Barnacles of the Genus Megalasma. 



371 



obscure ; the basal margin is more or less everted, and there 

 is on the inner surface a small umbonal tooth on each valve ; 

 area defined by line of attachment of peduncle very narrow. 



Ksr. 5. 



Megalasma (Glyptelasma) hamatum, sp. n., holotype. 



A. Lateral view. B. Basal angle of scutum, inner surface. C. Scutum 

 from occludent aspect, to snow eversion of basal margin. D. Carina, 

 inner surface. 



Tergitm with straight margins except the occludent, which 

 may be gently curved, carinal margin one-third to one-half as 

 long as the occludent. Carina narrow, evenly curved, sides 



