EASTERN COAST OF THE UNITED STATES. 



29 



Edwardsia sulcata Verrill. 



The column is long, smooth, with twelve strong sulcations ; the intermediate spaces 

 swollen into prominent ribs, which are crossed by slight, transverse wrinkles ; upper part 

 in contraction thickest, tapering below. Naked basal portion distended, rounded, with a 

 small, concave, smooth area at the end, the sides marked with twelve lines which do not 

 meet in a point, but disappear on the small terminal convex area, which, however, is 

 scarcely distinct from the sides. Tentacles not observed. 



Color light yellowish brown. Length in contraction, 1.25 inches; diameter, .30. 



Chelsea Beach, Mass., thrown up after a storm. 



Never having seen this species except when contracted in alcohol, I am able to give 

 but a very imperfect description. It differs widely from the other species in the character 

 of the column. From K sipunculoides it may readily be distinguished by its larger size and 

 less slender form, by its much smoother surface and lighter color, and by the twelve sul- 

 cations instead of eight. 



For a fine specimen of this species, and the first that I had seen, I am indebted to Mr. 

 A. S. Packard, Jr., who found it in the spring of 1862 ; but Dr. Stimpson informs me that 

 he has also obtained the same species at Chelsea. 



Genus Halcampa Gosse. 



Actinia (pars) Peach, in Johnston's British Zoophytes. Pcachia (pars) Gosse, Trans. Linn. 

 Soc, xxi. p. 271 (1855). Halcampa Gosse, Ann. and Mag. of Nat. Hist., 3d series, i. p. 418 

 (1858). 



Column very contractile, much elongated and slender in expansion, occupying holes in 

 the earth or among rocks ; in contraction irregularly cylindrical, often with constrictions ; 

 walls membranous throughout, diaphanous, the upper portion provided with well-developed 

 suckers. Base capable of being enlarged and greatly distended, without a distinct disk, but 

 capable of adhering slightly by its surface to foreign bodies, apparently imperforate. Ten- 

 tacles short, in two or three cycles, the last usually imperfect in some of the systems, 

 whole number not known to exceed twenty. The internal lamella? are very thin next the 

 wall, but near the middle have a very strong, longitudinal, muscular thickening, which 

 narrows both above and below. Ovaries very large, extending about half way to the base. 

 The peripheral pores of the lamellas are large and well defined. 



Halcampa albida Agassiz, MS. 

 Corynadis albida Agassiz, Proceedings of the Boston Society of Natural History, vol. vii. p. 24 (1859). 



Body very changeable in form, sometimes very long, slender, and attenuated ; at other 

 times short cylindrical or clavate ; not unfrequently forming two distinct portions sepa- 

 rated by a constriction in the middle, the parts above and below being of the same size, or 

 the upper one may be distended while the lower is contracted and slender ; in extreme con- 

 traction short, oval, rounded at both ends, but the basal end smallest. The base may be 

 expanded into a thin, transparent, bladder-like form, or by contraction become pointed. 

 Surface of the column smooth below, diaphanous, marked faintly by the longitudinal and 

 transverse muscular fibres, and deeply by twenty sulcations corresponding to the internal 



MEMOIRS BOST. SOC. NAT. HIST. Vol. I. 8 



