650 PROCEEDINGS OF THE NATIONAL MUSEUM. tol.47. 



base of the mouth tube and looking like an under jaw in side view; 

 second maxillae removed a long distance behind them, sometimes 

 fused, sometimes separate, usually with a bulla; maxillary glands as 

 external swellings at the base of these maxillae. 



Subfamily characters of male. — Cephalothorax fused with the trunk, 

 with no traces of segmentation; no anal laminae or only very minute 

 ones; second antennae biramose, but without a claw; in BracMella 

 and its relatives the cephalothorax and trunk are in the same lino or 

 the body is somewhat curved; in Clavella and its relatives the body 

 is folded together ventrally with no distinction of cephalothorax and 

 trunk. 



Remarlis. — This subfamily is considerably the largest of the four 

 and includes all the more degenerate genera. Since it has also been 

 the least well known and has served as a sort of wastebasket to catch 

 such forms as could not readily be located elsewhere, more changes 

 have been necessary and a much larger number of new genera have 

 been introduced. The figures and the diagnoses given, however, will 

 readily prove the validity of these genera, which are largely due to 

 the differential characters of the males, here for the first time pre- 

 sented. 



Genus THYSANOTE Kr0yer. 



Generic characters of female. — Cephalothorax in Hne with the trunk, 

 short, thickset, flattened dorso-ventrally, and completely fused with 

 the trunk or only imperfectly separated; trunk unsegmented, flat- 

 tened like the cephalothorax, with no genital process, abdomen, or 

 anal laminae; a pair of fingerlike posterior processes ventral to the 

 egg strings; branched or unbranched fimbriate processes attached to 

 the posterior margin of the second maxillae, to the body at the base 

 of the second maxillae, and to the posterior comers of the trunk, 

 sometimes hiding the egg strings. First antennae indistinctly seg- 

 mented; second antennae biramose; first maxillae large, tripartite; 

 second maxillae united only at their tips, bulla mushroom-shaped; 

 maxiUipeds large and powerful; egg strings usually short and stout. 



Generic characters of male. — Cephalothorax in line with trunk axis, 

 the two curved into a quarter moon and separated by a distinct 

 groove; no dorsal carapace; trunk spmdle-shaped, unsegmented, and 

 terminated by two conical anal laminae, which are curved ventrally; 

 mouth- tube and appendages at right angles to the body axis; second 

 antennae uncinate; second maxillae and maxillipeds with stout 

 sickle-shaped claws, one or both of them sometimes twisted like a 

 corkscrew. 



Type. — Thysanote pomacanthi Kr0yer. 



{Thysanote, duaavoc, a fringe, alluding to the fimbriate processes.) 



RemarJcs. — This genus may be recognized at once by the fimbriate 

 processes, whose dense fringe causes some of the species to bear a 



