400 PROCEEDINGS OP THE AMERICAN ACADEMY. 



the supposed impression of an Annelid, and the track either of a mollusc 

 or worm. We now have to announce the discovery of additional animal 

 remains and tracks detected by Mr. J. H. Clarke of Providence, who for 

 nearly thirty years has industriously collected in this coal field. These 

 comprise casts of a fresh-water bivalve, Anthracomya arenacea, small 

 footprints, possibly those of a shrimp-like animal {Protichnites carhon- 

 arius), and an impression which seems to be rather worm-like than plant- 

 like. 



We will enumerate these forms in a way to give a conspectus of the 

 animal life of che Narragausett coal basin, so far as known up to the 

 present time. 



Annelida. 



Spirorbis carhonarius. Pawtucket plant beds. (Scholfield and Gorham) Proc. Bost. 



Soc. Nat. Hist, xxiv, 1889, p. 214. 

 Impression of an Annelid? Pawtucket plant bed. (Scliolfield) Ibid., p. 215. 



Impression of a plant or worm ? This marking or impression was 

 found by Mr. J. H. Clarke in a boulder of fine red shale at South Attle- 

 boro, Mass. Whether it is an impression of an aquatic plant or of a 

 worm I am not sure, but am rather inclined to regard it as a worm-cast. 

 It is serpentine, with from four to five curves, no two curves alike. In 

 front it ends broadly, is pointed triangularly, tapering more at what 

 appears to be the posterior end. Length 70 mm. ; greatest breadth 

 4 mm. 



Sections of %corm holes. I am indebted to Mr. J. B. Woodworth for 

 the opportunity of visiting with him an interesting quarry, one mile south 

 of East Attleboro, in red and green shales and light conglomerates, the 

 greenish shales showing distinct coarse ripple marks, rain-drops, and mud 

 cracks, besides numerous sections of worm holes, perpendicular to the 

 bedding. The worm holes are abundant, some eight or ten to the square 

 inch, and varying in size from ^^ to J of an inch in diameter. The 

 round deep holes had been excavated in a fine mud, and then, after the 

 worms had left them or died, silted up with fine sand. If the worms 

 which made these deep holes were fresh-water forms they were much 

 larger than any Nais like Oligochetes known to us at the present day, 

 and were possibly therefore marine. 



MOLLUSCA. 



Anthracomya arenacea (Dawson) Hind. (Fig. 1, A, B, C.) These 

 occurred in a small boulder of fine black shale found by Mr. Clarke at 



