ACHATINELLA LOBATA. 283 



A. lorata form melanogama P. & C. PL 51, figs. 1-3 ; pi. 52, 

 figs. 8, Sa. The shell is somewhat more slender than in Tan- 

 talus lorata, with about 6~y 2 whorls; mutations in the hybrid 

 colony as follows. PL 52, figs. 8, 8a, black, uniform or with 

 indistinct mahogany-red streaks, sutural border and embry- 

 onic whorls white or buff ; lip black-edged within. 



PL 51, figs. 1, 2, white, the lower half of the last whorl 

 pale yellow with ocher or ochraceous tawny streaks, sometimes 

 one or two spiral lines; embryo white; peristome vinaceous 

 pink. Sometimes the colored cuticle remains only on the 

 parietal wall. 



PL 51, fig. 3, white throughout except for the vinaceous pink 

 peristome. 



Length 19.6, diam. 10, aperture 9 mm. 



Length 18.2, diam. 11, aperture 9.5 mm. 



Maunawili, on the north side of the main range opposite 

 Manoa valley the Kailua flank of Mt. Olympus. Collected 

 by Messrs. D. B. Kuhns and W. D. Wilder. Cotypes 108767 

 A. N. S. and in Wilder coll. 



This is one of the incipient races distinguished by contain- 

 ing certain peculiar color-forms, in a hybrid colony also hav- 

 ing normal patterns. Such forms as this are not subspecies 

 in the proper sense, but it is convenient to have names for 

 what seem to be elementary patterns, even though they are 

 not extricated from the parent race. 



The black form is a mutation which occurred in a colony 

 of rather lengthened white-ground lorata. In the hybrid 

 colony resulting there is complete segregation of the color- 

 forms, in a series of over one hundred individuals seen. Em- 

 bryos from a typical black mother are figured, pi. 50, figs. 16, 

 16a. They vary from cinnamon to white. I do not know that 

 dark embryos occur in light individuals ; all of the latter now 

 before me have white apical whorls. 



31a. A. LORATA NOBILIS Pfr. PL 50, figs. 1 to 5. 



On top of the Nuuanu-Kalihi division ridge, at 2000 feet 

 elevation more or less, A. lorata is replaced by a race or sub- 

 species which differs by its longer shell of 6% to 7 whorls 



