4A, FOSSIL CIRRIPEDTA. 
very poorly characterised form, and I can point out no important character in the shell 
by which it can be recognised. The rostrum and carina, which are of nearly equal sizes, 
are locked together, and hkewise to the fixed scutum and tergum, by the usual interfold- 
ing plates; the plates between these latter valves seem to have been less developed in. 
M. Bosquet’s specimen than in the English. ‘he fixed scutum has a large adductor plate, 
which seems to have been chipped in M. Bosquet’s specimen; this valve and the fixed 
tergum in all essential respects resemble the same valves in /. Strémia. The surface of 
the shell is very smooth. 
The moveable scutum has its occludent margin considerably arched : the lower articular 
ridge is broader than the upper ridge, in which respect it resembles the same valve in /. Levi- 
gata, a South American form, but the whole valve is not so broad as in that species. There is 
no adductor ridge on the under surface. The moveable tergum has its upper articular 
ridge narrow, and slightly produced into a point on the scutal margin: in this: latter 
respect this species, also, resembles /. /evigata, but differs from it in the whole valve not 
being so broad in proportion to its height. 


