38 



five rows of cells. Surface longitudinally striated. Where the stem 

 gives oflf a branch the latter is sometimes at its base, cylindrical, destitute 

 of cells and strongly striated for the length of about one line. Junction 

 Cliff, Anticosti ; Div. 1, A. G. J. Richardson. 



H. NODOSA. — Polyzoary rudely cylindrical; cells elongate ovate, one 

 end rounded and deeply impressed, the other pointed or minutely 

 truncated and scarcely distinct from the surface ; an elevated tubercle 

 between each two cells which appears to have often a rounded pit in its 

 apex. This gives to the stems a nodose appearance. There are three 

 or four cells in the length of one line, and they seem to be arranged 

 in five or six longitudinal rows. Two miles east of Jupiter River and at 

 East River ; Divis. 2, 3, A. G. J. Richardson. 



H. LiNEOPORA. — Polyzoary cylindrical, sometimes branched, about 

 one-third of a hne in thickness and from three to eight lines in length, the 

 surface covered with minute extremely elongated cells which are most 

 deeply impressed at their lower extremities. Under the microscope the 

 surface appears to be simply striatted longitudinally and without cells ; 

 but on further examination what appear to be stride are in fact the cells. 

 This species might perhaps form the type of a new genus. Two miles 

 east of Jupiter River; Div. 3. A. G. J. Richardson. 



H. ARM ATA. — Polyzoary from one-fourth to one-third of a line in thick- 

 ness. Cells sub-ovate with a strongly projecting broad based spine at the 

 lower edge. This spine appears to be concave on the upper side where it 

 receives the cell, and convex on the lower side. There appear to be four 

 or five longitudinal rows of the cells, and they also sometimes form 

 transverse bands around the stem ; in other instances those of contiguous 

 rows alternate with each other. On a side view the spines are triangular 

 in outline, the upper side projecting either straight outwards at a right 

 angle or curving slightly upwards ; the lower side sloping downwards from 

 the point of the spine with a concave descent which extends half way to 

 the cell next below. There are about three cells in the length of one line, 

 and they are distant rather more than their own length from each other. 

 The surface of the stem is longitudinally striated. East Point, Anticosti ; 

 Div. 2, A. G. J. Richardson. 



H. BELLULA. — Polyzoary consisting of small, straight, cylindrical stems 

 of nearly uniform thickness, but usually tapering slightly from the upper 

 to the lower extremity, celluliferous all round. Cells elliptical ; the pro- 

 portional length and width somewhat variable, the latter usually one-fourth 

 less than the former ; the margin, at the sides, thin and distinctly elevated ; 

 a spine or tubercle at the lower end which has the form of a- small four- 

 sided pyramid, the upper side often at right angles, and sometimes sloping 



