476 Prof. F. M'Coy on some new Silurian Radiata. 



9i plicated edges of the radiating lamellse), from thence to the 

 9 (Walls made up of small, thick, rounded, vesicular plates^. the 

 ^6<obscure rows having a slight downward curve. a-ioD irxo^aiq 



One worn specimen from Dudley, in the collection of Count 

 Miinster, was considered by him and Dr. Goldfuss to be a variety 

 of the Cyathophyllum dianthus (Goldf.) of the Devonian rocks, 

 from which I find it difi'ers generically. 



Not uncommon in the Wenlock limestone of Dudley, Stafford- 

 shire. 



{Col University of Cambridge.f^^^'^^^^^^^ 

 -m^giT0igniiq.z9iX'jq£f„ , . ,,r ^ IIbioU ,\^Xii\0 ,«{<^ 



^^rfjf.f^^rr pirrc^rr.rr.c.p.Cosmtes stngatus (M'Coy). ^rr^^o ^'?'^fi??T')t 



Sp. Char. Corallum forming cylindrical, dichotomous branches, 



. 2 to 3 lines in diameter ; surface with small, narrow, trian- 



8^' gular cells, the base of the triangle below, and the apex usually 



aijmore or less prolonged upwards into a vermiform channel, 



'it»;often upwards of half a line long ; four to five rows of cells in 



the space of 1 line, measured transversely, about two in the 



same space measured longitudinally ; compact interstitial space 



^ between the rows of cell-openings usually rather exceeding 



_l their width. 



f; The usual compact appearance of the CceniieSy combined in this 

 species with the interrupted scratch-like channels of the cell- 

 mouths, completely distinguish it from SLuy .species pfFavpsites 

 or Stenopora. ,;0gi_r so-ionio gwoi ov/J 'n\^ vifio ifliv/ ^,9i(r-o|i hun 



Not uncoinD^ii^!^%W^D|©c]y^st<m 

 shire. jO ^^vktr^ '\o M jnw3 j oiGia \mnd7mlf''io .M 



u<(CoL University of t:Jambridg€*)^a^^-iU iioi'^ bb^n^M ^o g^tulg 



Falceopora subtilis (M*L/oy). 



Sp. Char. Corallum forming cylindrical branches, usually 1^ to 

 2 lines in diameter ; large stellular tubes about one-sixth of a 

 line in diameter, and a little more or less than their diameter 

 apart ; polygonal intervening tubuli invisible to the naked eye, 

 usually five between adjacent cell-tubes, or about thirty in the 

 space of 1 line ; three cell-tubes with their intervening tubuli 



'''■ ' in a space of 1 line ; main tubes often weathering as separate 

 sulcated columns. 



In the middle of the branches the cell-tubes seem to be 

 parallel and vertical, but diverge rapidly at the circumference to 

 reach the surface ; they are very often weathered as separate tu- 

 buli, as in P. subtubulata and P. tuhulataj and on the other hand 

 they often break away from casts of the surface, leaving so little 

 trace among the intervening tubuli, that the surface seems merely 

 shagreened under the lens, bearing some resemblance to the 



