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Show 88 DR. W. BAIRD ON THE GEPHYREA. [Feb. 13, Sipunculus verrucosus, Cuvier, Regn. An. 2nd ed. iii. p. 243, 1330 ; Grube, Actin. Echin. und Wttrm. Adriat. p. 44, 1840. Phascolosoma granulatum, Leuckart, Brev. desc. An. quor. p. 22, f. 5, 1838 ; Keferstein, Unters. iib. nied. Seeth. p. 38, 1862 ; Beitr. in I. c. p. 200, 1865. Phascolosomum granulatum, Diesing, Syst. Helm.ii. p. 63, 1851 ; Revis. der Rhyngod. in I. c. p. 759, 1859. Sipunculus (Phymosomum) tuberculatus, Quatrefages, /. c. ii. p. 624, 1865. Hab. Mediterranean, Adriatic ( Blainville, Leuckart), Santa Cruz, West Indies (CErsted). 2. PHASCOLOSOMA GRAYI, Baird. Siphunculus tuberculatus, Gray, Spic. Zool. i. p. 8. no. 4, 1828 (not Blainville, Diet. Sc. Nat. art. Siponcle, 1827). LLab. • ? B.M. The worm described by Blainville under the name of Sipunculus tuberculatus differs considerably from the species described by Dr. Gray under the same name in his ' Spicilegia Zoologica;' and a comparison of Gray's type in the National Collection with De Blain-ville's figure confirms this opinion. In the present species the caudal extremity terminates in a prolonged acuminated point, studded all over with flattened tubercles like warts. The exsertile part of the body is of considerable thickness, and is, like the opposite extremity, also thickly covered with warts. In De Blainville's species the caudal extremity is rounded and blunt, and the anterior or pro-boscidal extremity is much more attenuated than the posterior. The name verrucosus would have been appropriate; but Cuvier has preoccupied that name ; and more lately Hermann Meyer, in the ' Zeitschrift fiir wissenschaft. Zool.' i. p. 268, gives some anatomical details of a species which he considers the Sipunculus verrucosus, but which Diesing states to be the same as the <$. tuberculatus of Blainville. As the species described by Blainville takes precedence by a year of Dr. Gray's, I have named it after this zoologist, who has very well defined the species in his ' Spicileg. Zoolog.' 3. PHASCOLOSOMA ARCUATUM. Sipunculus arcuatus, Gray, Spic. Zool. i. p. 8. no. 5, 1828. Hab. India (General Hardwicke's Collection). B.M. 4. PHASCOLOSOMA JEFFREYSII, sp. nov. Corpus attenuatum, fusiforme, maculis rubris in dorso notatum, striis circularibus transverse cinctum, in medio sparse granulatum, et antice dense granulatum, granulis brunneis; pars exsertilis sparse granulata et in dorso rubro cincta; tentaculis retractis. Long.corp. 14 lin.,proboscistertiam partem corpori sequans; crass. corp. 1-| lin., proboscidis h lin. Hab. Spezzia (J. G. Jeffreys, Esq.). B.M. The body of this worm is narrow and cylindrically fusiform in |