128 ACHATINELLA VIRIDANS. 



pearance of a colony suggests rutila X subvirens or rutila X 

 tceniolata. It might be well to recognize siibvirens as an east- 

 ern subspecies of viridans, rutila and macrostoma to be syn- 

 onyms of it. 



Color form rutila Newcoonb. PI. 25, figs. 10, 11, lla-e, 12. 



' ' Shell ovately-conic ; whorls 6, rounded, the last margined 

 above; suture well marked; aperture subquadrate; lip ex- 

 panded, subreflected, strongly thickened within; columella 

 short, terminating in a strong, twisted plait. Color a light 

 straw, olive or brown ; lip white or somewhat roseate. Length 

 17, diam. nine-twentieths inch.' (Newc.) 



Niu (Newcomb, type loc., pi. 25, figs. 10, 11 to lie. The 

 color-form figured by Newcomb as typical is streaked with 

 light green on a yellow-green ground, with several spiral 

 brown bands below the periphery (pi. 29, fig. 21, reproduction 

 of Newcomb 's type figure ; pi. 25, fig. 10, specimen from New- 

 comb) . In other shells from Niu, collected by Gulick, figs. 11 

 to lie, the spiral bands may be more numerous or they may 

 be wanting. The streaks are sometimes chestnut or umber, 

 and either distinct or blended. The sutural border is almost 

 invariably tessellated with brown, thus differing from var. 

 subvirens, in which it is white, or at least not more heavily 

 marked than the rest of the shell. Wailupe shells are similar 

 (pi. 25, fig. 12). 



In Waialae valley the color is usually light, and specimens 

 having bands like rutila with the white suture of subvirens 

 were found by Gulick and kept by him in the same lot with 

 others having the tessellated suture of rutila. See pi. 25, figs. 

 5 to 5d. There is no definite break between the two forms, 

 merely a matter of one or another color-mutation prevailing 

 in the colony. Even as far west as Palolo there are some 

 shells with more or less tessellated sutural border. 



A. macrostoma Pfr. seems to me to be a form of rutila, as 

 Newcomb held, specimens of similar pattern to Pfeiffer's fig- 

 ured type occurring in Waialae Nui (pi. 25, fig. 8, Cooke 

 coll.). The original figure is reproduced, pi. 30, fig. 6. Mr. 

 Sykes has thought it a synonym of t&niolata,, and it must 



