AM ASTRA. 35 



fig. (also fig. 18, type fig. of A. fusiformis Pfr.). Probably 

 Mapulehu is the type locality of this species. Specimens col- 

 lected there by Mr. Thaanum are figured on pi. 3, figs. 1-3. 

 It is also type locality of the synonymous A. simularis. Mr. 

 Thaanum has collected large series of a somewhat smaller 

 form, length 12% to 15% mm., in Mapulehu gulch. The 

 aperture is usually less than half as long as the shell. The 

 cuticle varies from elaborately figured to nearly plain. The 

 ground-color is buff -pink, flesh or cinnamon, generally paler 

 at the base, which may be white. More rarely the whole 

 ground is white. The shell is quite thin. 



Further west, in Ualapue, Mr. Thaanum found a somewhat 

 more solid form, with obscurely tessellated or merely streaked 

 cuticle. 



Still further west, the color-variety atroflava was found by 

 Dr. Cooke and myself in the northwestern ravine of Kamalo, 

 above the ditch trail. The ground is cream or naples yellow, 

 sometimes fleshy at the base, and the markings are mummy 

 brown or blackish. Probably the types were from Kamalo, 

 as figs. 9-12 of pi. 41 resemble these shells. Kamalo and 

 Kawela are the western limits of mucronata, in any of its 

 forms. 



Eastward of Mapulehu, Mr. Thaanum has collected forms of 

 mucronata in Waialua and Moanui valleys on the south- 

 eastern coast, and at Manawai opa in the great Halawa 

 valley. The shells from these eastern localities are more obese 

 than those from farther west, and might be segregated as a 

 subspecies perhaps. 



In Halawa the ground-color is often very dark, liver 

 brown; but others are pale, marguerite yellow. The mark- 

 ings are typical. Near the mouth of Halawa Mr. Thaanum 

 found fossil specimens, resembling those of Mapulehu in 

 shape. 



The several varieties of Ancey and Sykes, noticed in Vol. 

 XXI, are based chiefly upon ground-color, which is extremely 

 variable in any large lot. Mr. Ancey 's var. maura is typical 

 simularis, that is, a form of mucronata. Possibly the locali- 

 ties of varieties roseotincta and citrea could be given by Mr. 



