350 Fretp Museum or Narturat History — Zoérocy, Vor. X. 
gg. Head compressed; eyes lateral; head (with the exception of 
snout) and chest scaly. Hemieleotris gen. nov., p. 364. 
aa. Ventral fins united, forming a sucking disc. 
h. Teeth in the jaws in narrow bands; ventral disc longer than wide, 
free from abdomen; shoulder girdle with 2 or more dermal flaps 
projecting into gill-cavity. Awaous, p. 365. 
hh. Teeth in upper jaw in a single, close-set series, slender, tricuspid, 
bicuspid or simple, curved inward; lower jaw with 2 series of 
teeth, the outer series nearly horizontal, partly or completely 
hidden in the gums, second series erect, pointed; ventral disc 
circular, more or less adnate to abdomen; no dermal flaps on 
shoulder girdle. Sicydium, p. 369. 
49. Genus Philypnus Cuvier & Valenciennes. 
Philypnus Cuvier & Valenciennes, Hist. Nat. Poiss., XII, 1837, 255 
(type Gobiomorus dormitor Lacépéde). 
Lembus Ginther, Cat. Fish. Brit. Mus., I, 1859, 505 (type Lembus 
maculatus Ginther). 
Body elongate, anteriorly subcylindrical, posteriorly compressed; 
head more or less depressed above; mouth large; lower jaw projecting; 
teeth small, in bands on jaws and on vomer; gill-opening large, extending 
forward to under eye; scales rather small, ctenoid, covering body and 
most of head; dorsal fins 2, well separated, with VI-I, 9 rays; caudal fin 
rounded; anal fin with I, 9 or I, 10 rays. 
This genus consists of but two species, both of which usually inhabit 
lowland streams. 
KEY TO THE SPECIES. 
a. Scales small, 61 to 64 in lateral series from upper angle of gill- 
opening to base of caudal; anal rays I, 9; vertical fins with rather 
large black spots, forming cross-bars. dormitor, p. 350. 
aa. Scales larger, 56 to 59 in lateral series; anal rays I, 10; vertical 
fins with small and less distinct blackish spots. 
maculatus, p. 352. 
80. Philypnus dormitor (Lacépéde). 
Gobiomorus dormitor Lacépéde, Hist. Nat. Poiss., II, 1798, 599 (Mar- 
tinique, from a drawing by Plumier); Jordan & Eigenmann, Proc. 
U.S. Nat. Mus., IX, 1886, 482. 
Platycephalus dormitator Bloch, Syst. Ichthyol., 1801, Pl. 60, t. 12 (Mar- 
tinique). 
Eleotris dormitatrix Cuvier, Régne Animal., Ed. 2, II, 1829, 246; Ganther, 
Cat. Fish. Brit. Mus., III, 1861, 119. 
