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*
BioStor
