112 REV. O. P. CAMBRIDGE ON SOME NEW ["Jail. 21, 



serrated internally ; adipose dorsal commences not far from the 

 extremity of the first dorsal, and its hase is a little longer than that 

 of the anal ; caudal forked, the lobes of nearly equal lengths. 

 Colours : a dark spot on the shoulder, and a second on the base of 

 the adipose dorsal fin ; body with indistinct cross bands. 



Hab. Tenasserim provinces. 



One specimen (Blyth's typical one), 3^ inches in length, is in the 

 Calcutta Museum. 



Macrones leucophasis. 



Bagrus leucophasis, Blyth, J. A. S. of Beng. 1860, p. 148. 



D. f|0. P.^. V.6. A. j. C. 17. 



Length of head f , of pectoral \, of caudal -f-, height of body |> 

 of dorsal fin | of the total length. Eyes, diameter | of length of 

 head, 1| diameter from end of snout, and 1 apart. Head somewhat 

 compressed, snout rounded, the upper jaw slightly the longer. The 

 snperior longitudinal groove on the upper surface of the head does 

 not quite reach the base of the occipital process, which last is twice 

 as long as wide at its base, while there is a short interspace between 

 its termination and the basal bone of the dorsal fin. Upper surface 

 of the head slightly rugose. Barbels : the nasal reach the anterior 

 margin of the orbit, the maxillary the end of the anal fin, the external 

 mandibular to the middle of the pectoral, and the internal to the gill- 

 opening. Teeth in an uninterrupted crescentic band on the palate. 

 Fins : dorsal spine moderately strong, as long as the head from the 

 angle of the mouth, finely serrated posteriorly in its upper fourth ; 

 the adipose fin commences just behind the first dorsal, and the length 

 of its base is nearly double that of the rayed fin ; pectoral spine much 

 stronger than the dorsal, of about equal length, whilst it is coarsely 

 serrated internally. The ventral arises behind the posterior extremity 

 of the dorsal ; caudal deeply forked, the lobes having filamentous 

 prolongations. Colours : of a deep purplish black over the body and 

 fins ; numerous white dots exist on the body, most apparent after death. 



Hab. Burmese rivers, attaining 12 inches or more in length. Its 

 native name signifies " topsy turvy," as it is said to swim with its 

 abdomen uppermost. 



Tn the definition of the genus Bregmaceros, Thompson, the pre- 

 sence of an air-vessel and pyloric appendages has been denied ; the 

 former is, on the contrary, comparatively very large (in B. atripinnis, 

 Day), whilst it has two pyloric appendages. 



5. On some new Genera and. Species of Araneidea. By the 

 Eev. O. P. Cambridge, M.A., C.M.Z.S. 



[Keceived December 2, 1872.] 



(Plates XII.-XIV.) 



The curious and minute Spiders described in the present paper 

 are a strong disproof of an idea, very common among collectors, that 



