Dr. Henry Woodward — On a new Loricula. 493 



of the peduncle to the shells of Ammonites. This was also the 

 case with all the examples of Loricula discovered and described by 

 Dr. Fritsch from the Chalk of Bohemia (see ante). 



Specimens of the still earlier PolUcipes concinnus, J. Morris (Annals 

 N.H., 1845), from the Oxford Clay were also found in a group attached 

 to the shell of an Ammonite, Amm. {Cosmoceras) Elizahethce, from 

 that formation, but in P. concinnus the peduncle was free and movable, 

 not attached by one side to the Ammonite shell, only fixed by its base. 



Fig. 1. The most perfect of the three specimens attached to the 

 newly discovered Ammonite {^Pachydiscus peramplus) from Cuxton, 

 near Rochester, measures 45 mm. in length and 25 mm. in extreme 

 breadth (the breadth being greatest across the peduncle at about the 

 ninth row of scales, below the capitulum). Measured obliquely along 

 the base of the capitulum where it unites with the peduncle, it is 

 only 20 mm. in breadth, the height of the capitulum being 15 mm. and 

 the length of the peduncle 30 mm. 



Fig. 1. — Loricula Barivini, H. "Woodw., sp. nov., one of three specimens found 

 attached to an Ammonite from the Middle Chalk, Cuxton, near Rochester, 

 Kent, now in the British Museum, Geological Department. Drawn twice 

 natural size. [Registered No. I. 9130.] 



The Capitulum. — In an ordinary pedunculated Cirripede this would 

 consist of 10 valves (4 being paired lateral valves and 2 marginal 

 single ones), namely, 2 terga, 2 scuta, 2 carinal latera, 2 middle or 

 upper latera, and, lastly, a carina and a rostrum. 



In the original specimen of Loricula figured and described by Darwin, 

 only 3 valves are preserved, namely, a scutum, a carinal latus, and 

 a middle or upper latus; he assumes, however, that a tergum, a carina, 

 and a rostrum must have been present when it was perfect, and that 

 in order to complete the specimen a corresponding set of paired valves 

 originally existed on the lower side of the capitulum. 



