236 THE CANADIAN NATURALIST. [Vol. VlL 



where there are about 90 low rounded septa, somewhat unequal 

 in size but in general 6 or 7 in the width of ^ an inch. As all 

 the specimens seen, are partially filled with siliceous limestone,^ 

 which cannot be removed by the application of acid, I have not^ 

 therefore, been able to ascertain the characters of the bottom of 

 the calice. Corniferous. 



11. H. EXCELLENS. — Corallum turbinate, moderately curved, 

 expanding to a diameter of 2J inches in a length of 6. Surface 

 with numerous more or less angular folds of growth. Depth of 

 calice 21 lines. Septa about 100 at the margin, rounded, slightly 

 elevated, becoming sharp-edged and serrated as they descend.. 

 Bottom of the calice, striated by the edges of the large septa, a 

 few of which reach the centre and ascend the columella. The 

 latter 2 or 3 lines in height. A large and deep septal fossette. 

 Corniferous. 



12. H. COMPTA. — Corallum turbinate, curved, expanding to 

 a diameter of 18 lines, in a length of 4 inches. Surface with 

 rounded or sub-angular folds of growth. Calice 12 lines in depth. 

 No columella. A moderate sized, septal fossette. There are 

 about 100 septa at the margin of the cup. Corniferous. 



13. H. PROLIFICA. — This species was published in Canadian 

 Journal, March, 1859, and was made to include a number of 

 closely allied forms, which could not be then separated for want 

 of sufficient material. I now propose to confine it, to the group 

 typified by the specimen figured with the original description, 

 and in the Geology of Canada, page 365. It may be thus de- 

 scribed — Corallum simple, turbinate, curved, expanding to a 

 width of from 18 to 24 lines in a length of from .! to 4 inches. 

 Surface with a few undulations of growth. Septal striae 8 to 10 

 near the base and 6 to 8 in the upper part in a width of 3 lines. 

 Septa from about 100 to 120 at the margin (where they are all 

 rounded), most common number from 100 to 110. In general 

 they alternate in size at the margin ; the small ones becoming 

 obsolete on approaching the bottom of the calice ; the large ones 

 more elevated and sharp edged. The septal fossette is large and 

 deep, of a pyriform shape, gradually enlarging, from the outer 

 wall inwards for one-third, or a little more, of the diameter of 

 the coral, at the bottom of the calice. Its inner extremity is 

 usually broadly rounded or, sometimes, straitish, in the middle. 

 It cuts off the inner edges of from 8 to 12 of the principal septa 



