510 



BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



Male. — Cephalothorax in line with the trunk and fused with it or 

 separated by a groove; no dorsal carapace; trunk unsegmented, 

 tapered posteriorly and tipped with two conical caudal rami, which 

 are curved ventrally; no abdomen. Second antennae uncinate; sec- 

 ond maxillae and maxillipeds with stout sickle-shaped claws, some- 

 times forming a chela, sometimes twisted like a corkscrew. A single 

 species within the present area. 



THYSANOTE POMACANTHI Kr0yer 



FiQUEE 300, a 



Thysanote pomacanthi Kr0yer, Naturh. Tidsskrift, ser. 3, vol. 2, p. 288, pi. 15, 

 1863. 



Occurence. — Two females were taken from the gills of the black 

 angel fish {Pomacanth'us arcuatv^), captured near Woods Hole by 

 V. N. Edwards. 



Distribution. — West Indies (Kr0yer). 



Color. — Body a clear milky white, becoming golden-brown in 

 preservatives. 



FiGDRE 300. — a, Thysanote pomacanthi, female, ventral 

 (drawn by M. T. Thompson) ; b, Charopinus hicaudatua, 

 female, lateral ; c, C. Mcaudatus, female, second maxilla 



Female. — Body somewhat narrowed anteriorly and widened pos- 

 teriorly; head tolerably distinctly separated from the thorax, about 

 twice as wide as long. Kemainder of body fused into a trunk three- 

 fourths of the entire length; posterior ramose processes recurved at 

 their tips, close together and forming a sort of skirt, entirely con- 

 cealing the ovisacs. On the posterior margin of each second max- 

 illa are two bundles of filose processes, each containing four biramose 

 threads. First antenna indistinctly 3-segmented; second antenna 



