A78 MARINE BIOLOGY OF THE SUDANESE RED SEA. 
TRYGONID. 
5. TRYGON UARNAK (Forsk.). 
6. TRYGON SEPHEN (Jorsk.). 
MYLIOBATID A. 
7. A®TOBATIS NARINARI (Huphr.). 
CLUPEID. 
8. CLUPEA MOLUCCENSIS (Bleek.). 
9, ENGRAULIS BOELAMA (forsk.). 
PLOTOSID &. 
10. PLorosus ANGUILLARIS (Bloch). 
MURAINID A. 
11. GyMNoOTHORAX HEPATICA ([itipp.). 
NEENCHELIDA, fam. nov. 
Dorsal and anal fins continuous with the reduced caudal; pectorals 
present. Body naked ; vent remote from head. Mouth with lateral cleft 
extending a short distance behind eye ; maxillary articulated with ethmoid 
at a considerable distance behind end of snout, which is not much produced ; 
teeth subconical, pointed, uniserial, well developed in jaws and on vomer. 
Nostrils lateral. Gill-openings separated. Pharyngeal openings of branchial 
clefts restricted. Pharyngeals oblong or ovate, covered with small teeth. 
Frontals ankylosed to form a single bone. Suspensorium vertical. Palato- 
pterygoid an elongated lamina. Caudal vertebrae without lateral transverse 
processes. 
This family seems to be closely allied to the Mureenesocide as defined by 
Regan (“Classification of Order Apodes,” Ann. Mag. Nat. Hist. (8) vol. x. 
1912), but differs in the small pharyngeal openings of the branchial clefts. 
The latter character suggests affinity with the Mureenide, which differ 
notably in the structure of the pharyngeals, the paired frontals, and the 
vestigial palato-pterygoids. The lateral line also differs from that of the 
Murenide, consisting of long exposed tubules as in the Congridz and 
Murenesocidee, : 
