I'rof. H, A. Nicholson — New Devonian Fossils. 199 



Fenestella filiformis, Nicholson, PL IX. Fig. 24. 



Polyzoary exceedingly delicate, composed of parallel, extremely 

 narrow branches, about fifteen or sixteen of which occupy the space 

 of a quarter of an inch. Dissepiments thread-like, narrower than 

 the branches, expanded at their points of junction with the branches, 

 separated by intervals of about one-tenth of a line. Fenestrules 

 one-third wider than long, rectangular or transversely oblong, 

 twenty-four in the space of one-quarter of an inch measured longi- 

 tudinally, and about fifteen in the same space measured transversely. 

 Celluliferous aspect xmknown. 



I have only fragments of this species, and none of these show the 

 celluliferous aspect; but the proportions of the polyzoary are so 

 entirely distinct from all other previously recorded forms, that no 

 question can be entertained as to its being really new. It is very 

 readily distinguished by its filiform and closely-set branches, by the 

 unusual character that the fenestrules are wider than long to a 

 marked extent, and by the extraordinarily large number of fene- 

 strules in a given space measured vertically. 



Locality and Jbrmai/ow.— Corniferous Limestone, Lot 6, Con. 1, 

 Wainfleet. 



Spiboebis Aekonensis, Nicholson, PI. IX. Fig. 25 h and c. 



Tube minute, sinistral or dextral, of two turns, rounded, and 

 somewhat globular, owing to the elevation and large size of the last 

 turn. Aperture circular, usually turned upwards. Diameter of the 

 entire spiral about a third of a line, never exceeding half a line. 

 Surface marked with numerous, very close-set, thread-like, trans- 

 verse annulations or ridges, which are not separated by more than 

 their own width. A minute umbilicus is present. 



I am unable to identify this little species with any previously re- 

 corded. It presents the peculiarity that individuals in other respects 

 precisely similar (Fig. 25, b and c) are sometimes dextral, and at 

 other times sinistral, the latter being the commonest upon the whole. 

 The terminal portion of the tube is sometimes continued to open 

 in the plane of the spiral, or at other times is non-adherent and 

 slightly elevated above the surface. The species is very readily 

 recognized by its minute size, and the characters of its surface orna- 

 mentation. It appears to be quite distinct from S. angulaius, Hall, 

 which, so far as I am aware, is the only species before recorded 

 from the Hamilton Formation. 



S. ArTconensis is found in great abundance, generally associated 

 with S. omplialodes, Goldfiiss (Fig. 25, a), attached to the exterior of 

 Heliopliyllum Halli, Cystipliyllum Americanum, Gystiphyllum vesiculo- 

 sum, Spirifera mmronata, and other Corals and Brachiopods of the 

 Hamilton Group. 



Locality and Formation. — ^Hamilton Formation, Bartlett's Mills, 

 near Arkona, Township of Bosanquet. 



Ortonia intermedia, Nicholson, PL IX. Fig. 26. 



Tube conical, straight or flexuous, attached by the whole of one 



