MARINE INVERTEBRATA OF GRAND MANAN. 39 







ascertained by comparison of specimens; but the synonymy of this European 

 species is unknown to me, as I have not yet seen the work on Cirripedes by Darwin, 

 in which it is fully elaborated. It occurs abundantly on dead valves of Pect&n, 

 and on stones, in the coralline zone, and it varies greatly in form. 



B. BALANOIDES. Lepas balanoides, Lin. Balanus ovularis, Lam., An. sans vert., 

 v. 660. Gould, Inv. Mass., 17. pi. i. f. 7. B. rugosus, Mont., Gould, 1. c., 16, pi. 

 i. f. 10. Found abundantly, and generally of large size, on the rocks in the littoral 

 zone. Several fine specimens were found attached to living examples of Littorlna 

 littoralis. 



ENTOMOSTRACA. 



CYPRIDINA EXCISA, St., n. s., Fig. 28. This fine entomostracan occurred in con- 

 siderable numbers among nullipores in four or five fathoms. It is about one-tenth 

 of an inch in length, and in shape regularly oval with a deep emargination below 

 anteriorly. Such details as can be observed of the parts protruding from the shell 

 when the animal is in motion are given in the figure. The color is pale yellowish, 

 and sometimes bright pink on the back, from the large round eggs showing through. 



BRANCHIOPODA. 







CUMA BISPINOSA, St., n. s. This species is distinguished from all those of Northern 

 Europe, described by Kroyer in his Tidsskrift, by the short spine-like projec- 

 tions on the carapax, of which there is one on each side, not far behind the large 

 triangular rostrum. In other particulars, it differs but little from the ordinary 

 forms. The tail terminates in a slender stylet, set on the extremity of a thicker 

 one of equal length, from the base of which proceed the long lateral stylets with 

 bifid extremities. The color of the body is brownish ; that of the tail paler or 

 nearly white. Length, 0.45 inch. Dredged in 35 f., gravel, in the Hake Bay. 



ISOPODA. 



IDOT^EA TUFTSII, St., n. s. This species resembles /. caeca, Say, J. A. N. S., i. 

 424, more than any other species, but it differs in the following particulars. It is 

 smaller, being but four-tenths of an inch in length. The eyes are easily seen, and 

 of an opaque-white color in life. The internal antennas are blunt at their tips, and 

 equal in length one-third that of the external ones. The tail is greatly elongated, 

 and regularly sublanceolate. It is of a pale fawn color, with crowded dark brown 

 dots or punctations. It was dredged on a sandy bottom in 10 fathoms, off Cheney's 

 Head. 



I have dedicated this species to Mr. Samuel Tufts, of Lynn, Mass., one of our 

 most active marine zoologists, to whom I have been often indebted for new and 

 curious forms of deep sea animals from Massachusetts Bay. 



I. IRRORATA, M. Edw., Suites a Buffon, Crust. Stenosoma irrorata, Say, J. A. N. 

 S. ; i. 423. Gould, Inv. Mass., 338. This species is found on marine plants about 



