re 
233 
Branchiostegals 7. Light brownish, fins with a black margin. 
Length of single specimen known 240 mm. [Type in the 
British Museum examined]. 
Habitat: Arafura sea. 
4. Oloplotosus M. Weber. 
(Max Weber. Nova-Guinea IX. Livr. IV. 1913, p. 521). 
Elongate, tail tapering, head depressed, covered by thick 
skin. Mouth transverse, rounded in front, upperlip very pro- 
minent, anteriorly perforated by the anterior nostrils, which 
form short, rounded tubes. Lips thick, with lamellated folds, 
posterior nostril, in front of which a nasal barbel forms a slit, 
situated much nearer to lip than to eye. Maxillary barbels near 
the end of the upperlip, the mandibulary barbels below the 
corner of the mouth, two mental ones between the intermaxil- 
lary ones. Eye covered by skin. First dorsal short, a little behind 
origin of pectorals, with few rays and a strong spine, denti- 
culated at both edges. Second dorsal beginning before origin 
of ventrals, it is many-rayed, similar to anal and both are 
confluent with the caudal. Ventrals with 12—13 rays. Pectorals 
with a denticulated spine. Conical teeth in about two rows in 
a narrow crescentic band on mandibels and vomer. No maxil- 
lary teeth. Lateral line indistinct. 17 gillrakers on the total 
first branchial arch. Similar ones on the 224 arch, none on the 
following arches. Gillmembranes mesially united with isthmus 
in their whole length; 10 branchiostegals. A conspicuous den- 
dretic organ between anus and anal. 
Fig. 93. Oloplotosus mariae M. Web. 
1. Oloplotosus mariae M. Web. 
Oloplotosus mariae Max Weber, Nova Guinea IX, Livr. IV. 1913, p. 522. 
beutas 1) Disa = 2. 1D). circa 80—o90; A: circa 60—70; 
if 
peer = Ve 2S). Gs circa: 12. 
Height 71/,—71/,, head about 51/,, eye in first half of head 
