182 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



smoothish. Branchiae nine, rather long, lanceolate, with slender, naked 

 tips and numerous lateral processes. Operculum elongated obconic. 

 hollow, containing the eggs ; pedicel slender at base, enlarging gradu- 

 ally to the operculum. 



Massachusetts Bay to Nova Scotia, common, in 10 to 80 fathoms, on 

 shells and stones. 



Tomopteris Smithii, sp. dov. 



A large and very elegant species, remarkablytransparent and exceed- 

 ingly active in its motions. Outline, including lateral appendages, elon- 

 gated oval or lanceolate, the length being about three and one-half 

 limes the breadth. Head with two small eyes, near together ; two short, 

 tapering, acute antennfB, and two very long and slender cirriform pro- 

 cesses, nearly half as long as the body; these originate from broad 

 subconical bases. The lateral appendages of the body commence close 

 to the head; the first are about equal to the diameter of the body, 

 but those at about the anterior third are twice as long, while the poste- 

 rior ones become very small and more distant ; the tail ends in a nar- 

 row, naked portion, of considerable length. The lateral appendages 

 taper from the base to the fork, where they divide into two lobes, each 

 consisting of a broad, elliptical, and very thin membrane, supported by 

 an acute central branch of the main stem. The naked caudal portion 

 in one specimen had about six faint bands of reddish, not seen in the 

 other ; aU other parts are so limpid as to be nearly invisible in clear water. 

 The interior of the body and appendages contained numerous eggs. 

 Length, 63™" and 70™"^; breadth across appendages, IS™""; length of 

 middle appendages, 7™™ ; of long cephalic appendages, 29°"^. 



Eastport, Me., August, 1872, two specimens, at surface. Named in 

 honor of Professor S. I. Smith, who first discovered it. 



GEPHYRiEA. 

 Priapulus pygmaeus, sp. iiov. 



A small yellowish white or flesh-colored species. In extension the pro- 

 boscis is usually slightly clavate, nearly as long as the body, and often 

 somewhat greater in diameter. The proboscis is distinctly longitudmally 

 marked with about twenty-five white, muscular liues, between which 

 there are as many rows of small, prominent, conical papillae, largest 

 toward the mouth and disappearing on the posterior third. Body usu- 

 ally cylindrical, changeable, abruptly tapered or subtruncate at the pos- 

 terior end, distinctly annulated, with fine circular and longitudinal lines 

 on the annulations ; at the posterior end having very small conical pa- 

 pillse on the annulations. Caudal appendage in length about equal to 

 diameter of body, with a rather stout stem, bearing about twelve sliort. 

 fusiform papillae or branches, which are changeable in form, and covered 

 with small conical papillae. T'he integument is so translucent that the 

 corpusculated circulating fluid can be easily seen circulating in the 

 hollow, stem and tubercles. The corpuscles are minute and round. 



