182 LIGUUS CORONA. 



bordered with white on the right side, as though the pigment had been 

 withheld a short time and then poured out copiously. Sometimes all 

 of these markings are sub-obsolete, as in the chestnut-colored speci- 

 men shown in fig. 10 of plate 34. There is almost always more or 

 less green in the cuticle on the latter part of the last whorl, though 

 yellowish-chestnut occasionally replaces it. 



Besides the pattern of coloring described above, more heavily 

 striped shells occur (pi. 33, fig. 6), in which the occasional stripes of 

 the ordinary form are emphasized and multiplied, are either straight 

 or zigzag, and the shell is usually quite large. Fig. 7 of pi. 177 of 

 the ConchologiaSystematica, and fig. 168aof the Conchologia Iconica 

 represent these richly colored specimens, and Dr. Hidalgo, in his 

 excellent volume ou the mollusks of the Spanish Expedition, has de- 

 scribed similar individuals from Napo, Ecuador, collected by Sr. 

 Martinez. As in the ordinary form, there is more or less green on 

 the latter half of the last whorl. 



Fifr. 9 of plate 34 represents a rather small specimen, in which a 

 reddish band, more or less obscured in places by the overlying cuti- 

 cle, revolves above the periphery and just below the articulated dot- 

 band of the spire ; the earlier whorls have broad, angular, brown 

 stripes ; the first half whorl is reddish brown, the succeeding 1-J 

 whorls similar with a white crown. The last whorl is distinctly 

 though obtusely angular in front, and is streaked with bright green 

 cuticle, peculiarly spotted in places with white. This shell may be 

 referable to the form loroisianus, but that seems to be only a weakly 

 marked variety of L. regalis. 



A young shell (pi. 35, fig. 19) has an articulated or dotted band at 

 the rather acutely keeled periphery, another above the middle of the 

 upper surface, and some light and dark streaks below the suture ; 

 just below the periphery there is a continuous dark chestnut band, 

 and two more, separated by a cream-colored space with faint purplish 

 streaks, are upon the base. The peripheral angle is hardly acute 

 enough in the figure. D'Orbigny's pi. 29, fig. 5, shows a similar 

 s\iell. 



Dextral form, (pi. 3Ga, figs. 28, 29; pi. 33, fig. 3).- Similar to 

 the ordinary sinistral type, of which it probably is a mere form rather 

 than a race. The specimens figured on pi. 36a are nearly denuded 

 of cuticle, what remains showing the brownish or yellowish-green 

 tint of the sinistral form. 



