1360 



CRUSTACEA. 



lete articulation. The apical angles are cut off in a very slightly 

 oblique direction. The stylets are narrow oblong, and the setae but 

 little longer than the stylets. 



The posterior antennae are slender, and the recurved part is nearly 

 half the length of the joint. The large spine exterior to its base is 

 nearly straight and slender. The maxillae have the inner prong 

 longest; the outer has a short spine on the outer margin. 



The first pair of natatories has a small appendage to first joint near 

 inner apex. The apron is smaller than in the true Caligi, and has 

 larger appendages. The fourth pair resembles the second. The 

 external ovarian tubes of specimen examined, were about as long as 

 whole abdomen. The first abdominal segment is broad concave behind, 

 with the posterior angles widely rounded. 



Genus CALIGERIA, Dana. 



Caligo similis. Cephalothorax 2-articulatus, discis suctoriis carens, seg- 

 mento postico bi-alato. Pedes postici biramei, setis brevibus, non plvr 

 mosis. 



Near Caligus. Cephalothorax two-jointed, without disks for attach- 

 ment, posterior segment bi-alate. Posterior feet two-branched, setae 

 short and not plumose. 



This genus is also near Caligus, but differs in its two-branched pos- 

 terior feet, and alate posterior thoracic segment. In this last cha- 

 racter it shows a transition to the Pandarus. It has the maxillae, 

 furcula, and stout obtuse buccal trunk of Caligus. There were no 

 sucker disks in the species seen. The eyes were united on a single 

 spot of pigment. The caudal setae were peculiar in being short and 

 stout, and not plumose. 



CALIGERIA BELLA. 



Feminae: — Cephalothorax rotundatus, discis suctatoriis nullis. teg- 

 mentum secundum transversum, ad angulos posticos alatum, alis latis, 

 approximatis, margine toto arcuato. Abdomen 3-articulatum, seg- 



