118 A2irN'UAi:i REPORT. 



GENUS Apus. (Sig. without feet.). 



Bibliographi/ . — Apus, (see above for family.) 



Monoculus, Ldnnceus, Fahricius. 



Binoculus, Geoffroy, Leach. 



Limulus, Muller, Lamat'ck. 



Trilopes, SchranJc, 

 Characters. — / nienniform maxillipeds long; telson squarish. 



GENUS Lepidurus. 



Characters. — Body much shorter than in Apus. First maxillipeds shorter, and 

 a long, spatulate, keeled telson projecting beyond the insertion 

 of the caudal filaments. 

 Query — Should not this be reunited with Apus ? 



TRIBE III. LIMNADIOIDEA. 



Bibliography. — i^pusieus (in part), Edwards 



Characters. — Body covered completely by a carapace which includes abdomen 

 and head; eyes sessile, like Cyproidea in appearance. 



FAMILY LIMNAD^. 



Characters.— Body compressed, with ten to twenty-sevea feet, inclosed in a 

 bivalve shell. 



GENUS Limnetis. 



Characters. — Shell small, round globose, without lines of growth or umbones; 

 feet-bearing segments ten to twelve. ' 



GENUS Limnadelia. 



(Uncertain. The species upon which it was founded are not now known.) 



GENUS Estheria. 



Shell oval, more or less globose, Cyclas-like with numerous lines of growth, 

 amber-colored; animal without a ^^ haftorgan" ; second antennae, with from 

 eleven to seventeen joints to the fiagella; from twenty-five to twenty-seven seg- 

 ments behind the head; feet twenty-four to twenty-eighty anterior feet in the 

 males with clumsy hooks. 



GENUS Limnadia. 



Shell large, with four or five lines of growth, sub-triangular or broadly ovate; 

 animal with a knob-like projection C'haftorgan'''' ) above the eyes; second ante nnse 

 with nine or ten joints to the flagella; ieet eighteen to twenty-six; body m uch 

 smaller than m Estheria. 



