38 NEW SPECIES OF FOSSILS. 



Brachiopoda, p. 68, points out, that no spiral coils had been no- 

 ticed in the genus Cyrtina by any author. By working at some 

 silicified specimens with acid, I have been so fortunate as to dis- 

 cover these organs in two species. Their position is the same as 

 in Spiri/era, but the first two coils are (at least in one of the spe- 

 cies, C. Dalmani, Hall) connected a little in front of the mid- 

 length by an apparatus somewhat like that of Spirigera, but not 

 so complicated. A very slender process springs upwards to- 

 wards the ventral valve, from each coil, and at the height of 

 about one line, curves forwards. The two then unite, and form 

 a single band, which extends forwards to about the front of tha 

 coil, and there ends in an obtuse point. This connecting process 

 I have only seen in one specimen of C. Dalmani. The other 

 species appears to be new, and I shall describe it under the name of 



Ctrtina Euphemia. (N. sp.) 

 A B 



Cyrtina Uuphemia, (N. sp.) A, ventral view, B, dorsal view, 

 shewing the area and spiral coils. 



Description. — Shell rather large ; ventral valve moderately con- 

 vex, irregularly depressed pyramidal, sub-semi-circular, the margin 

 undulated in its outline by the large radiating folds ; mesial sinus 

 commencing in a point at the beak, and gradually enlarging so 

 that its width at the front margin is equal to nearly one third the 

 whole width of the shell at the hinge line. On each side of the 

 mesial sinus, a single large rounded rib or fold, nearly equal to 

 the width of the sinus, becoming angular near the beak. Near 

 the cardinal edges there are two other obscure depressed convex 

 folds, one on each side. Area concave, at right angles to the 

 plane of the margin in the lower third, but incurved in the upper 

 two thirds. Beak minute, pointed and incurved a little over the 

 cardinal edge. Foramen narrow, its width at the hinge line equal 

 to half the height of the area, closed by a thin convex deltidium 

 in the lower half; in the upper half, open and shewing, within, the 



