526 LEPADIDJE. 



the case. This is the species to which I alluded in the 

 Introduction to my ' Monograph on Fossil Lepadidse.' 

 It is an interesting species, from being the only known 

 Secondary one, but in itself it is a 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 

 by the usual interfolding plates, and likewise to the fixed 

 scutum and tergum; but these latter plates seem to have been 

 less developed in M. Bosquet's specimen than in the English. 

 The 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 V. Stromia. The surface of the shell is very 

 smooth. 



The moveable scutum has its occludent margin consider- 

 ably arched : the lower articular ridge is broader than the 

 upper ridge, in which respects it resembles the same valve 

 in V. laevigata, but the whole valve is not so broad as in 

 that species. There is no adductor ridge on the under sur- 

 face. 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 

 V. laevigata, but the whole valve is not so broad in pro- 

 portion to its height. 



3. Family Lepadim:. 



Cirripedia having a flexible peduncle, provided with 

 'muscles: scuta and terga, when present, not furnished with 

 depressor muscles : other valves, ivhen present, not united 

 into an immoveable ring. 



This Family has been fully treated of in my former 

 volume, published by the Ray Society,*" and I should here 



excellent, memoir, containing descriptions, with the most oeauntuj 



of several new Cretacean species of Pollicipcs and Scalpcllum. 



Hie memoir is entitled a 'Monographic des Crustaces Fossilea du Terrain 



|^1 UUUWUVl fin V.V^I^ilCUU II 



illustrations, of several 

 The memoir is entitled 

 Cretacee, du D. de Limbourg 



