488 Cc. A. NILSSON-CANTELL 






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Fig. 2. Lefas australis weltneri n. vat. 
a pupa with primordial valves (total length 2,15 mm.); 6 pupa just leaving the pupa stage (total 
length 2,8 mm.); ¢ young specimen with calcareous plates developed (total length 3,27 mm.); 
dthe lower part of the scuta in ventral view, showing small umbonal teeth; e, f the same 
teeth from other individuals (total length 12, 20 and 19 mm. respectively): g fullgrown specimen 
(total length 30 mm.); # the lower part of the scuta in ventral view without teeth; 7 carina, 
dorsal view; 7 the fork of the carina seen from beneath. 
