262 PROCEEDINGS OF THE NATIONAL MUSEUM vol. in 



and an acute distal tooth. Relative lengths of the setae, numbered 

 proximal to distal: 5^3>2=4^1. 



Male. — Urosome segments 3, 4, and 5 finely serrate on ventral 

 margins, smooth on dorsal and lateral margins. Al with setal arma- 

 ture shown in figure 15d. Terminal segment claw-shaped, bearing 2 

 setae and 2 aesthetascs. Penultimate segment subrectangular, bear- 

 ing long plump aesthetasc. Antepenultimate segment with aesthetasc 

 about as long but thinner than that on penultimate segment. Pi as 

 in female. P2 without reduction in number of setae on Ri3 ; apex of 

 Ri produced into short spiniform process posterior to the 3 large 

 terminal setae. Ri2 of P4 in addition to large distal seta with very 

 fine seta inserted on posterior surface near inner margin at about 

 middle of margin. 



P5 much smaller than in female. Re about 1.25 times as long as 

 wide, bearing 6 setae of relative lengths shown in figure 16c. P6 

 consisting of broad flap bearing outer long slender seta, middle 

 heavier seta, and inner short spiniform seta. 



Distribution. — Vicinity of Helgoland (Klie) ; Bad St. Peter, on 

 west coast of Schleswig-Holstein, West Germany (Noodt); ?Gulf of 

 Naples, Italy (Pesta) ; Woods Hole, Mass. (Fish) ; Marthas Vineyard, 

 Mass. (Wilson) ; Narragansett Bay, R.I. (Williams) ; off Fort Myers, 

 Fla. (King) ; Big Pine Key, Fla. (Yeatman, in litt.) ; Bahla Fosfores- 

 cente, Puerto Rico (this paper) ; St. Johns, Antigua (this paper) ; 

 Marigot Bay, St. Lucia (this paper) ; Progresso, Yucatan, Mexico 

 (this paper). 



Remarks. — The Puerto Rican specimens agree in all particulars 

 with Klie's description, except that Klie found Re of A2 to be 7- 

 segmented while in our specimens it is 6-segmented. We believe that 

 Klie's subspecies should be given specific rank. L. minor and L. 

 helgolandica are probably to some extent sympatric, as Klie (1949, 

 p. 100) indicates, and evidence of intergradation is nonexistent. We 

 consider that the differences between L. minor and L. helgolandica are 

 of about the same magnitude as the differences between other species 

 of Longipedia. 



All published North American records of Longipedia appear to be 

 referable to L. helgolandica. Wilson's (1932) specimens of L. coronata 

 from Katama Bay, Marthas Vineyard, Mass., which are deposited in 

 the U.S. National Museum, closely resemble the Puerto Rican speci- 

 mens. We have also identified specimens from Marigot Bay, Saint 

 Lucia, taken in a plankton tow during the 1959 Smithsonian-Bredin 

 Expedition to the West Indies. Dr. Harry C. Yeatman (in litt.) has 

 collected specimens of a Longipedia from Big Pine Key, Fla., which he 

 believes to be conspecific with the Puerto Rican species. 



