at all. The only traces of the connecting processes consist in occasional .spiuiforni or tubercu- 

 lar projections of the epitheca, which do not, however, reach contiguous corallines. According 

 to Mr. Hillings, the distance between the corallitcs varies from three to eight lines ; but in all 

 the specimens I have seen, the distance is less than this. In fact, owing to the flexuous 

 course taken by the corallites, and more especially to their being by no means strictly par- 

 allel, their distance apart is very variable ; and they are very often in contact for considerable 

 distances. In the absence of septa and in possessing infundibuliform tabulae, the present form 

 agrees with the normal examples of Syringopora. 



Local it it i/ ml Fiin/inf/iiii. Rare in the Corniferous Limestone of Lot 6, Con. 1. Wainflec't. 

 Also at Woodstock (Billings). 



Genus AULOPORA (Goldfuss). 



Corallum creeping, increasing by parietal gemmation ; the corallites pyriform, trumpet- 

 shaped, or cylindrical, the cavity of each communicating with that of the one from which it 

 springs. No tabulae ; septa absent, or represented in a rudimentary form by longitudinal 

 striae, or rows of minute spines. 



The corals of the genus Aulopora have often the closest resemblance to young colonies of 

 Syrmgopora, before the latter have commenced to throw up corallites vertically. There is thus 

 reason to think that some of the described species of Aulopora may be truly of the nature of im- 

 mature examples of Syringopora, though others appear to be undoubtedly mature and distinct, 



Mr. Billings has described three species of this genus, all peculiar to Canada, from the 

 Cornifcrous Limestone of Western Ontario, and all of these have come under^my notice. I 

 have also to record specimens which appear to be in every respect undistinguishable from A, 

 tubceformis (Goldfuss). 



43. AULOPORA FILIFORMIS (Billings). 



Aulopora filiformis (Billings), Canadian Journal, New Series, Vol. IV. p. 119. 



Corallum fixed, creeping, forming somewhat confused groups, which adhere parasitically 

 to foreign bodies. Corallites about one-third of a line in diameter. Epitheca thick, with 

 numerous fine encircling striae. Corallites usually budded forth at intervals of from one-third 

 of a line to a line, sometimes further apart, their length being from half a line to a line and 

 a-half. Generally, the young corallites are produced in an alternating manner upon the two 

 sides of the parent stem, but not uncommonly two, three, or four tubes may be produced at a 

 single point, and any individual corailite may commence to throw,out buds for itself. The 

 tubes are often more or less bent, and their apertures are elevated above the surface upon 

 which the coral grows. 



This beautiful little species 

 is of common occurrence in the, 

 Hamilton formation, growing 

 parasitically upon tipirifera 

 mucronata, Cyrtina Hamilto- 

 nensis, Heliophyllum Halli, Cys- 

 iiphyllwm vesiculosum, the 

 epitheca of species of Favosites, 

 c. ^t is readily distinguished 



a from the other species of the 



genus by the small size of the 



Fig. 11. tubes, and also by its peculiar 



a. Aulopora, filiformis (Hillings), growing parasitically upon Spirifera mucrona- mode of growth. It is allied 

 to. 6. Portion of the same enlarged. Hamilton Formation, Arkona. to Aulopora arachnoi</m(Ha\\) 



of the Trenton Limestone, but is a larger form, and occurs in more reticulating and com- 

 pressed groups. 



Locality and Formation. Common in the Hamilton Formation of the Township of Bosan- 

 quet. Very rare in the Corniferous Limestone (Billings).* 



*The fossil which I described under the name of Alecta? Canadenxis (Canadinn Xnturalisst, Vol. vii., No. 3), wa- 

 fouuded upon casts obtained in the Corniferous Limestone. Having now obtained examples from the Hamilton group, in 

 which the uctual fossil itself is preserved, I am disposed to regard this singular form as a somewhat anomalous Aulopora. 

 shall, therefore, describe it in the Appendix to this Report, under the name of A ulopora Canadeniis. 



