ARA. COR.] 



ANNELIDA. 



517 



WORM-BURROWS. Arenicolites, Gyrichnites, Myrianites, Monocraterion, Ne- 



mapodia, Nereites, Palseochorda, Scolithus, Walcottia. 

 ORDER TUBICOLA. Conchicolites, Cornulites, Salterella, Serpula, Serpulites, 



Spirorbis. 

 ORDER UNCERTAIN. Protoscolex. 



ARABELLITES, Hinde, 1879, Quar. Jour. Geo. 



Soc. Lond., vol. 35, p. 377. [Ety. Ara- 



bella, an existing genus; lithos, stone.] 



Jaws with an extremely prominent an- 



terior hook, and a row of smaller teeth 



on a wide base, sickle-shaped jaws, and 



also subquadrate forms, with a straight 



upper edge of small teeth. Type A. 



hamatus. 

 ascialis, Hinde, 1879, Quar. Jour. Geo. Soc. 



Lond., vol. 35, p. 378, Hud. Riv. Gr. 

 cervicornis, Hinde, 1879, Quar. Jour. 



Geo. Soc. Lond., vol. 35, p. 379, Hud. 



Riv. Gr. 

 cornutus, Hinde, 1879, Quar. Jour. Geo. 



Soc. Lond., vol. 35, p. 377, Hud. Riv. Gr. 

 crenulatus, Hinde, 1879, Quar. Jour. 



Geo. Soc. Lond., vol. 35, p. 379, Hud. 



Riv. Gr. 



cristatus, see Eunicites cristatus. 

 cuspidatus, Hinde, 1879, Quar. Jour. 



Geo. Soc. Lond., vol. 35, p. 378, Hud. 



Riv. Gr. 

 elegans, Hinde, 1879, Quar. Jour. Geo. 



Soc. Lond., vol. 35, p. 382, Clinton Gr. 

 gibbosus, Hinde, 1879, Quar. Jour. 



Geo. Soc. Lond., vol. 35, p. 378, Hud. 



Riv. Gr. 

 hamatus, Hinde, 1879, Quar. Jour. Geo. 



Soc. Lond., vol. 35, p. 377, Hud. 



Riv. Gr. 

 lunatus, Hinde. 1879, Quar. Jour. Geo. Soc. 



Lond., vol. 35, p. 378, Hud. Riv. Gr. 

 obliquus, Hinde, 1879, Quar. Jour. Geo. 



Soc. Lond., vol. 35, p. 379, Hud. Riv.Gr. 

 ovalis, Hinde, 1879, Quar. Jour. Geo. Soc. 



Lond., vol. 35, p. 378, Hud. Riv. Gr. 

 pectinatus, Hinde, 1879, Quar. Jour. 



Geo. Soc. Lond., vol. 35, p. 379, Hud. 



Riv. Gr. 

 politus, Hinde, 1879, Quar. Jour. Geo. 



Soc. Lond., vol. 35, p. 385, Ham. Gr. 

 quadratus, Hinde, 1879. Quar. Jour. 



Geo. Soc. Lond., vol. 35, p. 379, Hud. 



Riv. Gr. 

 rectus, Hinde, 1879, Quar. Jour. Geo. Soc. 



Lond., vol. 35, p. 378, Hud. Riv. Gr. 



p. 

 de, 



pearance of worm-burrows, like those 

 of the Arenicola. Type A. sparsus or 

 A. didyma. 



sparsus, Salter, 1856, Quar. Jour. Geo. 

 Soc., vol. 13, p. 203, Clinton Gr. 



spiralis, Torell, 1868, as identified by Bill- 

 ings, Pal. Foss., vol. 2, p. 77, Up.Taconic. 



woodi, Whitfield, 1882, Geo. Wis., vol. 4, 



p. 177, Potsdam Gr. 

 Aulacodus obliquus, see Lumbriconereites 



obliquus. 



CONCHICOLITES, Nicholson, 1872, Am. Jour. 

 Sci. and Arts, 3d ser., vol. 3, p. 202. 

 [Ety. concha, shell ; colo, I dwell ; lithos, 

 a stone.] Tubes conical, slightly curved, 

 walls thin, composed of imbricating 

 rings. Type C. gregarius. Prof. Hall 

 and others regard this genus as a syn- 

 onym for Cornulites. 



corrugatus, Nicholson, 1873, Lond. Geo. 

 Mag., vol. 10, p. 55, Hud. Riv. Gr. 



flexuosus, Hall, 1847, (Tentaculites flexu- 

 osus,) Pal. N. Y., vol. 1, p. 92, Trenton 

 and Hud. Riv. Grs. 



scutellatus, Hinde, 1879, Quar. Jour. 



Geo. Soc. Lond., vol. 35, p. 379, Hud. 



Riv. Gr. 

 similis, Hinde, 1879, Quar. Jour. Geo. i 



Soc. Lond., vol. 35, p. 382, Niagara Gr. i 

 similis var. arcuatus, Hinde, 1879, Quar. j 



Jour. Geo. Soc. Lond., vol. 35, p. 385, i 



Ham. Gr. 

 ARENICOLITES, Salter, 1856, Quar. Jour. Geo. 



Soc., vol. 13, p. 199. [Ety. arena, sand ; 



colo, I inhabit; lithos, stone.] Circular 



holes which appear in twos on the sur- 



face of sandstones, and have the ap- 



FIG. 936. Couchicolites flexuosus, on Stropho- 

 mena alternata. 



intermedius, Nicholson, 1874, (Ortonia 

 intermedia,) Geo. Mag., n. s., vol. 1, p. 

 199, Ham. Gr. 



minor, Nicholson, 1873, (Ortonia minor,) 

 Lond. Geo. Mag., vol. 10, p. 56, Hud. 

 Riv. Gr. 



CORNULITES, Schlotheim, 1820, Petrefakten- 

 kunde,p. 378. [Ety. cornu, horn; lithos, 

 stone.] Tube gradually tapering, con- 

 ical, slightly flexuous, small end usu- 

 ally curved, and attached to some for- 

 eign body ; walls thick, cellular, 

 composed of numerous imbricating 

 rings, their widest edge next the slen- 

 der base ; external surface annulated, 

 finely striated longitudinally; inner 

 surface and casts scalariform, with two 

 or three longitudinally impressed fur- 

 rows. Type C. serpularius. 



34 



