ORDER BRANCHIOPODA — BRANCHIPUS 63 



ORDER IX. BRANCHIOPODA. 



Body often minute, ivith a subcrustaceous covering. Two pedunculated eyes. Feet solely 

 adapted for swimming, and supporting the branchial apparatus. 



GENUS BRANCHIPUS. Latreille. 



Body elongated, soft, transparent, divided into eleven segments. Tail of six to nine seg- 

 ments, long, subcylindrical, gradually diminishing and terminating in two ciliated fins. 

 Feet lamellar, of twelve pairs. Antennas two or four, setaceous. Two compound pedun- 

 culated eyes. Two movable horns on the front, forked at the tips. Mouth presenting a 

 beak-shaped papilla, and four small lateral pieces. Stagnant pools of fresh water. 



Branohipus stagnalis. 



PLATE IX. FIG. 36. 



Cancer stagnalis, LlN. Gammarus id. Fab. Systi Vol. 2, p. 518. 

 Branchipus stagnalis. Desm. Considerations, &c. p. 389, pi. 56, figs. 2-5. 

 Branohipus stagnalis. Gould, Invertebrata of Mass. p. 339. 



Description. Horns of the male horizontal ; terminal caudal fins broad. Antennas four. 

 Length one inch. 



According to Dr. Gould, this species is common in most of our stagnant pools. I have not 

 studied it carefully, and have introduced a foreign figure to illustrate the species. 



