EXPLANATION OF PLATE II. 



Radular teeth of Siamese species of Pachylabra all x 75. 



Fig. 1. Pachylabra pesmei (MorLet). 



Fig. 2. Pachylabra conica (Gray). 



Fig. 3. Pachylabra begini (Morlet). 



Fig. 4. Pachylabra turbinis var. subampidlacea, (Ne villi 



Fig. 5. Pachylabra angelica, sp. no v. 



Fig. 6. Living animal of P. angelica as seen from below, 

 e = eye ; e' = eye -stalk ; i — foot ; m = mouth ; o 

 operculum ; t. = tentacle ; t' = oral process ; s. 

 siphon ; 



JOURN. NAT. HIST. SOC. SUM, VOL. IV. 



