MARYLAND GEOLOGICAL SURVEY 745 



Family HIPPOTHOIDAE 



Genus HIPPOTHOA Lamouroux 



HIPPOTHOA TENUICHORDA (Ulrich and Bassler) 

 Plate XL VI, Fig. 16 



Stomatopora tenuichorda Ulrich and Bassler, 1907, Geol. Survey of New 



Jersey, Pal., vol. iv, p. 314, pi. xx, figs. 5, 6. 

 Corynotrypa tenuichorda Bassler, 1911, Proc. U. S. Nat. Mus., vol. xxxix, 



p. 513, fig. 11. 



Description. " Zoarium adnate, frequently branching, consisting of 

 uniserially arranged zooecia. Zocecia elongate-pyriform, or club-shaped, 

 0.45 mm. to 0.75 mm. in length, about 0.02 mm. in width at the posterior 

 extremity, increasing very gradually in size through about one-half their 

 length, and then somewhat abruptly to about 0.15 mm. at the rounded 

 anterior end. Zooecial aperture nearly terminal, small, circular, with a 

 slightly elevated, rim-like border, from 0.035 mm. to 0.05 mm. in diam- 

 eter." Ulrich and Bassler, 1907. 



This neat little species was at first thought to belong to the Cycloslo- 

 mata, although its relationship to Hippothoa was noted under the remarks 

 in the original description. Further study has shown that in all proba- 

 bility the species is actually one of the genus Hippothoa. 



Occurrence. EANCOCAS FORMATION. Noxontown Millpond, Delaware. 



Collection. Maryland Geological Survey. 



VERMES 



CLASS ANNELIDA 



Order POLOCHAETA 



Suborder TUBICOLA 



Family SERPULIDAE 



Genus SERPULA Linne 

 [Systema Naturae, ed. x, 1758, p. 786] 



Type. Serpula seminulum Linne. 



Solitary or gregarious tubi colons annelids; tubes free or adherent, 

 usually more or less contorted or convoluted. 



Etymology: Serpula, serpent. 



