654 



PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. XXVII. 



Fig. 36.— First 



.\ND SECOND ANTENNA OF 

 TRILINEATA. 



the surroundino- surface, and entirely covered with short conical spines. 

 The three teeth on the posterior l)order of this joint are very long, 

 stout, and acute. The second joint carries on its distal end a papillated 

 area even larger than that on the basal joint. The third and fourth 

 joints are enlarged at their distal ends, and their whole ventral surface 

 is covered with spines and papillse. The terminal joint is tipped with 



two curved claws and a flesh}" 

 "thumb." 



Swimviing legs. — These 

 reach well beyond the edge of 

 the carapace, and the two an- 

 terior pairs have recurved 

 flagella. The distal joints of 

 all four pairs carr}^ a row of 

 j \ /y^ Nv ^:=- plumose setie along their pos- 



ly^ 1 / v^^^^ terior border. The lobes on 



the basal joints of the last pair 

 are small and well rounded. 

 The tactile papillae at the 

 opening of the oviduct are broad and pretty thoroughly fused with 

 the ventral surface of the abdomen. 



Of the chitiu rings in the lateral lobes of the carapace the anterior 

 one is small and egg shaped, and is situated very close to the base of 

 the sucking disks, while the posterior one is large and so broad that 

 its inner border reaches to the 

 bases of the swimming legs. 

 The contrast in the size of these 

 two rings is greater than that of 

 any other species so far exam- 

 ined. The ventral surface of 

 the anterior portion of the cara- 

 pace is covered with triangular 

 spines as large and as numerous 

 as those in am er lean us. 



Nothing could be definitely 

 ascertained with reference to 

 the nervous and reproductive 

 systems without danger of spoil- 

 ing the specimen for a type, and 



therefore the}^ are allowed to pass for the present. Of course the 

 semen receptacles were visible. They prove to be large, spherical, 

 and situated rather far forward. The papillw connected with them 

 are close together on the median line, well concealed beneath the tactile 

 papillae. 



Total length, 4.5 mm.: length of carapace, 8.7 mm.; breadth of 

 carapace, 3.3 mm.; length of abdomen, 1 mm.; breadth, 0.6 mm. 



-Posterior maxii.ijpeds op ARGin.ufi 



TRILINEATA. 



