218 Zoological Society. 



1. Branchipus pisciformis, Schaeffer. Antennis inferioribus 

 maris magnis, compressis, apice bifurcatis; appendicibus anten- 

 niformibus filiformibus prcelongis ; front e prolongato, bisulco. 

 Long. \ poll. 



Syn. Apus pisciformis, Schaeffer, Der Fisch-form. Kiefenfuss, etc. 

 t. 5! f. 1-11 (1752). 



Cancer stagnalis, Linnaeus, Syst. Nat. edit. 10. 634 (1/58) ; Faun. 

 Suec. ed. 2. 497. No. 2043 (1761); Fabricius, Ent. Syst. ii. 518. 

 No. 11; Mantiss. i. 335. No. 10; Miiller, Zool. Dan. Prodrom. 

 2351 ; O. Fabricius, Faun. Greenland. 247. No. 224. 



Branchipus pisciformis, Schaeffer, Element. Entomol. t. 29. f. 6, 7 

 (1766). 



Gammarus stagnalis, Fabricius, Syst. Entoin. 419. No. 5. 

 Cancer (Gammarellus) stagnalis, Herbst, Krabben und Krebse, 

 ii. 121. No. 66. t. 35. f. 8-10 (1796). 



Branchiopoda stagnalis, Lamarck, Syst. An. s. Vert. 161; Latreille, 

 Hist. Nat. Crust, iv. 319. t. 36, 37 ; Gen. Crust, i. 22 ; Bosc, Man. 

 d'Hist. Nat. Crust, ii. 234. 



Branchipus stagnalis, Latreille, Enc. Me'th. t. 336. f. 14-16 ; 

 Regne Anim. iv. 174 ; Leacb, Diet. Sc. Nat. xiv. 542 ; Edin. Encyc. 

 vii. 384 ; Desmarest, Cons. gen. Crust. 389 ; Lamarck, Hist. An. s. 

 Vert. v. 133; M. Edwards, Hist. Nat. Crust, iii. 367; Regn. An. 

 ed. Crochart, t. 74. f. 2. 



Branchipus Schcefferi, Fischer de Waldheim, Bull. Soc. Imp. 

 Moscou, vii. (1834) ; Thompson, Zool. Research, fasc. v. t. 3. f. 1-3 

 (1834). 



Branchipus melanurusl Koch, Deutsch. Crust. H. 35. t. 2. 

 Ino stagnalis I Oken, Lehrb. der Naturg. iii. 399. 

 Larva aquatica, Linn. Faun. Suec. ed. 1. 358. No. 1357. 

 Hab. In vicinitate urbis Ratisbonae ; Schcefer. In vicinitate urbis 

 Paris ; M. Edwards. 



This species according to Schaeffer' s description is half an inch 

 long, about the thickness of a straw, and semipellucid. The male is 

 generally of a pale red or flesh colour, though sometimes varying be- 

 tween vermilion and orange. The female is of a dull green, with the 

 ovaries generally of a bright blue. The inferior antennae of the male 

 are large organs, somewhat flattened in shape, broad at the base, 

 toothed at about two-thirds of their length on the external edge, and 

 becoming narrower near the extremity, which presents an appearance 

 as if somewhat bifurcated. Those of the female are much shorter, 

 cylindrical, and pointed at the extremity. The two antenuiform 

 appendages arising from near the base of these organs in the male 

 are of considerable length, longer than the antennae themselves, and 

 filiform. The front of the head is prolonged into a prominence 

 which is cleft down the centre and forked. The feet are long, com- 

 posed of three joints, all of which are nearly of equal size, and have 

 their edges beset with numerous short hairs or setae, which when 

 magnified j re finely plumose. The caudal fins are of considerable 

 size, flat and plumose. The male organs are slender and rather long. 



