^ ARIATION AND ZOOGEOGRAPHY OF LIGUUS IN FLORIDA. 463 



Color-forms. 



L. solidus occurs in four conspicuously di 



color-fo 



HE 



as follows : 



with 



Without 

 brown 



markings. 



suture, periphery and base, broad 

 yellow areas between them; upper 

 whorls and mouth white. (Form sol- 

 idus Say.) PI. XXXVII, fig. 16. 



III. Shell white with yellow bands si 



suture and base, and t wo con guout 



ones at the periphery; apes ted 



aperture white. (Form •oliduluf 

 Pita.) PI. XX: VI fig. 2a. 



I 



II 



as above, but a brown IV. Brown blotchei disposed in series 



line divides the peripheral white 



Having 



brown 



marking 



suture 



Yellow zone traversed by dark fin met 

 on the spire, persisting 



as 



_ r _ts on the last whorl. 



Apex and columella pink. (Form 

 aravhicus Pils.) PI. XXXVII , fig. 1, lo. 



occupy tin positions of the yellow 



bends described above, a brown line 

 running between the tw cont 

 peripheral spot-bends. The rest of 

 the lest t > whorls is yellowish ; apex 



pink; some dark flames, chid! n 

 t heBpirc. (Form pictus K ve.), fip 



It will be noticed that forms I and III are albinistic, differing from II and I\ 



1 actively by lacking dark 



markings, and in no other r< p<< t 



Th<>\ 



in 



colonies of the colored forms 



d 



sm al 1 



Tli 



lead to the conclusion that no dark pattern is recessive to dark pattern. 



The form no. II, which I have called form graphicus(PLXX.XV\\.i\fr. 1, la) 

 has apparently a more primitive color-pattern than the others, the flame-painting 

 of the neanic whorls resembling that of Cuban forms of Liguus, and conforming 

 to the fundamental pattern characteristic of Oxystyh, Orlhalicus and their South 

 American allies of the same subfamily. The flame pattern has tx a accelerated 

 to extend upon the last embryonic whorl, and it has been largely lost on the last 

 whorl, or reduced to series of blotches forming bands bordering the peripheral 

 white belt. The decadence of dark pattern on the last whorl or two, leaving 



it fully developed only 



ly youth, indicates that evolution is in progress 



towards a shell with spiral bands of white, yellow and brown, but no axial 



markings. 



As form II, graphicus, has been found on several of the keys inhabited b> the 

 species, and 86 per cent of the shells seen are of that pattern, it is evidently the 

 dominant form. It is also the oldest pattern phylogenetically. 



Form I, solidus (PL XXXVII, fig. 16) has been derived from grap focus byloes 



^ __, Key Vacas," February 6; and the following day they made Key West. 



At both of these Keys Peale mentions collecting cmstacea, mollusks, etc., but without ment ng 

 land shells. Liguus probably occurs on neither of them. On February 9 Peale landed on Key en 

 to hunt, " but found nothing but some shells." On the 13th they landed on Sand Key, an<1 * cD ™** 

 14 on Boca Chica, where he "found some fine shells." On the 21st, having returned to K «*™«; 

 Peale "collected land shells which we found in great abundance on the trees, some ofthem eery mmso . 



then 



islands near "Bayou Honda" tBahia Honda] 



Peale 



and "found a few good shells." From this account, it seems ver . 



Liguus solidus on Key West, this being the only place where he mentions finding land 



The 



ything else than lAguus solidus 



"This specimen is slightly abnormal in shape, apparently owing 

 has been figured in the Manual of Conchology (2), XII, PI. LVIII, fig 



