58 CONTRIBUTIONS TO CANADIAN PALAEONTOLOGY. 



present a rugged or knobby appearance from the great number of the 

 connecting tubes. The diameter of the corallites is one-third of a line, 

 or a little more. The tubes of connection are distant from two-thirds of 

 a line to one line and a half. The distance between the corallites is for 

 the greater part less than their diameter. The young corallites branch 

 from the sides of the adult individuals, and immediately become parallel 

 with the parent, and connected with it again by the usual tubes of con- 

 nection." (Billings.) 



S. Hisingeri seems to have had, as a rule, a comparatively small base 

 of attachment and to have had an upright growth with the height much 

 greater than the breadth. As in 5. perelegans, the corallum began its- 

 growth as an aggregation of flattened, prostrate corallites, forming a 

 lamellar or an open reticulated base, from which at regular intervals the 

 corallites ascend by a sudden upturn. The corallites in some specimens 

 reach a thickness of half a line. 



Mr. Billings was of the opinion that this species is closely allied to 

 Edwards and Haime's S. Verneuili and S. Cleviana, both from the- 

 Onondaga and Corniferous limestones of Ohio. Unfortunately the Ohio 

 specimens were not figured, and in the case of the last named species the 

 description is very meagre and altogether inadequate. As regards S. 

 Verneuili it differs, judging from the very short description, from S. 

 Hisingeri in having its corallites much farther apart. In the numerous 

 specimens belonging to the collection of this survey, the corallites are 

 seen to be almost always separated by a space equal to or less than their 

 diameter, whereas in <S'. Verneuili, the corallites are said to be distant 

 two or three times their diameter. 



Devonian.— Found in the Corniferous limestone of Ontario ; Long Port- 

 age, Missinaibi River to Moose Factory (Corniferous), R. Bell, 1877.* 



An examination of the type of Aulopora Rliformis, Billings, has led to 

 the conclusion that it belongs to the genus Syringopora and is most likely 

 the basal reticulation of Syringopora Hisingeri, Billings. The specimen 

 described by Billings is adherent to and covers a dorsal valve of Strep- 

 torhynchus Pandora, Bill, with an open reticulation of prostrate tubes- 

 which arc attached to the shell by the entire lower surface. Toward the 

 centre and on one side of the reticulation the tubes rise to a greater height 

 than elsewhere and are connected together by transverse processes. The 

 broken ends of some of the tubes show in transverse section what appears 

 to be a syringopora-like structure, viz.: the remains of a central tube and 

 of, though less clearly, invaginated tabulae. On account of the slenderness- 

 of the tubes and the damage already done to the specimen by having been 



* See foot-note on page 56. 



