No. 26.] ARTHROSTRACA OF CONNECTICUT. 83 



Monoculodes edwardsi Holmes. 

 1903. Monoculodes edzvardsi, Holmes, Amer. Naturalist, vol. 



Z7, P- 275- 



1905. Monoculodes £dwardsi, Holmes, Bull. U. S. Bur. Fish., 



vol. 24, p. 487. 



Eyes nearly contiguous above and situated in front of base 

 of rostrum, which is triangular and curved downwards. 



First antennse without accessory flagellum, shorter than second 

 pair. 



Mandibles with second joint of palp bent inwards and about 

 as long as third joint. First maxillge with inner plate suboval and 

 bearing two setse at tip; first joint of palp longer than broad, 

 second joint spatulate. Maxillipeds with inner plate small and 

 oblong, not reaching the distal end of first joint of palp; outer 

 plates reaching only a little beyond the middle of the broad second 

 joint of palp. 



First gnathopods with carpal lobe long and distally setose ; 

 propodus oval, with palm evenly convex. Second gnathopods 

 with a slender carpal process which scarcely extends beyond the 

 middle of the palm. Coxal plates unusually small. Anterior 

 pereiopods with carpus prolonged into a long lobe which extends 

 behind the short propodus. Last pair of pereiopods much longer 

 than the preceding, with very long, styliform dactyl. 



Rami of last pair of uropods a little longer than peduncle. 

 Telson oblong and distally rounded. 



Length 9 mm. 



Distribution: Woods Hole, Massachusetts and Newport, 

 Rhode Island. 



PLEUSTID.^. 



Rostrum more or less prominent. Fifth to seventh coxal 

 plates small. 



First antennae without accessory flagellum, longer than second 

 pair ; flagellum in both pairs made up of many segments. 



Mandible with third joint of palp falciform. First maxillae 

 with inner plate small. Maxillipeds with inner and outer plates 

 small and not strongly armed, and with palp long. 



First and second gnathopods often alike, subchelate. Third 

 to fifth pereiopods with basal joint expanded. 



