260 BULLETIN" 15 8, UNITED STATES NATIONAL MUSEUM 



Male. — Body of the same size and proportions as that of the 

 female; first antennae geniculate and considerably swollen, the 

 fourth segment enlarged into the ellipsoidal hand of a sort of chela 

 the dactylus of which is formed by the two terminal segments, which 

 are attached to the posterior surface of the hand a little beyond 

 its center; the terminal segment ends in a short, stout, curved claw. 



The other appendages are like those of the female except the fifth 

 legs, which are greatly reduced in size, the two segments completely 

 fused and very short, the setae small and normal in structure. The 

 part corresponding to the basal expansion carries two equal setae, 

 that representing the distal segment, three setae, the middle one a 

 trifle longer than the others, all five plumose. Total length, 

 0.4r-0.45 mm. 



Remarks. — The chief characteristics of this genus are the long, 

 fl.agellate setae of the second legs and the remarkable structure of 

 the fifth legs in the female. This species is a very poor swimmer 

 and is not so agile as most of the other forms that inhabit the sand. 

 Although thus far found on only one beach, further examination 

 will probably reveal its presence elsewhere. 



GOFFINELLA, new genus 



Body elongate and cylindrical, without demarcation between meta- 

 some and urosome ; head fused with the first segment ; rostrum very 

 large and prominent. Urosome tapered posteriorly, 4-segmented in 

 female, 5-segmented in male; genital segment distinctly subdivided 

 in female; caudal rami short and broadly lamellar, the lateral seta 

 transformed into a long and wide stylet. 



First antennae 8-segmented in female, 9-segmented in male; ex- 

 opod of second antenna minute and 1-segmented; maxilliped strongly 

 developed and uncinate. Endopod of first legs 2-segmented, longer 

 than exopod; the latter and both rami of the three following pairs 

 of legs 3-segmented; both rami of fourth legs with laminate apical 

 processes; fifth legs 2-segmented, setose. Two ovisacs; eggs very 

 large. 



Genotype. — Gofflnella stylifer., new species. 



Remarks. — This genus is very anomalous and must probably be 

 placed in a family by itself. It resembles the Diosaccidae in the 

 double ovisac and the second antennae, but differs radically in the 

 structure of the mouth parts and the swimming legs. It resembles 

 the Canthocamptidae in these latter particulars, but the female car- 

 ries two ovisacs, which would seem to exclude it from that family. 



The genus is named for Robert Goffin, biologist of the United 

 States Bureau of Fisheries, without whose efficient assistance much 

 of the collecting necessary for this paper would have been impossible. 



