271 
This character, which has even been uncritically inserted among 
the generic features, cannot serve as specifically distinguishing 
criterion, because of the contractions and extensions of the ped- 
uncle, easily observed in living barnacles. I also present a draw- 
ing of the internal aspects of carina and scutum to show the dif¬ 
ferences from the following species. 
Fig. 29. 
Figs. 29 and 30. Megalasma striatum, S. W. of Tueuran. 
Fig. 29. a adull specimen in side view, b internal aspect of the carina, c of the left 
scutum. [X 5,3]. — Fig. 30.. a pupa just attached, b pupa with primordial valves de- 
veloped, c young specimen showing the transformation of the basal part of the scutum 
by calcification. [X 22]. 
An interesting feature of the animal seems to have escaped 
the attention of previous investigators. One pair of dorsal fila¬ 
mentarv appendages are placed close together, almost in the 
dorsal line of the animal above the first pair of cirri; their length 
is about one third of cirrus I. 
Specimens of all stages from the pupa stage onwards were found 
on the Cidaris- spines. The pupa (Fig. 30 a) is large, mueh larger 
than the pupas of the Scalpellidae, and corresponds in size 
with the Lepas- pupa. Whether this is a constant feature disting¬ 
uishing the families, future investigations must disclose. — The 
pupa is siender, with a shallow, dorsal exeavation corresponding to 
the furrow of the body between the larval regions which later on 
constitute the capitulum and peduncle. The ventral (occludent) 
