Genus Astrape, Mull, and Henle.
Astrape, Mull, and H.
Tail with a fold on each side. Body entirely naked; upper surface reddish-brown, lower surface white and yellowish-white. One dorsal fin only on the tail, without spine. Caudal well developed. Anterior nasal valves confluent into a broad flap overhanging the mouth. Teeth pointed; dental laminæ scarcely extending beyond the other margin
of the jaws. Spiracles immediately behind the eyes, which are very minute, and hardly traceable under the skin. An electric apparatus between the head and pectoral fins.