1869. ] SURGEON F. DAY ON INDIAN FISHES. 553 
fin, which last is slightly emarginate. Pectoral extends three- 
quarters of the distance to the ventral, and the latter halfway to 
the anal. Upper margin of dorsal fin straight. 
Scales minute. 
One specimen, 2 inches long, is in the collection, received from 
Major Berdmore, who obtained it at Pegu. 
Two specimens of the Homaloptera maculata are in the collection ; 
they were obtained by Dr. Wallich at Darjeeling, and are labelled 
Balitora anisura. 
The following new genus is named after H.E. Lord Mayo, Governor- 
General of India, as a slight acknowledgment of the assistance I 
have received in my icthyological investigations :— 
Genus Mayoa, g. n. 
Body anteriorly depressed, posteriorly compressed. Snout smooth 
and rounded. Eyes lateral. Mouth small, transverse, situated on the 
inferior surface of the head, and entirely surrounded by a large sucker 
formed by both lips, which are thick, and have a free posterior edge. 
Pharyngeal teeth in three rows, wneinate, 5, 3, 1/1, 3, 5. Pectoral 
and ventral fins horizontal. Dorsal, without an osseous ray, com- 
mences somewhat in advance of the ventrals. Scales of moderate 
size, those near the anal fin not enlarged. Lateral line continuous, 
and passes to the centre of the base of the caudal fin. 
Mayoa MODESTA, sp. 0. 
Be i DP Ufo Ba 15 Ne TAR Sa VC. 197° Tec dbs 
L. tr. 8. 
Length of head nearly 4, of pectoral 2, of base of dorsal 7, of base 
of anal ;4;, of caudal 1 of the total length. Height of head +4;, of 
body 52, of dorsal fin =2;, of ventral 2, of anal } of the total 
length. 
Eyes with free margins; they are very nearly on the superior 
surface of the head, but directed laterally ; diameter ; of length of 
head, 1? diameter from the end of snout, 2 diameters apart. 
Head broad, depressed, and rounded; snout also rounded. No 
pores on the head. Lower surface of head and chest flat. The 
snout overhangs the mouth, which is small, transverse, and uearly 
semilunar in its shape. Mouth with an adhesive sucker formed by 
both lips ; it is extended some distance posterior to the lower jaw, as 
in the genus Gonorrhynchus, from which it essentially differs in that 
the sucker is completed by the upper lip, so it completely surrounds 
the opening of the mouth. The lower lip close to the edge of the 
mouth, the upper lip, and the posterior margin of the sucker are 
all roughened, the last being fimbriated. Four barbels, one rostral 
aud‘one maxillary pair, all being rather thick ; but their length is only 
equal to one-half of the width of the orbit. Guill-opening narrow, 
extending to the base of the pectoral fin ; nostrils approximating, 
divided from one another by a valve. 
Teeth pharyngeal, uncinate, 5, 3, 1/1, 3, 5. 
