98 ANNUAL REPORT. 



FAMILY 1. PENiLiD^. Dana. 



Bibliography. — Penilidae, Dana. Pro. Amer. Acad. Sci., ii., 47, 1849. 

 Sidina, Baird, Brit. Entoniost, 106. 

 Sididse, Gray, Cat. Brit. Crust. Brit. Mus., 93, 1850. 

 Characters. — Foliaceous feet twelve, narrow. Anterior antennae obsolescent. 



Genus 1. Sida, Straus. Posterior antennae with the longer ramus 



three- articulate, shorter, two- articulate. Head not beaked below. 

 Genus 2. Daphnella, Baird. Both rami of posterior antennae two- 

 jomted. Anterior antennae borne by the middle of the under aspect 

 of the head. 

 Genus 3. Penilia, Dana. Both rami of the posterior antennae two- 

 jointed. Head short, produced below. Primary antennae borne on 

 the extremity. Species marine. 

 ? Genus 4. Latona, Strauss. Posterior antennae having three one- 

 articulate rami. 

 Only one species of this family has been met with, which is here described. 



Genus 1. 



Sida, (Straus.) 



Bibliography. — Sida, Straus, Minn. Mus. Hist. Nat., v. 



M. Edivards, • 



Baird. 



Dana. 



Daphnia, MuUler, 



Latreille, etc. 



Monoculus, De Geer. 



Jurine, etc. 



Generic Characters. — Superior antennae of moderate size. Longer rami of infer- 

 ior antennae with three articulations, shorter rami with two. 



Inferior antennae yery large and powerful. 



Sida crystallina, Muller. 



Bibliography. — Daphne crystallina, Muller, Zool, Dan. Prod., No. 2,405, 1,776. 

 Daphnia crystallina, Muller, Entomost., 96, t. 14, f. 1-4. 



Latreille, Hist. Nat. Crust. 17., 230. 



jlosc, Minn. d'Hist. Nat. Crust. II., 281. 



Sida crystallina, Straus, Minn. Mus. Hist. Nat., V. 

 Sida crystallina, M. Edwards, Hist. Nat. Crust., III., 383. 

 Monoculus crystallina, Gmelin, Linn. Lyst. Nat., edit. 13th, I. 



3,000, No. 29. 



Manuel, Enc. Mith., VII. 724, t. 265, 



f. 15-18. 



Fahricius, Ent. Syst., II. 493. 



Monoculus elongatus, De Geer, Mem. Servis Hist. Ins., VII. 470, 



t. 29, f. 1^, 1,778. 



