110 
PROFESSORS T. W. BRIDGE AND A. C. HADDON 
connection with the scaphium ; the crescentic process, on the contrary, is directed 
backwards and slightly outwards, and, instead of curving inwards towards the 
complex centrum, remains in a straight line with the anterior process, and rapidly 
tapers to an acutely pointed distal extremity. At the junction of the two processes, 
and on the inner side of the ossicle, a long and slender articular process is given off, 
which also tapers to a point and ultimately fits into a deep pit on the lateral surface 
of the anterior portion of the complex centrum. The crescentic process of each 
tripus occupies the same relative position with regard to the inner portion of the 
degenerate dorsal wall of the corresponding air-sac that it does in each of the lateral 
halves of the anterior chamber of a normal air-bladder, with its inner margin directed 
towards the ligamentous connection of the dorsal lamina with the side of the complex 
centrum. The radial fibres of the tripus appear to be represented by a few scattered 
fibres derived from the dorsal edge of the inner wall of each air-sac and inserted 
into the inner margin of the crescentic process. 
Akysis Kurzii, Day. 
Day (9, pp. 703-4) describes a new species of Akysis from Pegue Yomas under this 
name. The air-bladder is said to be “ small, in the abdominal cavity, not enclosed in 
bone,” but the description is obviously too brief to allow of any comparison with 
A. variegatus. 
Acrochordonichtli ys pleurostigma. 
The only example of this interesting Javan species that we have been able to 
examine was about two inches in length, and, unfortunately, in an even worse state of 
preservation than our solitary specimen of Akysis. So far, however, as we were able 
to determine, Acrochonlonichthys closely resembles Akysis, both in the condition of 
the air-bladder, and in the nature of the modifications which the anterior vertebrae 
and their processes undergo. 
The transverse processes of the fourth vertebra (fig. 28, tp}) are greatly expanded 
and enclose on each side on their ventral surfaces shallow concave recesses, each of 
which is separated from its fellow of the opposite side by the somewhat compressed 
centrum of the com 2 )lex vertebra. The anterior margin of each recess is strongly 
decurved, the posterior and other margins but very slightly so. The free distal 
extremity of the anterior margin is somewhat produced and recurved. The transverse 
process of the fifth vertebra resembles those of the succeeding rib-bearing 
vertebrae, and forms no part of the bony recesses for the air-sacs. The lateral ridge 
of the complex centrum and the corresponding dorsal lamina form a feebly developed 
but continuous ridge extending along the side of the centrum obliquely upwards, 
backwards, and outwards towards the ventral surface of the root of the modified 
transverse jjrocess. We could find no trace of the usual lateral grooves for the 
