No.415.] MORTH-AMERICAN INVERTEBRATES. 593 
mature specimens about one inch in long diameter and about half as broad. 
Reported from Baffins Bay, Massachusetts aed Nahant, A. Ag.; Newport 
Harbor, iat, Mayer. 
Gonionemus murbachit Mayer. (Fic. 60). 
Medusa with low hemispherical bell when in repose, but subconical when 
in active motion and contraction ; radial canals four, prominent and with 
Fic. 60. — Gonionemus murbachi? M ayer. 
Fic. 61. — Persa incolorata McCr. (Modified from McCrady.) 
often are bent at a sharp ails ; manubrium of moderate size, quadrate in 
form and with prominent frilled oral lobes ; gonads suspended in sinuous 
folds beneath the radial canals ; otocysts present in variable numbers and 
disposed between the bases of the tentacles. 
Persa incolorata McCr. (Fic. 61). 
Bell thimble-shaped, walls thin, the entire medusa colorless except the 
pale yellowish gonads, which are oval and attached to the walls of two 
opposite radial canals, of which there are eight, only two of which are very 
definite ; margin of the bell devoid of tentacles, but nodulated by the 
presence of batteries of nematocysts. 
(Condensed from McCrady’s account, Gymn. Charl. Harb., p. 104.) 
Liriope scutigera McCr. 
Described by McCrady (of. cit., p. 106) from Charleston Harbor, and 
noted by Mayer from Florida (Bull. Mus. Comp. ZoóL, Vol. XXXVII, 
No. 2, p. 64). Also from N ewport Harbor, by latter observer. 
