PSEUDOICHTHYAS. 61 
1. RHINATREMA BIVITTATUM. 
Rhinatrema bivittatum Dum. & Bib. H. G. viii. 288. 
Cecilia bivittata Cuv. R. A. ii. 100.; Guérin, Icon. t. 25. f. 2. 
Gray in Griff. A. K. ix. 284. 
Hab. Cayenne. Mus. Paris. 
B. Smrenus. — Nostrils not enclosed in a bony case; the internal one 
in front, between the lips and the bones of the palate. Maxil- 
lary bones none, or rudimentary. Palate and lower jaw toothed. 
Cuvier (Oss. Fos. v. 240.) observes that the internal nostril is 
the character which best separates these animals from fish. See 
also Owen (Linn. Trans. xviii. 327.). 
Orper IV. PSEUDOICHTHYAS. 
Body elongate, fish-like ; covered with imbricated oval scales ; and 
with dorsal and caudal membranes resembling fins, strengthened 
with soft jointed rays. 
_ Legs four, rudimentary, elongated, subulate. 
‘Gill external, under side tufted ; internal, on the edge of some of 
the septa between the gill openings. Melville. 
External nostrils not enclosed in a bony case; the internal ones 
between the lips and the bones of the palate. 
Mazille none. Intermaxille very small, with one or two teeth. 
Palatine teeth very large. Lower jaw with large teeth. t. 4. f.20. 
Heart with two auricles. 
Lungs equal. 
_ Trachea, on ventral face of digestive tube. 
_ Amph. diplopneumena fimbribranchia Hogg, Ann.and Mag. N. H. 
_-:1841, 362. 
_ Pisces (part.) Owen, Trans. Linn. Soc. xviii. 1839, Ann. and Mag. 
— N. Fi. 265., Ann. Sci. Nat. x. 371.; Bonap. Pisces Europ. 
_ Amphibia (part.) Bichoff, Mem. Leipzig, 4to, 1840, and in Ann. 
Set. Nat. 1840; Jones, Outlines of Animal King. 538.; M. Ed- 
wards, Ann. Sci. Nat. 1840, 159., and in Ann. and Mag. N. H. 
1841, 468.; Schlegel, Faun. Japon. 121. 
_ Ichthyo-Batraciens Duvernoy, Rev. Zool. 1849, 188. 
