CRUSTACEA. 5 



THORACOSTRACA. DECAPODA. 



PINNOTHERIDAE. 



Female in the gill-cavity of oysters ; male free-swimming at 

 surface. 



Mass. — From Salem southward. 



R. I. 



Conn. 



11. Pinnotheres maculatus Say. 



Mussel crab. 



Pinnotheres maculatuni Say, Journ. acad. nat. sci. Phil. 

 1818, vol. 1, p. 450. "Inhabits the muricated Pinna of 



OUR COAST." 



Pinnotheres ostreum Smith, Rept. U. S. commr. of fish & 

 fisheries, pt. 1, for 1871-1872 (187B), pi. 1, fig. 2 ((?). 



Female between the gills of Mytilus edulis and Pecten tenui- 

 costatus; male free-swimming at surface. 

 Mass. — From Cape Cod southward, 

 R.I. 



"Conn. 



12. Pinnixa chaetopterana Stimpson. 



Pijinixa cylindrica Stimpson, Ann. lye. nat. hist. N. Y., 

 1869, vol. 7, p. 68. Not/*, cylindrica (Say). 



Pinnixa chaetopterana Stimpson, Ann. lye. nat. hist. N". Y., 

 1860, vol. 7, p. 235. "In the tubes or Chaetopterus perga- 



MENTACEUS, ON MUDDY OR CLAYEY SHORES OF CHARLESTON HaR- 

 BOR, S. C." 



In tubes of annelids, ChaetoxAerus pergamentaceus and Amp>hi- 

 trite ornata. 



Mass. — Wellfleet; Woods Hole; Naushon ; Vineyard Sound; 

 Buzzards Bay. 



Conn. — Noank ; Stony Creek. 



