OF CONCHOLOGY. 147 



Report of Meeting of the British Association for the Advancement 

 of /Science. London Athenceum, Oct. 6, 1849, j;?. 1018. 



" Section D. Natural History. 



*' Papers presented. ^On the Genera of British Patellae ea, 

 hy Prof E. Forbes.' 



" In the course of the researches undertaken by the author 

 and Mr. Hanley for their joint work on the History of the Brit- 

 ish Mollusca, a fresh inquiry was required to be made into the 

 propriety with which the British Patellacea had been assigned to 

 known genera. It resulted that among our species we had two 

 new forms for which it became necessary to construct new generic 

 types, — viz. : the so-called lothia [misprint for Lottia'] fiilva, 

 and lothia [do.] ancyloides. Neither of these belong to Acmoea, 

 with which lothia [do.] is synonymous, but differs essentially in 

 characters of head, mantle and dentition, — and in the latter case, 

 position of body in relation to the shell. As no established ge- 

 nus can receive them, for the former a new genus, Pilidium, is 

 proposed, * * * and for the latter, a new genus, Propi- 

 iidium.'' 



The words enclosed in brackets are ours. Admitting the 

 validity of a misprint, which is doubtful, the grounds for refer- 

 ring the first species to any other generic name than Pilidium 

 are not apparent ; and especially as Prof. Forbes says " it differs 

 essentially " from the " so-called lothia,'' the reference of it to 

 that generic name afterwards by several authors seems entirely 

 gratuitous.* 



G-en. ch. — Shell patelliform. Apex anterior, generally deep 

 colored. Mantle fringed with cilia. Rhachidian tooth long, 

 rhomboidal, bearing a very large black cusp, with a simple denti- 

 cle on each side. Laterals with broad cusps, striated beneath and 

 obliquely bent. Shafts slender. (Loven.) 



Type. Pilidium fulvum, Forbes. Plate 15, fig. 4, 4a. 



JS'yn, Patella fulva, O.F. Muller, Prod. Zool. Dan. p. 227; 

 Zool. Dan. ph 24, figs. 1, 2, 3. Loven, Ov. K. v. Ak. 

 For. p. 199, pi. 6. 

 Pilidium fulvum, Forbes, Athenaeum, Oct. 6th, 1849, p. 

 1018. Forbes and Hanley, Hist. Brit. Moll. vol. ii, p. 

 441, pi. 62, figs. 6, 1, pi. AA, fig. 3. 

 Patella Forhesii, J. Smith, M. Wern. Soc. vol. viii, p. 107, 

 pi. ii, fig. 3. Brown, 111. Con. Gt. Brit. pi. 57, figs. 

 3,4. 



• See "Woodward's Manual Recent and Fossil Shells, p. ii. 



