106 PROCEEDINGS OF THE ACADEMi' OF [April, 



drop as misleading the arrangement of species according to the shape 

 of the carina, it appears at once that the structure of the little males 

 is wonderfully correlated with certain features of the hermaphrodites, 

 especially the development of a subcarina. The least specialized males 

 belong to hermaphrodite forms which are known by morphological and 

 palaeontological evidence to be old generalized types. The most 

 modified males are those of the highly evolved hermaphrodite or female 

 forms. A classification fully supported by both sexes surely rests 

 upon a broader base than one ignoring the males. 



Classification of Scalpelliform Barnacles. 



I. Male having six jointed cirri and a mouth, 3 to 6 valves, and a more 



or less distinct peduncle. Female or hermaphrodite alivays 



having a subcarina. Unpaired valves never fewer than 3. 



a. Male with 6 well-developed valves, and distinctly divided into 



capitulum and peduncle. Female or hermaphrodite with 13 



valves (sometimes 14 by addition of a subrostrum, or 15 



when another pair of latera is added). 



b. No plate interposed below the tergum between scutum and 



carina, Genus Calantica Gray. 



b'. An upper lateral plate interposed between scutum and 



carina, Genus Smilium Gray. 



a\ ]\Iale with 3 valves and an oblong capitulum hardly differ- 

 entiated from the peduncle. Female and hermaphrodite 

 with 15 valves, three pairs of lower latera and an upper 



latus, Genus Euscalpellum Hoek. 



II. Male oval or sack-like, without mouth or peduncle, the alimentary 

 system and cirri being vestigeal; plates wanting, or very small 

 scuta and terga may be present. Female or hermaphrodite 

 never having a subcarina. Plates 14, or 13 hy suppression of 

 the rostrum, there being a pair of upper latera ancl three pairs 

 of lower latera. Never more than 2 unpaired plates. 



Genus Scalpellum Leach. 



Genus CALANTICA Gray. 

 Calantica Gray, Annals of Philo-sophy, n. ser., X, 1825, p. 101, for Scal- 

 pellwn villosum Leach. Pilsbry, Bull. 60, U. S. Nat. Mus., 1907, p. S. 



In Calantica there are but three pairs of latera, all basal. All the 

 plates have apical umbones, as in Mitella. There are therefore 13 

 valves, or sometimes 14 by addition of a subrostrum. The comple- 

 mental male has a distinct capitulum with 6 large valves. Type S. 

 villosum Leach (fig. 1, a, b). There are two groups of species. 



Oriental Group — Calantica s. str. 



C. villosa (Leach). East Indies? 



C. trispinosa (Hoek). Sulu Sea, 82-102 fathoms. 



C. eos (Pilsbry). Japan, 71 fathoms. 



