68 DR. A, GUNTHER ON THE ZOOLOGICAL [Feb. 6, 
equal to the length of the head and rather more than one third of 
the total length (without caudal). Upper profile sloping in a mode- 
rately strong curve from the commencement of the dorsal to the end 
of the snout. Lower jaw the longest. The teeth are in strong card 
in both jaws, the upper jaw with an outer series of stronger ones ; 
one pair of canine teeth above and below, much stronger than any 
of the other ones. Vomerine and palatine teeth in narrow short 
bands. ‘The diameter of the eye is one half the length of the snout, 
and two thirds of the width of the interorbital space. The maxillary, 
when the mouth is closed, reaches to behind the middle of the orbit. 
The structure of tie nostrils does not differ from that of the other 
species of the genus: there are externally on each side two openings, 
a small anterior, and large posterior ; they are separated by a narrow 
bridge of skin, which, in dried examples, would be very liable to 
shrink or disappear altogether. At the bottom of the posterior 
opening are the two apertures described by Jenyns which lead into 
the interior of the nasal organ. 
The preoperculum is rather more than rectangular, the basal 
margin nearly straight and horizontal, the ascending margin finely 
denticulated with a shallow sinuosity above the angle. Operculum 
with a flat triangular spine. 
Seales nearly smooth, lateral line not very conspicuous. 
Dorsal spines slender, the second being the longest, its length 
contained twice and one fourth in that of the head. The length of 
the first spine is four ninths of that of the second, the third, fourth, 
fifth, and sixth spines gradually decreasing in length. Candal sub- 
truncated. Body uniform dark brown. Head and fins yellow. 
3. SERRANUS HUMERALIS (C. V.). 
=8. albomaculatus (Jen.), Charles Island. 
4, PristrpoMA CANTHARINUM (Jen.). Charles Island. 
5. CHRYSOPHRYS TAURINA (Jen.). Charles Island. 
Very closely allied to Ch. calamus. 
6. SarGcus UNIMACULATUs (BI.). Charles Island. 
This fish is to be added to the list of species occurring on both 
sides of the Isthmus of Panama. Hitherto it was known from the 
Atlantic coasts of Tropical America (including the West Indies) 
only. 
7. DoyDIXODON FREMINVILLII (Val.). Charles Island (Post- 
Office Bay). Albemarle Island (Iguana Cove). 
The number of dorsal rays varies from 15 to 17; that of the anal 
rays appears to be more constant, namely 12. With regard to the 
distribution of this fish on the Pacific side of the American conti- 
nent, and the alleged presence of teeth on the palate, see Zool. 
Record, iv. p. 160. 
