302 Systematic Palkoxtology — ^Iiddle Devonian 



three or more line, regular, transverse striae — the usual number on the 

 larger part of the tube being four or five, but sometimes increased, in 

 exceptionally wide spaces, on some individuals, to eight.*' Hall, 1879. 



Hall gave the entire length of the fossil as ten to twelve mm., rarely 

 a little more and stated that it occurred as casts and impressions of the 

 exterior sb.ell in argillaceous sandstone. He nho said that in general 

 character and details of surface-marking it was very similar to T. hcUuIus 

 Hall, but differed in smaller size and in the irregularity in distance of the 

 annulations. Among other localities it was reported from Saddleback 

 Ridge, Huntingdon County, in southern central Pennsylvania. 



A number of specimens which are identified as this species have been 

 noted in arenaceous shales or thin-bedded sandstones in Maryland. They 

 are mainly external impressions of the shell although occasionally a por- 

 tion of the interna] impression is preserved. The annulations occur at 

 unequal distances between which, near the aperture, are from three to 

 five clearly marked striae, but the number of striae decrease toward the 

 apical end until near that extremity there are none. Near the aperture 

 of the shell there are eight annulations in a distance of 5 mm. It is 

 thought that the size, irregularity in distance of the annulations, number 

 and occurrence of the transverse striae satisfactorily refer these speci- 

 mens to Tentaculites attenuatus. 



Length, of most complete specimen, about 10 mm., but the extremity is 

 wanting; width, at aperture, 1-^ mm. 



Occurrence. — Romney Foiuiation, Hamilton Membek. On National 

 Eoad \ mile west of Tonoloway Eidge; McCoys Ferry; southwest of Mc- 

 Coys Ferry ; \ mile north of Green Spring Furnace. 



Collection. — Maryland Geological Survey. 



Tentaculites bellulus Hall 

 Plate XXXYII, Figs. 22-25 



Tentaculites bellulus Hall, 1876, Illustrations Dev. Fossils: Pteropoda, pi. 



xxvi, figs. 15-18. 

 Tentaculites belluhis Hall, 1879, Pal. N. Y., vol. v, pt. ii, p. 169, pi. xxxi, figs. 



15-18, pi. xxxi A, figs. 48-51. 

 Tentaculites bellulus Grabau and Shimer, 1910, N. Am. Index Fossils, vol. ii, 



p. 11, fig. 1222. 



