708 PROCEEDINGS OF THE XATIOXAL MUSEUM. vol.47. 



First antennae four-jointed and tapered to a sharp point; second 

 antennae biramose and bent down across the frontal margin, with the 

 tips overlapping, the exopod (ventral ramus) much smaller than the 

 endopod and indistinctly two-jointed, the endopod bilobed at the tip 

 and armed with tiny spines. 



Mouth tube broad at the base and long enough to overlap the tips 

 of the second antennae. First maxillae bipartite, palp short and 

 stout and armed with a single spine; second maxillae short, held at 

 right angles to the body axis, and separate to the very tip, where they 

 are attached to a large spherical bulla; maxillipeds with a stout basal 

 joint and a slender terminal claw, armed on its inner margin near the 

 tip with a secondary claw; these maxillipeds are attached so far for- 

 ward that they almost reach to the frontal margin of the head. 



Color (preserved material), a dark ycllowish-browm. 



Cephalothorax, 2.15 mm. long, 2 mm. mde, 1.25 mm. thick. Sec- 

 ond maxiUae, 1.75 mm. long. Ventral posterior processes, 4.33 mm. 

 long. Egg strings, 5 mm. long. 



Specific characters of male. — Cephalothorax smaU and separated 

 from the trunli by a short waist; head covered with a dorsal carapace; 

 trunk spindle-shaped, ending posteriorly in a long conical genital 

 process; no anal laminae. First antennae four-jointed, joints sub- 

 equal; second antennae biramose, endoped well rounded and armed 

 with a single spine, exopod two-jointed and carrying a terminal tuft 

 of setae. First maxillae Avith a two-parted tip and a small palp, 

 armed with a single spine; second maxillae remarkably long and 

 slender, over twdce the length of the maxillipeds, the terminal claw 

 slender, with a bluntly rounded pad at its base. Maxillipeds triangu- 

 lar and stout. 



Color, the same as that of the female. 



Total length, 1.35 mm. Greatest width, 0.35 mm. 



{elegans, elegant or neat in appearance.) 



llemarlcs. — This species was first named by Richiardi mthout any 

 description or figure. It was afterwards identified by Brian, who de- 

 scribed the female briefly and illustrated it -with a single text figure. 

 There is no doubt that these Woods Hole specimens belong to the 

 same species that Brian figured; whether they are identical mth 

 Richiardi's named species can not, of course, be determined with cer- 

 tainty, but, since Brian's and Richiardi's specimens came from the 

 same locality and host, there is a strong presumption that they are 

 identical. A full description, with figures of both sexes, is here pub- 

 lished for the first time. 



The species closely resembles Heller's B. insidiosa, but differs in 

 several important particulars, notably in the relative lengths of the 

 two pairs of posterior processes, in the bilobed exopod of the second 

 antennae, and in the position of the maxillipeds relative to the other 



