REPORT OF COMMISSIONERS OF INLAND FISHERIES. 73 



11 o t h res. Two species, P. chsetopterana and P . S a y - 

 ana, while not recorded for Rliode Island, may be expected to be 

 found occasionally. 



PinnLxa chaetopterana Stimpson. 



Plate V. Figure 23. 

 P. cylindrica Stimpson. Verrill and Smith, 1874. 



This species answers to the general description of the genus. The 

 propod (next to the last distal segment) of the third walking leg is 

 as broad as long, or nearly so. 



Habitat: in the tubes of the annelids, Chsetopterous and Amphi- 

 trite. 



Distribution: Cape Cod to North Carolina. 



Pinnixa sayana Stimpson. 



Plate IV. Figure 21. 



P. cylindrica Smith. Verrill and Smith, 1874. (Given as P. cylindrica Say, 

 but later corrected by Mr. Smith). 



P . sayana differs from P. chaetopterana in having the 

 propod of the third leg distinctly longer than broad. 

 Habitat: in the tubes of large annelids. 

 Distribution: Cape Cod to North Carolina. 



(Genus) PINNOTHERES Latreille. 



Pinnotheres differs from Pinnixa in having a rounded 

 carapace, and in that the third leg is about the same length as the 

 others. It is represented by two species, P. ostreum and P . 

 maculatus. In both of these species it is worthy of note that 

 the females live in the gill chamber of certain mollusks, the former 

 in the chamber of the oyster, the latter in the chamber of the mussel 

 and scallop, while the males are free-swimming. 



