312 THE CARBONIFEROUS SYSTEM. 



from the side. Septa distant from each other rather less than one 

 half the diameter. Resembles 0. laterale, but is smaller, more cylin- 

 drical, and with the septa more distant in proportion. 



Orthoceras laqueatum, Hartt (Fig. 128), coll. Hartt, Windsor. — 

 Round, with submarginal siphuncle, and about twenty-six regular 

 smooth flutings. Resembles A. Gesneri^ De Koninck, but differs in 

 being round, destitute of sculpture on the flutings, and with septa 

 more distant from each other — about one-third of the diameter of the 

 shell. 



Orthoceras perstrictum, n. sp. (Fig. 129), coll. Hartt, Windsor. — A 

 fragment of a small species with very regular transverse microscopic 

 strife, much finer than those of 0. conquestum, Koninck, the siphuncle 

 sub-marginal, and the septa deeply concave, and distant from each other 

 nearly the diameter of the shell. 



Fig. 129. — Orthoceras ■perstrictum. Fig. 130. — Serpulites Eortonensis. 



Articulata. 



Spirorhis angulatus, n. sp., coll. J. W. D., AVindsor, on shells of 

 Brachiopods. — Differs from Spirorhis carhonarius in the angular form 

 of the whorls, which rise to an edge above, and in being smooth, with 

 fewer whorls more rapidly increasing in size. It is very like the 

 modern S. Nautiloides of our coasts. 



Serpulites Hortonensis, n. sp. (Fig. 130), coll. Professor How, Half- 

 way River. — Smooth or obscurely annulated, half a line in diameter. 

 Nearly straight toward the aperture, coiled in a discoid manner at the 

 smaller end. Some specimens have a grooved appeai'ance longitu- 

 dinally, but I believe this to be due to crushing. This shell perhaps 

 belongs rather to the Lower Coal formation shales than to the pro- 

 perly marine beds. 



Serpulites annulatus, n. sp. (Fig. 131), coll. H. Poole and C. F. Hartt, 

 Windsor. — Cylindrical, about a line in diameter, coarsely marked with 

 rings of growth and coiled in a loose irregular spiral. 



Serpulites inelegans, n. sp., coll. Hartt, Windsor, bed {b). — Cylindrie, 

 tapering, marked with faint transverse striaj, slightly waving in form ; 

 greatest diameter, l-6th inch ; length, 1|- inch. 



Beyrichia Jonesii, n. sp. (Fig. 132), coll. Hartt, Windsor. — Length 

 about 1-lOth inch, breadth 2-3ds of length. Very tumid; surface 



