464 VARIATION AND ZOOGEOGRAPHY OF LIGUUS IN FLORIDA 

 of the black-brown and the pink pigment. It is an albinistic form the 



exact 



constitution of which can be learned only by breeding 



The form IV, pictus (PI. XXXVII, fig. 2) has bands of brown spots and form 

 III, solidulus, has yellow belts where the other two color-forms have white 

 pigmented bands. They are negatives, so to speak, of the others. Yellow in them 

 takes the place of white, in the others, and white replaces yellow. Pictus is 



un- 



apparently a mutation (in the de Vriesian 



) of graphicus, parallel to the 



mutations marmoratus and testudineus . Form solidulus holds exactly the 



relation to pictus that solidus does to graphic 



These forms are everywhere 



excessively rare at the present time, and possibly extinct 



Dimensions. — In the larger keys the ordinary adult length of L. solidus 

 graphicus and solidulus is about 58 to 65 mm. The pictus and solidus seen are 

 smaller. When not otherwise stated the dimensions below are of the graphicus 



form. 



No-Name Key. Collected by Pilsbry and Simpson, 1907. 



Length 70 mm. 

 Length 67 mm. 

 Length 64 mm. 

 Length 63 mm. 

 Length 62 mm. 



Length 62 mm. 



Length 61 mm. 

 Length 59 mm. 

 Length 56 mm. 



diam. 31 mm. 

 diam. 30 mm. 

 diam. 29 mm. 

 diam. 31.5 mm. 

 diam. 29.5 mm. 

 diam. 29 mm. 

 diam. 29 mm. 

 diam. 27 mm. 

 diam. 27.5 mm. 



mm. 



length of aperture 31 

 length of aperture 29 mm. 

 length of aperture 29 mm. 

 length of aperture 29 mm. 

 length of aperture 28.5 mm. 

 length of aperture 27.5 mm. 

 length of aperture 27 mm. 

 length of aperture 26 mm. 

 length of aperture 26 mm. 



) 



On No-Name Key Hemphill in 1883 collected a number of small, light speci- 



of which I have figured in the Manual of Conchobgy 

 An adult specimen measures: Length 51 mm.; diameter 



These must have been from a different 



mens of graphicus, o 

 XII, PL LIX, fig. 97 

 25.5 mm. ; length of aperture 24 mm 



».u mill., leiigtii ui tt^ci iuio **-*. *»mi. *.m.+^~ — — ~ uifprl 



. lony from that examined by us. We found only dead shells, chiefly mnaDitea 

 by crabs, though part of them retain the color in all its freshness. 



was 



with that habitat on the labels, but with 

 ch, Wright, Arango or any other Cuban : 



I cannot learn that 



length 



I saw no pictus in the Havana collections, nor ma i nna i* m my j««-^ y- vera i collecting 



island, from the north to the south coasts, nor has it been taken by J. B. Ue ™*™°* hutnues f Sagra'a 



his Atlas of 



Mollusques 



journeys in Cuba. Orbigny figures a specimen of pictus in nis Auas w ^ . s in the text, 



History of Cuba, plate VI, fig. 6; but he makes special mention of Flondan + f ~ - n - a j Mottush, 

 __„ ./ =_ Jn_MH A i.:_ * .„„ A„ n „ rn t^n nno nf tfcps«. Binnev. in the lerresinu* 



at this figure was drawn from one of these. Binney 

 us on pi. LVI, lower and left-hand figures, and solidul 



mistaken 



to the Florida Keys. The form solidulus resembles solidus superacid , «■«• f&int trace oi 



hitherto; but it is an albinistic variation of pictus. In one of the specimens t ftU inte r- 



a-*. „:J * „:_ :„ ... „i„„ Q „™ n +.Ha r^rinV^ml line. This is the only specime 



dark niement remains in 



ern I have seen in the entire L. solidus 





