IIG DR. A. GiJNTHER ON THE GENU3 NANNOPERCA. [Mar. 26, 



behind. Nasal pierced by the nostril. Loreal none. Anterior 

 ocular elono'ate, not touching the sui)raorbital. Two posterior ocu- 

 lars sometimes confluent into one. Seven upper labials, the third 

 and fourth reaching the orbit, the sixth and seventh largest ; two 

 temporals on the side of the occipital, the anterior one touching 

 both posterior oculars. Series of maxillary teeth short, the hinder 

 longest, not grooved. Ground-colour dirty orange; crown blackish. 

 Fro^ the occiput to the tip of the tail a longitudinal jet-black streak 

 with sharply defined edges, forked just behind the occiput into two 

 diverging extremities, which cover the edge of the occipitals ; tips of 

 light-coloured scales black. On the sides of the body some irregular 

 bfack spots, which, on the posterior of the body, form an uninter- 

 rupted narrow line. 



The specimen described was sent to me from Caunavieras, which 

 is to the south of the city of Bahia. It is now in the British Mu- 

 seum. According to information received from Dr. Albert Giinther, 

 this is a new species, belonging to the genus Geophis of Wagler. I 

 propose to name it after him, in acknowledgment of his unremitting 

 kindness in aiding my endeavours to become acquainted with the 

 Brazilian Ophidians. 



Bahia, February 11th, 1861. 



4. On a New Genus or Australian Freshwater Fishes. 

 By Dr. Albert Gunther, For. Memb. Zool. Soc. 



(Plate XIX.) 



Fam. Percid^. 



Group Apogonina. 



Nannoperca. 



Body compressed, oblong, covered with scales of moderate size. 

 Dorsal fins slightly continuous at the base, the first with seven spines. 

 No recumbent spine before the dorsal fin. Three anal spines. 

 Narrow bands of villiform teeth in the jaws, on the vomer and the 

 palatine bones. None of the bones of the head serrated. Branchio- 

 stegals six ; pseudobranchise present. Lateral line none. 



Nannoperca australis. (PI. XIX. fig. 2.) 



B. 6. D. 7 i. A. I-. V. 1/5. L. lat. 30. L. transv. 12. 



This species resembles a young Perch in general appearance, but 

 is more elongate ; the greatest depth of the body is above the 

 root of the ventral fin, and contained four times and five- sevenths in 

 the total length ; the length of the head is contained three times and 

 two-thirds in it. The snout is moderately produced, as long as the 

 orbit, with the cleft of the mouth oblique and rather narrow, the 

 maxillary extending to below the front margin of the orbit. The 

 lower jaw projects beyond the upper. The teeth are viUiform, those 

 of the palatine bones minute and forming only a short series. The 



