340 Dr. H. Woodward — Cirripedes/roni Trimminyham Chalk. 



As nearly all the Lepadidse occurring in a fossil state are met 

 ■with as detached valves, it will be found convenient to give here 

 a figure of Scalpellum (after Darwin) in which the valves forming 

 the capitulum are all named, and their relative position to one 

 another when united is admirably shown (Fig. A). 



The other figure given is that of the recent Pollicipes mitella. 

 Darwin says of Pollicipes,^ " this is the most ancient genus of the 

 Lepadidae and seems also to be the base of the genealogical tree ; for 

 Pollicipes leads, with hardly a break, by some of its species into 

 Scalpellnm villosum, and Scalpellum leads by Oxynaspis into Lepas 

 and the allied genera; Pollicipes mitella is nearer allied to the 

 Sessile Cirripedcs than is any other pedunculated Cirripede, except 

 perhaps Litholrya, which is also closely connected with Pollicipes" 



Cai'itvlum. 



CAriTULUM. 



SUB-nOSIKUIL 



sr. 



Peduxcle. Pedincle. 



Fio. A. — Scalpel! ion fossnia, from the FiG. B. — Pollicipes mitella, Liun.,^ a living 

 Norwich Chalk (after Darwin). Philippine species (after Darwin). 



Tiirrilepas and Brachylepas were of course unknown until a much 

 later date. Pollicipes mitella certainly enables one to understand 

 the structure of Brachjlepas better than any other Cirripede with 

 which I am acquainted.] 



2. Beachylepas (Pollicipes) fallax, Darwin, sp., 1851. 

 (Figs. 5-24.) 



Pollicipes fallax, Darwin, Men. Foss. Lepadiche : Pal. Soc, vol. v (1851), pp. T/), 



76, tab. iv, figs. %a, h, 4to. 

 Mitella fallax, Bosquet, 1857: " Cirripedes dans le Terrain Cretuce du Duche de 



Linihourg," 4to, Ilarlinn, pp. 17-28, pi. ii, figs. 1-12 ; pi. iii, tigs, I, 2. 



This species is well represented from the Chalk Blutts of 

 Trimmingham, Norfolk, and was first described by Charles Darwin 

 in 1851 {supra). Darwin only figured a scutum [^a) and a tergum 

 (86), twice natural size. These were from the Upper Chalk of 

 Norwich (Fitch Coll.), still preserved and identified by Mr. F. Leney 



* Darwin, Fossil Lepadid;o : Pal. S<k\ Mon., 18.51, p. 48. 



^ The letters attached to the valves in Pollicipes mitella (Fig. B) correspond to the 

 names on the valves in Scalpellum (Fig. A) placed beside it. 



