Dr\ H. Woodward — Cirri^edesfrom Trimming ham Chalk. 339 



One of these, named by M. Bosquet Mitella lithotry aides, of whicli he 

 describes and figures from the Chalk of Maestricht the five separated 

 plates — viz., the carina, rostrum, sub-rostrum, scutum, and 

 fatus ; the tergum is not represented (see op. cit., pp. 23-27, pi. iii, 

 figs. 5-10) — shows, like Dr. Arthur Rowe's specimen from the 



Fig. 1. Brachylepas {Mitella) IWiotryoides, Bosq., sp. External view of left side 

 of carina, with two or more rows of lateral scales still adherent to its 

 base. Enlarged about twice nat. size. From the Chalk of Maestricht. 

 Fig. 2. Group of adherent latera viewed from the inside. 

 Fig. 3. The same valve as in Fig. 1 viewed dorsally. About nat. size. 

 Fig. 4. Sub-rostnim, showing adherent verticUlate latera. About twice nat. size. 

 (Figs. 1-4 copied from M. Bosquet's memoir on " Cirripedes dans 

 Cretace du Duche de Limbourg," 4to, 1857, Harlem, pp. 23-27, pi. iii, 

 figs. 6a, 5, d, and 9«, c.) 



Norwich Chalk, portions of three rows of small verticillate, imbricated 

 scale-like plates still adhering to the bases of the carina and sub- 

 rostrum, and although not absolutely specifically identical with 

 Dr. Rowe's Brachylepas cretacea, I have no hesitation in referring 

 the Maestricht specimens of M. lithotryoides to the genus Brachylepas.^ 



used in geological works, it has appeared to me to be as useless as hopeless to 

 attempt any change. It may be observed that the genus Pollicipes was originally 

 proposed by Sir John Hill ('History of Animals,' vol. iii, p. 170) in 1752, but as 

 this was before the discovery of the binomial system, by the rules it is absolutely 

 excluded as of any authority. In my opinion, under all these circumstances, it 

 would be mere pedantry to go back to Oken's ' Lehi'buch der Naturgesch.' for the 

 name Mitella, — a work Little known, and displaying entire ignorance regarding the 

 Cirripedia." 



^ I do not find any very close analogy between M. Bosquet's Mitella lithotryoides 

 and the living genus Llthotrya, which is a burrowing Cirripede, lodged in cavities 

 bored in calcareous rocks, shells, or corals, having the lower part of the peduncle 

 quite naked, the upper margin being covered by two rows of square non-imbricate 

 scales, followed by several rows of minute separate stellate plates, each row becoming 

 less and less in size until they disappear almost altogether. In M. lithotryoides the 

 scales are numerous, close set, and imbricated. The valves of the capituJum have 

 a very close agreement with Brachylepas cretacea, H. Woodw., and, as I hope to 

 show, also with B. (Pollicipes) fallax. I propose therefore, if pennissible, to 

 discard the specific name lithotryoides, and would suggest that of B. Bosquetii, in 

 compliment to the author, as less misleading and more appropriate to the species. 



