AMASTRA, OAHU. 179 



' ' This species was also discovered by Prof. Lyons. It occurs 

 near the base of Punchbowl Hill, at an altitude of twenty or 

 thirty feet above sea-level, in a conglomerate of volcanic tufa 

 and sand cemented together with carbonate of lime. Prof. 

 Lyons thinks the shells must have lived near the spot where 

 they are now found embedded in the rock, as there is no satis- 

 factory way to account for their transportation from any dis- 

 tance. If so, the conditions of climate when the shells flour- 

 ished in that locality must have been quite different from 

 those of the present time" (Baldwin). 



A. vetusta shows the thickening of shell and rude sculpture 

 usual in land shells living in arid places with little shade or 

 cover. It is related to A. transversalis and A. undata, both 

 of which are thinner shells, also differing in shape. It is not 

 more "primitive" than the allied recent forms. The type is 

 figured, coll. A. N. S. P. 



25. A. RETICULATA (Newcomb). PI. 29, figs. 2, 3, 4. 



"Shell conically ovate; whorls 6, much rounded; suture 

 moderate except at the junction of the last whorl, which is 

 deep. Aperture small, ovate ; columella short, with a plicate 

 tooth, nearly transverse. Color brown or chestnut with white 

 transverse lines and markings laid onto the epidermis in 

 various patterns like lace-work or embroidery. Length twelve- 

 twentieths, width seven-twentieths of an inch" [15x8.75 mm.] 

 (Newc.). 



Oahu: Waianae (Newcomb); Lihue (Gulick); Mt. Kaala 

 (Thwing). Co-types in coll. Newcomb and British Museum. 



Achatinella rdticulata NEWC., P. Z. S., 1853, p. 148, pi. 24, 

 f. 54 (1854). PFR., Monogr., iv, 544. BALDWIN, Catalogue, 

 p. 9. THWING, Orig. Descr., p. 159. Achatinella conspersa 

 PFR,, P. Z. S., 1855, p. 7, pi. 30, f . 26 ; Monogr., iv, 544. 



Newcomb 's type was banded below the periphery, like fig. 3. 

 The embryonic whorls appear smooth under an ordinary 

 lens. Subsequent whorls have fine, unequal growth-wrinkles 

 which are strongest below the suture. The aperture is but 

 slightly oblique, flesh-tinted within. There is a strong white 

 rib within the lip. The corumellar lamella is well developed. 



