12 
NEW OR LITTLE KNOWN FISHES 
Of this difficulty Perugia records his own experience when endea- 
vouring to enumerate the much more conspicuous anal rays of 
Lambertia ; it is possible, therefore, that he has failed to detect 
some of the shorter and more delicate rays. # 
NEOSILUKXTS MjSDIOBAHBIS sp. nov. 
NAEEOW-FEQNTED TANDAN. 
1 D. i 6. 2 D. + C. + A. 118. 
Skin covered with a network of fine anastomosing tubules. 
Lateral line with a series of enlarged tubular papilla?. Depth of 
body 5, length of head 4| in the total length. Head with small, 
crowded, wart-like papillae intermixed with larger ones, its width 
If in its length, which is If in the trunk. Diameter of eye rather 
less than 6 in the length of the head and 2-g- in that of the snout, 
which is broadly rounded and a little narrower than long. Inter- 
orbital region convex, its width subequal to that of the mouth and 
2f in the length of the head. Each group of premaxillary teeth 
nearly twice as wide as long at the symphysis ; vomerine group sub- 
ovate, l-o- time as wide as long mesially ; mandibular groups sub- 
triangular, each 1\ time as wide as long, with the outer extremity 
forming an obtuse point ; tips of teeth not or but little discolored. 
Barbels moderate, the nasal reaching to beyond the middle of the 
eye, its length 2 in that of the head ; maxillary barbel reaching to 
the posterior border of the eye ; postmental barbel extending hori- 
zontally backwards far beyond the gill-opening, 1^ in the length of 
the head; mental barbel longer than the maxillary. Predorsal 
length 3i| in the total length ; dorsal spine straight, smooth in front, 
serrated behind, the teeth directed upwards, t its length If in that 
of the head ; longest soft ray as- high as the body below it ; second 
dorsal fin with 26 rays, equaling the head in length. Caudal fin 
with 10 rays, 6f in the total length. Anal fin with 82 rays, its 
distance from the tip of the mandible, 2-f in the same. Pectoral 
fin with i 10 rays, the spine straight, smooth in front, strongly 
serrated behind, a little longer than the dorsal spine ; the appressed 
rays reach backwards to the ventral fin. Ventral pointed, with 13 
rays, its length 2 in that of the head. Grill-rakers 8 + 21, the 
* Another solution of the difficulty presented by the abnormally large number 
of pectoral rays in Lambertia and the similarly small number of ventral rays in 
Anyperisiius occurs to one's mind, but hardly seems plausible enough ; it is that by 
some unfortunate mischance the numbers were confused by their describer, and the 
fin formulas of the two genera should read respectively P. 9, V. 13 and P. 9, V. 14 
instead of P. 14, V. 13 and P. 9, V. 0. This would bring them into, conformity with 
the other fluviatile genera of the Tandanus type. 
f This character is so peculiar that I can hardly believe in its constancy. 
