36o REPORT OF NEW JERSEY STATE MUSEUM. 



Creek near Mantua. In Delaware it is frequently found, and I 

 obtained it at Laurel, in Sussex county, and Brown's Branch 

 near Harrington. Mr. S. N. Rhoads obtained it in the same 

 state at Med ford Mills. In Maryland I have found it in tribu- 

 taries of the Choptank near Denton. 



Super-Family THALASSINIDEA. 



Last segment of narrow thoracic sternum movable and inde- 

 pendent. Abdominal terga overlap one another hardly or not at 

 all. Rostrum small and triangular, or rudimentary. Carapace 

 not fused with epistome or in any way overlapped by first ab- 

 dominal tergimi. Antennal peduncle of five movable joints and 

 supports lash-like flagellum. Telson usually subcjuadrangular, 

 and first abdominal somite usually carries pair of uniramous ap- 

 pendages. 



A single family in our limits. 



Family UPOGEBID.E. 



Carapace short, not overlapping first abdominal tergum. Ros- 

 trum short, triangular or rudimentary. Last thoracic somite 

 movable and last thoracic sternum separate. Abdominal terga, 

 which more or less unequal in size, hardly overlap one another, 

 and pleura rudimentary or absent. Telson usually subquadrate 

 and caudal swimmerets usually foliaceous. Two antennular 

 flagella of no great length. Antennal peduncle five-jointed and 

 flagellum lash-like. No antennal scale. External maxillipeds 

 pediform. Thoracic legs seven-jointed, but no independent 

 movement between basis and ischium. First or first and second 

 pairs chelate, or first pair subchelate and second pair monodacty- 

 lous. Third and fourth pairs monodactylous, but fifth pair sub- 

 chelate or even imperfectly chelate. Branchise thoracic. 



Genus UPOGEBIA Leach. 



Eupogebia Leach, Edinburgh Encyclop..^ VII, 1813, p. 400. Type Cancer 

 (Astacus) stellatus Montagu, monotypic. (Not consuUed.) 



VLeach, 1. c, Am. Ed., VII, 1815, p. 239.) 



