222 SUB-CLASS (AND ORDER) TELEOSTEI. 



Olanidium, Centromochlus, Trachehjopterus. Cetopsis, Astroplv/siis ; Sijno- 

 dontis C. and V., trop. Afr. 



Callomystax Giinth., Bengal, Mochocus Joannis. Rhinorilanis Giinth., 

 Upper Nile. 



Malapterurus Lac, electric cat-fish, trop. Afr., electric organ extends 

 over whole body beneath the skin.* 



Stygogenes, Arges, Brontes and Astroplehus in the lakes and torrents 

 of the Andes, Hmnboldt thought they lived in subterranean waters 

 and were ejected by volcanoes; Callichthys, similar in dist. and habits 

 to Doras (p. 221) ; Chaetostomus with the allied Plecostomus, Liposarcus, 

 Pterygoplichthys ; Rhinelepis, Acanthicus, Xenomystus, from f. w. of S. 

 Amer. ; Hypoptopoma ; Loricaria L., trop. Amer., Acestra Kn., Brazil, 

 Surinam; Sisor, N. India; Erethistes M. and T., Assam; Pseudecheneis 

 Blyth, Himalayas ; Exostoma Blyth, E. Ind. continent. 



Aspredo L., Guiana, the female attaches the eggs to the spongy integu- 

 ment of its belly by pressing against them ; Bunocephalus, Bunocephal- 

 ichthys and Harttia from trop. Amer. 



Heptapterus, Nematogenys, Trichomycterus, Eremophilus, Pariodon 

 are small S. American forms from f. w. of high altitudes to 14,000 ft.; 

 they resemble the loaches of the N. Hemisphere in appearance and 

 habits. 



Stegophilus Rein., and Vandellia C. and B., small fishes from Brazil, 

 the latter are said to ascend urethra of persons bathing, but there is no 

 doubt that they enter the gill-cavity of larger fishes. 



Cathorops Jordan and Gilbert, Panama ; Ictalurus Raf., f. w. of X. Amer. 



Sub-order 3. SYMBRANCHII. 



Body eel-snaped. Shoulder-girdle usually joined to the skull ; 

 no mesocoracoid. Scales minute or absent. No paired fins. 

 Unpaired fins reduced. Anus far from head. No air-bladder ; 

 gill-openings confluent in a single slit. Stomach without cae- 

 cum and pyloric caeca. Ovaries with oviducts. Widely dis- 

 tributed in warm seas and freshwaters. 



Fam. 20. Symbranchidae. Eel-like, without paired fins, scales 

 minute or absent ; gill-openings confluent into one slit on the ventral 

 surface ; anus far from head ; no air-bladder, stomach caecmxi or pyloric 

 caeca ; with ovidvicts ; f. w. and bracldsh w. of trop. Amer. ; 3 genera, 

 and one marine genus (Chilobranchus) from Australia. Amphipnous Miill, 

 Bengal, 3 branchial arches of which the second alone possesses gills, and 

 narrow slits, with a king-like branchial sac on each side opening between 

 hyoid and first branchial arches and supphed by branchial arteries ; A. 

 cuchia ; Monopterus Lacep., 3 branch, arches and small gills, no branch, 

 sac, East Ind. Arch, and Cont. ; Symbranchus Bl., 4 branch, arches and 

 large gills, trop. Amer. and E. Ind. 



' * Ballowitz, Das elect. Organ des afrikanischen Zitterwelses^ Jena 

 1899. 



