Dr. A. Gunther on new American Fishes. 227 



prolonged, tubifonn, 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, 

 hut 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, tJie 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 PeTERSII. 



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 CaUbar. 



On some New Species of Central-American Fishes. 

 By Dr. A. Gcnther. 



Our Corresponding Member Capt. J. M. Dow having sent to this 

 Society a second collection of Central-.\merican 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 1 am engaged at present 

 or shall be in a very short time : — 



I. Species collected on the Pacific Coast of Panama. 



1. SbRRANUS 8ELLICAUDA, Gill, Sp. 



2. Rhypticvs MACULATU8, Holbr. 



3. Mesoprion NovEM-PAsciAxrs, Gill, sp. Very closely allied 

 to M. griseus. 



4. Mesoprion, 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. Pristipoma Dovii, n. sp. 



D. JJ. A. \. L. lat 48. L. transv. 8/15. The height of the 

 bod yis one-half of the total length (without caudal) ; the length of 



15* 



