on 



mented with twelve small rough tubercles. The septa seem to be only 

 incipiently developed, but they can be distinctly seen in the inside of the 

 cup as so many small vertical ridges ; there appear to be twelve of them. 

 The tabulae are somewhat irregular, being either horizontal, obUque, flat, 

 convex or concave, from two to four m one line. The coenenchyma is 

 composed of small vesicular cells from one-sLxth to one-third of a line in 

 diameter. The surface between the cells is, when perfectly preserved, 

 covered with small rough tubercles. When the specimens are worn, the 

 surface presents only the circular apertures of the cells, and is destitute of 

 granulation. 



Only six specimens of this species were collected, and they are all of 

 the clavato-turbinate form. It is possible that hemispherical or globular 

 colonies may exist, as there is much variety in the form in species of this 

 genus. Some of the cells are nearly two lines in diameter, others less 

 than one line. 



By the size of the cells this species is distinguished from all others of 

 the genus except H. megastoma (McCoy) and H. maerostylus (Hall). 

 From these it differs in the structure of the tissue between the tubes. In 

 H. megastoma the cells of the coenenchyma are arranged in polygonal 

 columns. Such, also, seems to be their structure in H. maerostylus. 

 The species which Edwards and Haime have placed in their genus Lyellia 

 L. Amerieana and i. glabra, have the tubes rather more widely separated 

 and the septa more strongly developed. Junction Cliff; Div. 1, A. G. 

 T. C. Weston. 



H. EXIGUUS, B., op. cit., p 428. — Cells about half a line in diameter 

 and somewhat more than their own width distant from each other, with 

 thin elevated margins, apparently not crenulated. Septa not visible in 

 the only specimen collected. Tabulae numerous, four to six in one line. 

 Coenenchyma minutely vesicular. 



As the specimen is somewhat worn, it is possible that the margins of the 

 cells when perfect may be crenulated. The coenenchyma appears to be 

 vesicular, but more specimens are required to decide this point. 



This species on account of the small size of the cells and their greater 

 proportional distance from each other, seems to be distinct from all the 

 others. Gamache Bay ; Div. 1, A. G. T. C. Weston. 



H. SPARSUS, B., op. cit., p. 428. — Cells varying from half a line to one 

 line in diameter, distant from one to three lines from each other. Radi- 

 ating septa much developed, sometimes meeting in the centre. The coen- 

 enchyma varies in structure, being in some places entirely vesicular, and 

 elsewhere composed of vertical series of square cells as in H. megastoma. 

 These variations are seen in the same specimen. Chicotte River ; Div. 

 4, A. G. J. Richardson. 



