172 Geological Society. 



JUiabou Marls of the Sfcaffordiaa Series are as barren in plant- 

 remains as the corresponding Etruria Marls. A list is also given 

 I'rom red and purple shales in CumbiMland, which contain Upper 

 Coal-Measure plants. Part of the Ardwick Series of Manchester 

 l)elongs to the Staffordian Series. A table of all plants known from 

 the two upper Series (3 Sc 4) is next given, the distribution of 

 species in the four subdivisions is analysed, and the differences 

 between the two Series are discussed. Finally, a list of plants from 

 the Bradford Colliery, Manchester, from shales extending from 8 to 

 107 yards above the 'Bradford Four-Foot Coal,' is appended, and 

 the iods are i)laced in the Staffordian Series ; while the species 

 from shale immediately below this coal, and from shale 88 yards 

 lower down, are classed with the Westphaliau Series. 



November 22nd, 1905.— J. E. Marr, Sc.D., F.R.S., 

 President, in the Chair. 



Tlie following communication was read : — 



' On a Xew Specimen of the Chimoeroid Fish, Myriacanthus 

 jiarado.rus, Ag., from tbe Lower Lias of Lyme Regis (Dorset).' By 

 Arthur Smith Woodward, LL.D., F.E.S., F.L.S., F.G.S. 



The Author, having proved that the dorsal fin-spine of the so- 

 called Ischi/oihis ortliorhinus is identical with an ichthyodorulite 

 which has been named Myriacanthas granulatus, inferred that the 

 larger ichthyodorulite M. jmradoxus belonged to the same fish as 

 the larger dentition named Prorjnathodas Guentheri by Egerton. 

 This question has been settled by the discovery by Mr. S. Curtis, in 

 the Lower Lias of Black Yen, of a dorsal fin-spine in direct con- 

 nection with a mass of decayed cartilage, dermal plates, and teeth. 

 On the specimen the following parts arc recognized : — the left an-d 

 left palatine dental plates, right mandibular dental plate, cartilage 

 of the pectoral arch, praesymphysial tooth, rostral cartilage, frontal 

 spine or tentaculum, and vomerine dental plate, dermal plates, and 

 the dorsal fin-spine. The new fossil warrants the conclusion that 

 Myriacantlius is a Chimgeroid, closely similar to the Ujjper Jurassic 

 Chivufropsis, with (i) a median chisel-shaped tooth in front of the 

 lower jaw, (ii) a few tuberculated dermal plates on the head, and 

 (iii) a tuberculated dorsal fin-spine. In these respects it differs 

 from all other known Chimffiroids — even from the coraparatively- 

 l)rimitive types which have been discovered during recent years in 

 the Japanese seas. The Myriacanthidtc, in fact, have still no 

 nearer ally than CaUoi-hynchus, with which ]*]gerton originally 

 compared his so-called Ischyodus orthorJiinus. 



