534 iiEPOET— 1882. 



3. Report on the Earthquahe Phenomena of Japan. — See Reports, p. 205. 



4. Report on the Conditions under which ordmari/ Sedimentary Materials 

 may be converted into Metamorphic Roclis. — See Reports, p. 239. 



5. On some Fossils of the Inferior Oolite. By the Rev. G. F. Whid- 

 BORNE, M.A., and Professor W. J. Sollas, 3LA., F.G.S. 



Part I. — Lamellibranchiafa. By the Rev. G. F. "Whidbokne. 



The following shells occur in Britain. Ostrea spharoidalis, a large hemispherical 

 form from Yeovil Junction; O. w?M?(/a, flat and pear-shaped, from the Cotswolds ; 

 O. e.vplanata (Goldf.) and O. knorri{7Af.t.^ ; Gryph<en ahrupta, Dundry, which mimics 

 Triijonia costata ; G. cyynvides, Brodvvinsor, elongate with striated umbo, and E. 

 <//o6?<Za, a miniature of -B. colamha; Pectenfenestralis, Dundry, unlike P. retiferus hy 

 having its tesserje square, and P. cornutus (Qu.) ; Plicatida Tcncneyi, Dundry, like PL 

 reticulata, but trigonal, and PI. Buclanani, Yeovil Junction ; Lima (I'pyhvliis, Brod- 

 winsor, like, but with more distant ribs than, L. Henvieri (St.) ; L. amnifera, 

 unlike L. aciculata (Gf.) by having a smaller anterior ear, and L. alticosta ; Cucul- 

 Iffa 2}erlo))(/a, like A. lata (K. and D.), but smooth, and Nucula nucleus (Des\.) ; 

 Mytilus striatissimus, Dundry, more ungulated than M. pectinatus (Sow.); Myoconcha 

 ■unguis, Dundry, large, massive, and with sharp curved anterior, and M. implana, 

 Dundry, a wide trigonal shell, with a straight hinge line almost as wide as itself ; 

 Cardita oralis (Qu.), and Moreana (Bav.), Thracia Studeri (Ag. ); I'erehratula 

 Duvidsonella, small hemispherical with minute ribs, and T. discidus (Waagen). 



Part II. — Sponfjidce. By Professor Sollas. 



The inferior oolite has not hitherto furnished any species of sponge to palaeon- 

 tologists in this country or abroad, we are tlierefore much indebted to my friend 

 the Hev, G-. F. Whidborne for the somewliat large collection of fissil sponges (four- 

 teen species belonging to ten genera), which he has brought to light from tliis 

 formation, and which he has placed in ray hands for description. 



Of Dictyonine Hexactinellidre we have (ci) belonging to the Euretidfe, (1 ) the 

 new genus and species EmjJloca ovata, a very similar form to Porocypellia among the 

 Staurodermata, but generically distinguished from it by the simple Euretid cha- 

 racter of the skeletal nodes, and still further separated by the absence of a continuous 

 dermal skeleton. In outward appearance, and in the characters of its canal system, 

 it moat nearly approaches Scyphia radiata ovalis, Quenstedt, which is found in the 

 White Jura S. (2) Mastodictyum IVhidborni (n. g. and sp.), a thin foliaceons 

 plate which buds oft' on the upper surface small mammillary processes, each of 

 ■which is occupied axially by a cylindrical escurrent canal terminating in a sharply 

 margined apical oscule. (3) Leptophrayma frayilis (n. sp.) very similar to T. 

 foliata, Quenst. {h) Belonging to the Meandrospongise, according to ' Zittel's 

 classification, but naturally more closely connected with the preceding species, we 

 have the new genus Plectospyris, with its two new species, P. eleyans and P. major. 

 This genus approaches most nearly to Plocoscyphia, but is distinguished from it by 

 the simple imperforate character of its nodes, (c) Allied to the Ventriculid<e, "Vie 

 have Calathiscus variolaius {n. g. etsp.). This genus differs from typical ventricu- 

 lites in having the nodes irregularly, not octahedrally, complicated, resembling 

 in this respect Dactylocaly.v more than Myliusia. 



Of Lithistida, we have the Rhizomorine form Platychoni tenuis. Of Catagmidoe 



