37 



as large as the main stem. Cells ovate, uniformly rounded at both ends, 

 their length about one-half greater than their width, a distinctly elevated 

 margin all round, arranged in straight rows running from end to end of 

 the stipe ; the rows separated by a fine, flexuous fihform ridge which has 

 a distinct groove on each side between it and the cells ; from five to seven 

 of the latter in the length of one line. 



The surface occupied by each row of cells is flat, and consequently there, 

 are as many sides to the stipe as there are rows. In the specimens upon 

 which the above description is founded there appear to be six sides but as 

 they are all fixed to the rock the precise number cannot be determined with 

 certainty. There are numerous small specimens mixed up among the 

 others on the same slabs some of which have certainly only four sides while 

 others appear to have five. None of them are sufficiently perfect to show 

 whether they possess the lines between the rows of cells on the sides. 

 The least wearing removes these characters, and I cannot at present de- 

 cide whether they should be referred to this or to one or more other spe- 

 cies. Junction Cliff ; Div. 1, A. G. J. Richardson. 



H. FORMOSA. — Polyzoary about one-fifth of a line in thickness and less 

 than an inch in length, apparently four sided. Cells elongate ovate, their 

 ends narrowly rounded ; length about twice the width, an elevated margin 

 at the sides which does not seem to go round the ends; eight to ten in the 

 length of two lines. There are four rows separated by a fine filiform 

 ridge with a groove on each side, and with four or five tubercles to the 

 length of each cell situated on the crest of the ridge. East Point ; Div. 

 2, A. G. J. Richardson. 



H. CONCAVA. — Polyzoary apparently four-sided from one-sixth to one- 

 third of a line in thickness. Cells elongate ovate, most deeply excavated 

 at the lower extremity, the bottom gradually rising to the upper margin, 

 which is scarcely distinct from the general surface. There are from five 

 to eight cells in two lines. The angles of the stem are prominent and 

 distinctly defined, sometimes nodulose, the celluhferous faces concave 

 when perfect, but when the angles are worn off they appear to be flat. 

 Two miles East of Jupiter River, East Point and at various other locah- 

 ties in Divs. 2 and 3, A. G. J. Richardson. 



H. STRIGOSA. — Polyzoary sub-polygonal, from one-fourth to one-half 

 of a line in thickness, less than an inch in length, branched. Cells ovate, 

 length about one-third greater than their width, arranged in longitudinal 

 rows, with an elevated margin which is occasionally obsolete at either one 

 or at both ends of the cell, but almost always well developed at the sides 

 thereof. The distance of the cells from each other varies from ^ to f of 

 a line. Length of the cells about ;| of a line. There appear to be four or 



D 



