraoceipital, oc.e exoceipi- 
tal, op operculum, op. inter- 
operculum, 0p.s subopercu- 
lum, op. pr preoperculum, par 
parietal, pg pterygoid, pgm 
metapterygoid, ps parasphe- 
noid, pmx premaxilla, qu qua- SANT 
drate, so suborbital, sym sym- an. qu. | \ 
plectic, « fused mesethmoid, sym. pgm. opt. 
nasals and suborbitals. 
In Cromeria the ribs, which are present on all the precaudal 
vertebrae except the first, articulate, with processes on the second 
centrum, and with the centra themselves on the rest. A simple epi- 
pleural is attached close to the head of each rib. 
1) All figures of Cromeria, except the first, are made from wax 
reconstructions; those of Galaxias, from dissections. 
