36 DEVONIAN FAUNA. 



about f mm. apart, elevated, coarse, sloping upward, and curving in the centre 

 so as sometimes to alternate and interlock at an angle of about 160°, or 

 sometimes to meet in a continuous curve ; alternating and interlocking at the 

 margins. Interstrial spaces about four times the width of the striae, transversely 

 but irregularly lineated inside, and showing signs of coarse crenulation within 

 immediately under the strise, and very j&ne oblique lines on the outer surface. 



Locality. — One specimen from Pilton is in the Porter Collection, 



Remarhs. — While this fossil gives abundant evidence that it belongs to the 

 genus Gonularia, it is insufficient for very definite determination. It is flattened 

 and too fragmentary to show its exact shape, and the inner surface is the only 

 part well displayed. At the same time several characters are more or less clearly 

 indicated. Besides the points which are at first sight apparent, there may be 

 observed signs of a deep angular grooving at the corners, and in one portion, 

 where the cast of the outside surface seems exposed, a very fine and oblique 

 lineation is visible, which may, however, be partly due to accident. The striae are 

 not perfectly regular, seventeen on one side of a face corresponding to twenty on 

 the other. 



In the points observable it appears so closely to resemble G. defiexicosta, 

 Sandberger, that these seem sufficient reason to refer it (presumptively) to that 

 species. 



G. continens, var. rudisy Hall, seems only to difi'er from Sandberger's figure in 

 being more strongly ornamented, and being rather shorter in shape, and in these 

 points perhaps more nearly resembles our specimen. 



Affinities. — Of the species described by d'Archiac and de Yerneuil it seems 

 most nearly to resemble G. ornata^ but its striae are not so strongly angulated, 

 while those of G. Brongniarti, d'Arch. and de Vern.,^ are centrally continuous. 



G. Salinensis, Whiteaves,^ has much coarser and fewer tubercles. 



II. Family — Tentaculitid^, Walcott. 

 1. Genus — Tentaculites, Schlotheim, 1820. 

 1. Tentaculites conicus, F. A. Bomer. Plate IV, figs. 14, 14 a, 14 6. 



1850. Tentaculites conicits, F. A. Bomer. Beitr. Harz., pt. 2, p. 80, pi. xii, 



figs. 20 a, b. 



1 1842, d'Archiac and de Verneuil, ' Geol. Trans.,' ser. 2, voJ. vi, pt. 2, p. 352, pi. xxix, 

 figs. 5, 5 a. 



2 Ibid., p. 352, pi. xxxi, figs. Q—Q c. 



» 1891, Whiteaves, ' Cont. Canad. Pal.,' vol. i, pt. 3, p. 244, pi. xxxii, figs. 9, 9 a. 



