'"{"eoi!''] PROCEEDINGS OF TFIE NATIONAL MUSEUM. 289 



RHYNCHOBOLUS L'IimI. 

 Rhynchobolus americanus Verrill, 



Ghjcera amcricana Leidy. M;ir. Invert. Fauna of Rhode Islaml and New Jersey. 



>Joiun. Acad. Nat. Sci. Tliila., ser. '-l, vol. .], p;irt 2, p. 147. 

 liliicoui nnuricana Eiii-KRS. Die Borstonwurmer, pp. 668-<]70, 1*1. XXIII, F'igs. 42-43. 

 lihi/nchohohis utnericanna VKKRll-f-. Inverr. An. Vineyard .Sil., pp. IU"2, .V.Mi, PI. x, Fi^^.s. 



4.'), 4C>; Notes on Nat. Hist, of Ft. .Macon >l'roc. Acad. Nat. Sci. Pliila., Is78, pp. 



'209, 300. 

 Rhynchobolus americanus Wrbstku. Annel. Chiot. Virj^iniau Coast, p. 45. 



Very abundant on various shoals in the harbor. 



Family OPUELIID.E. 

 OPHELINA (Oersted) Orube. 

 Ophelina agilis, sp. nov. 

 (Plate XV, FiRS. 21-26, 28.) 



Body cylindrical, smooth ; prooral lobe conical, acute, long as first 

 four .soti}xerous somites; anal tube cylindrical, slightly larger at end 

 than at ba.se, length equal to about eight of the preceding .setigerous 

 somites, truncated end produced into twenty to thirty slender sub- 

 equal pai>ill;e and with a median ventral, annulated cirrus projecting 

 from its orifice about half the length of the entire tube. Setigerous 

 somites fifty, all except the first bearing long, tapering branchi.e dorsal 

 to the seta', which are expanded at the base into an anterior crest or 

 lamella, gradually disapi)earing towards the ai)ex. Set:e more than 

 half the length of the branchi;e, acute and tlattened. First setigerous 

 somite (opposite the mouth) bears a slender cirrus about half as long as 

 the branchia of the following somite; upon the following somite this 

 cirrus gradually decreases in length. Proboscis thick, tongue-sha])ed. 

 Length, .30 millimetres; width, 1.5 milliuietres ; anal tube, I.") milli- 

 metres; branchi;!?, 1 millimetre; breadth of sole, .75 millimetres. 



Common in the sand of '• Spataugoid" Shoal and dredged in channel 

 north of Lewis, Thoroughfare. 



Family TELETnrSID.E. 



ARENICOLA Lamarck. 

 Arenicola cristata Stinipson. 



StimpsoN'. On some remarkable marine invertebrates inhabiting the shores of .South 



Carolina. >Proc. Bost. Soc. Nat. Hist., vol. 5, p. 114, 1856. 

 Wkcstku. Annelida from Bermuda. >Bull.U. S.Nat. Mu.<»., No. 25. 

 QUATRF.F.VGES. Histoiro Nat. des Anneleg, vol. 2. p. (>73. 



This, like the other species Stimpson found at Charleston {Acfctes 

 lupitui), is a very large Annelid, occurring in the greatest abundance in 

 the sand of Bird Shoal, Shark Shoal, etc., and excessively numerous 

 in the muddy creek near Fort Macon. 

 Proc.N. M. in 10 



