492 F. JR. Con-per Reed — Fossils from Haverfordicest. 



America, and in the seas of China, Japan, and Molucca ; and they 

 have already been met with fossil in the Jurassic, Cretaceous, and 

 Tertiary strata. 



EiGS. 1-5. — Youugest larval or ' Protaspis' stage of some Trilobites (after Beecher'), 

 for comjDarison with Cyclus. 



Fig. 1. — Sao hirsiita, Barraude. Cambrian: Skrey, Bohemia. 

 ,, 2. — Fti/choparia Ivwffii, 'Meek. Cambrian: North America. 

 ,, 3. — FroetKS 2}arvi>isci/li(s, Hall. Ordovician: New York, U.S. 

 ,, 4. — Dalmanites socialis, Ban: Ordovician: Bohemia. 

 ,, 5. — OleneUiis asaphoides, Emmons, sp. Lower Cambrian {OJenellus zone). 



IV. — Sedgwick Museum Notes. 

 New Fossils from the Haverfordwest District. 



V. 



By F. R. Cow-PER Reed, M.A., F.G.S. 



(PLATE XXIV.) 



LAMELLIBllANCHIATA. 



A FEW species of Lamellibranchs were recorded by Messrs. Marr 

 and Roberts - from the Trinucleiis seticornis Beds of Haverford- 

 west ; and though some new species may now be added to their 

 number with the aid of the numerous specimens collected by 

 Mr. V. M. Turnbull, yet a complete list of the species is at present 

 impossible owing partly to the imperfect condition of many of the 

 fossils and partly to the unsatisfactory state of our knowledge of this 

 class as develoi^ed in British Ordovician rocks. 



The Slade and Eedhill Beds have yielded the majority of the 

 species, and the following may be enumerated : — 



Eedhill Beds. 

 Ctenodonta obliqua, Portl. (?). 



,, transveo-sa,Voxi\.{?), 



,, varicosa, Salt. (?). 



,, sladensis, sp. nov. (var.). 



,, subscittila, sp. nov. 



,, two sp. iudet. 

 Area {Palcearca) , sp. iudet. 

 C'yrtodonta (?) cancellata, sp. nov. 



Slade Beds. 

 Orthodexma seniiradiata, sp. nov.' 

 Ctenodonta rnigiial'ts, Phill. (?). 



,, sladensis, sp. nov. 



,, transversa, Portl. (?). 



,, two sp. indet. 



1 Figs. 1-4, from Zittel's Textbook of Palaeontology, translated and edited by 

 C. R. Eastman (London, 1900 ; 8vo), p. 618. Fig. 5 fi'om C. D. Walcott's Lower 

 Cambrian Fauna, pi. Ixxxviii, fig. 1. 



- Marr & Roberts: Quart. Journ. Geol. Soc, vol. xli (1885), pp. 476-490. 



