MEDUSAE CRASPEDOTAE. 13 



1850, new ser., vol. 4, p. 308, pi. 7. A. Agassiz, Mem. Mus. comp. 

 zool., 1865, vol. 1, no. 2, p. 136, figs. 215a, 216a-219. 



Abundant north of Cape Cod, occasional in spring off southern 

 New England. 



Me. — Grand Manan, Eastport, summer; off Casco Bay, July. 

 Mass. — Boston Harbor, Nahant, April to July, Cape Cod, 

 Vineyard Sound, Woods Hole. 

 Gulf of Maine; German Bank; Piatt's Bank. 



35. Ptychogena lactea A. Agassiz. 



A. Agassiz, Mem. Mus. comp. zool., 1865, vol. 1, no. 2, p. 137, 

 fig. 220-224. "Massachusetts Bay, Nahant." 

 A boreal species not known south of Cape Cod. 



Mass. — Nahant. 



^ MITROCOMIDAE. 



36. Halopsis ocellata A. Agassiz. 



A. Agassiz, Proc. Boston soc. nat. hist., 1863, vol. 9, p. 220. 

 "Nahant." Mem. Mus. comp. zo51., 1865, vol. 1, no. 2, p. 99, 

 fig. 143-150. 



Not recorded south of Cape Cod. 



Me. — Grand Manan. 

 ' Mass. — Massachusetts Bay, Nahant. 

 Gulf of Maine, off Casco Bay. 



37. TiAROPSis DiADEMATA L. Agassiz. 



L. Agassiz, Mem. Amer. acad. arts and sci., 1850, new ser., vol. 4, 

 p. 298, pi. 6, fig. 1-18; pi. 8, fig. 11. "Along the wharves of 

 Boston harbour." L. Agassiz, Contr. nat. hist. U. S., 1862, vol. 4, 

 p. 308, pi. 31, fig. 9-15. 



Boreal, common on the northern New England coast March to 

 May; occasional south of Cape Cod. 



