r 
590 MOLLUSCA. 
The following seem to be individual variations in colour, rather than geographical 
varieties of WV. picta; but as they have been distinguished and named by K. Miller, 
we may mention them here :— 
Var. luteofasciata. 
Neritina picta, v. Mart. loc. cit. figg. 24, 257. 
Neritina picta, var. y. luteofasciata, Miller, loc. cit. p. 168”. 
Near the suture and in a spiral zone lower down grey, the intervening space yellow, the grey and yellow 
portions each marked with the characteristic white or bluish black-bordered lines. 
Hab, N.W. Mexico, Mazatlan (coll. Dunker); Panama (coll. Paetel).—Ecuapor, 
Guayaquil (Wolf ). 
Var. nigrofasciata. 
Neritina picta, var. with black sutural band, Carpenter, loc. cit. p. 261». 
Neritina picta, var. e. nigrofasciata, Miller, loc. cit. p. 168”°. 
With one or two black spiral bands, the upper one near the suture, the other in the lower half of the last 
whorl; the intervening space with the characteristic lines. 
Hab. N.W. Mexico, Mazatlan (eigen, coll. Dunker) ; Panama (coll. Paetel).—Ecuapor, 
Guayaquil (Wolf). 
Var, guttata. 
Neritina picta, var. 8. gutiata, Miller, loc. cit. p. 168”. 
The streaks reduced to small spots. 
Hab. Costa Rica (Pettier).—Ecuapor, Guayaquil (Wolf); Peru, Payta (Philippi). 
Var. serta,n. (Tab. XXVIII. fig. 13.) 
With white, black-bordered small spots in two or three spiral zones, otherwise uniformly yellowish. 
Hab. N.W. Mexico, Mazatlan (coll. Dunker); Costa Rica (v. Seebach) ; Panama (coll. 
Paetel).—Ecuapor, Guayaquil (Wolf); Peru, Payta (Philippi). 
Var. subnigra, n. 
Almost uniformly black on the dorsal face. 
Hab. Costa Rica (Seebach, Pittier)—Fctapor, Guayaquil (Wolf). 
The columellar margin is not so conspicuously sinuated in its middle part as in most 
other species of the subgenus Cléthon, but it has also a smaller number of teeth, 
ordinarily seven, and the two apophyses of the operculum are united by a septum-like 
wall. | 
This species seems to be truly marine. C. B. Adams ® states that he has found it 
on wood and stones, as well as on moss-like weed, at marshy spots between high and 
low water, and he calls it “strictly marine.” Cuming is said! to have collected it 
in abundance on a mud-bank covered at times with fresh water. Miller 13 says that 
