NATURAL HISTORY SOCIETY OF GLASGOW. 331 



and bounded on the outer side by a prominent lip. Cells on 

 bipinnate branches as on stem; those on branclilets alternate, 

 smaller, and barely their own length apart. Branches at an 

 angle of 40" with stem, and strongly bent back towards the reverse 

 face. The obverse is covered with fine granules; and the keel, 

 which is gently rounded, and about one-third the diameter of 

 the stem, bears numerous small tubercles, at irregular distances, 

 and set near one or other side. The keel of the branches is 

 formed by a series of sharp tubercles, one corresponding to each 

 pair of cells. The outer lip of the cell is sometimes projected in 

 a blunt tubercle. The reverse face of the stem and V)ipinnate 

 branches is evenly rounded and finely granulo -striate; a regular 

 row of small tubercles marking the middle line. The reverse of 

 the branches is distinctly striate, and the granules are larger 

 than on the stem. Cells, eighteen; branches, nine on each side 

 in one quarter inch. 



Localities: Lower Limestone, Hairmyres, E. Kilbride, and Beith, 

 Ayrshire. 



The backward flexure of the short branches is the most 

 distinctive character of this species; the deeply buried appearance 

 of the cells being second in importance. From G. Icuxi, which 

 likewise has buried cells, the flexure of the branches, and the 

 regularity of the intervals at which they are given off, serve as 

 diao-uostic characters. 



"c 



Glauconome laxa, sp. nov. 



Plate iv., Figs 33, 34. 



Polyzoary erect, pinnate, at intervals bipinnate. Stem rounded, 

 slightly curved from side to side; the convexities corresponding 

 to the branches on the alternate equidistant pinnule; cells oval, 

 alternate, their own length apart; bounded on the inner side by 

 the keel, and on the outer by a slight lip — two between the pin- 

 nules, and one at the base of each pinnule. Keel broader than 

 one- third the transverse measurement of the stem; rounded, finely 

 granular, and bearing gently swelling, rounded tubercles: one for 

 nearly every cell. Pinnules tapering, narrower than the stem; 

 keel sharper. Branches as broad as stem; their base as broad as 

 two cells and three intercellular spaces; arrangement of cells and 

 tubercles as on stem. Obverse covered with finely granular striag, 

 which are more distinct and parallel on branches and pinnules. 



