SCALPELLUM 



235 



Inframedian latus triangular and about as wide as high. It is very characteristic that, 

 in this new species, the upper part of the plate in the fully grown female projects freely 

 (Fig. 3, c, e). 



Carinal latus triangular, with the umbo at the projecting apex, situated very high. 

 A median ridge extends from the apex. 



Fig. 4. ScalpeUiim Uberum. a. Palpus, b. Mandible, c. Maxilla I. d. Maxilla II. e. Cirrus VI 

 and caudal appendage. /. Complemental male, holotype (total length 0-85 mm.). 



Peduncle well developed, of about the same length as the capitulum. A prominent 

 feature is the great development of the scales which very regularly cover the whole 

 surface. They are triangular in shape, rather like the rostral latus and the rostrum, but 

 smaller. In no other species of Scalpellum have I seen such strongly developed scales. 

 Probably this is a primitive feature if we maintain the old Darwinian opinion, for which 

 T. H. Withers has recently (1928) produced palaeontological evidence, that Pollicipes 

 and Scalpellum with many plates represent ancient forms. Pollicipes mitella (Linne, 1767) 

 has a peduncle closely covered by large scales, which are nevertheless different from those 

 of S. liberum. 



