224 



dorsal before or above origin of ventrals. Only anterior 



portion of gillrnembranes confluent with isthmus . . Paraplotosiis p. 224. 

 2. Anterior nostril in the frontborder of the upperlip, 

 looking upward or forward. 



a. Gillrnembranes free from isthmus. Origin of second 



dorsal behind ventrals Plotostts p. 226. 



b. Gillrnembranes united to the isthmus. Origin of 

 second dorsal before or above origin of ventrals. 

 . Conical teeth in the jaws, besides molarlike 



in mandible and on vomer Cnidoglanis p. 231. 



/3. No maxillary and no molarlike teeth Oloplotostis p. 232. 



II. No praeanal dendritic organ. 



1. Interior border of upperlip perforated by the anterior 

 nostril, which looks downward. Dorsal spine without 



serrature Porochilus p. 234. 



2. Anterior tubular nostril in the frontborder of the 

 upperlip, looking forward. Dorsal spine serrated 



behind Copidoglanis p. 235. 



I. Paraplotosus (Bleeker) de Beaufort. 



(BLEEKER, Atl. Ichth. II. 1862, p. 100. (nomen solum)). 

 (DE BEAUFORT. Bijdr. Dierk. Afl. 19. Amsterdam 1913, p. 97). 



Elongate, tail tapering, head depressed, mouth transverse, 

 rounded in front. Lips thick with papillae and vermiculated 

 folds. Upperlip very prominent, perforated at its border near 



Fig. 88. Paraplotosus albi- 

 labris (C.V.). View of mouth 

 and lips from below, n nostril, 

 t teeth, nid mandibulary, m 

 mental barbels. 



Fig. 89. Inner view of second branchial arch 

 of Paraplotosus albilabris (C. V.). 



the mouthopening by the anterior nostrils which look down- 

 wards and are surmounted anteriorly by a very prominent 

 caniculated lip. Posterior nostril a slit between eye and upperlip 



