Dr. A. Giinther on new American Fishes. 207 
prolonged, tubiform, slightly tapering, and curved downwards, the 
distance between the eye and the end of the mandibular flap being 
twice that between the eye and the gill-opening. The mouth is very 
small, at the extremity of the snout, with the jaws equal, and armed 
with two pairs of feeble conical teeth above and below. The mandi- 
bulary flap is as long as the eye. The eye is covered with the skin, 
but appears through from below it. The pectoral is nearly twice as 
long as the ventral, and extends beyond its base. The dorsal and 
anal fins are opposite each other, and placed on the caudal portion 
of the body, the origin of the former being in the middle between 
the occiput and the root of the caudal. The scales on the trunk are 
rather small and irregularly arranged, but become gradually larger 
and more regular posteriorly. Coloration uniform. 
The single specimen obtained is 10 inches long. 
We add, for comparison, the diagnosis of the other species men- 
tioned above :— 
Mormyrus Peters. 
D. 27. A. 34. L. lat. 66. The mandible is prolonged into a 
long, conical fleshy appendage, which is nearly half as long as the 
head. Dark brown, with two lighter cross bands. 
Hab. Old Calabar. 
On some New Species or CENTRAL-AMERICAN FISHES. 
By Dr. A. GUNTHER. 
Our Corresponding Member Capt. J. M. Dow having sent to this 
Society a second collection of Central-American Fishes, a complete 
series of the species contained therein has been deposited by our 
Secretary in the British Museum. The following is a list of those 
which I have examined, a few others having been omitted, as they 
belong to families in the revision of which I am engaged at present 
or shall be in a very short time :— 
I. Spectes collected on the Pacific Coast of Panama. 
1. SERRANUS SELLICAUDA, Gill, sp. 
2. Ruypricus macutatus, Holbr. 
3. MrsoprioN NOVEM-FASCIATUS, Gill, sp. Very closely allied 
to M. griseus. 
4. Mrsoprion, n. sp. There are two young specimens of an 
apparently undescribed form in the collection ; but the description 
and determination are better deferred until more examples have 
been obtained. 
5. PRISTIPOMA MELANOPTERUM, C. & V. 
6. Pristrpoma Dovtit, n. sp. 
D. = Hae > L. lat. 48. L. transv. 8/15. The height of the 
bodyis one-half of the total length (without caudal) ; the length of 
15% 
