42 AMASTRA. 



A. BALDWINIANA Pilsbry. PI. 8, figs. 1, 2, 3, 4. 



Vol. XXI, p. 292. The types from Mr. Baldwin were from 

 "Lahaina," a district taking in a large segment of the south- 

 western mountains. Olowalu in Lahaina district, is the larg- 

 est valley on the southern slope. From the sea one looks up 

 a vast gorge cleaving the very heart of the mountains, and 

 terminating in a wall set with peaks. In this gulch Mr. 

 Thaanum took a large series of shells which materially add 

 to our knowledge of this species. 



At the highest locality it was found, there are a few 

 shells agreeing well with the types except that they are as 

 conspicuously malleated as A. nigra. The smaller shells of 

 this lot are often less malleated, and are similar to those 

 from lower in the gulch. 



In the lower locality, out of 390 shells taken, only three 

 are as large as the types, measuring 19, 21.5 and 22.5 mm. 

 respectively. The usual length of adults is 15 to 16 mm. In 

 many shells the cuticle is unfigured except for longitudinal 

 streaks, but others have zigzag or mesh markings as in the 

 affinis group, in mummy brown on a pale ochraceous buff 

 ground, on part of the penultimate and last whorls, finally 

 becoming solid chestnut-black on the last half whorl or less. 

 Until the last whorl there is a delicate carina at the periphery, 

 often visible above the last turn of the suture, and sometimes 

 this persists as an inconspicuous angle on the front of the 

 last whorl ; most of the shells are somewhat malleate, but some 

 show no malleation. The embryo shells are either apricot 

 buff or chestnut brown. 



We cannot point out any important distinction between 

 many of the small, unmalleated specimens of baldwiniana, 

 and A. conifer a Smith, of Kula, East Maui. The peripheral 

 carina persists longer in the latter; none I have seen are 

 malleate, and it is not known to develop a large form like 

 typical baldwiniana. Whether the two are specifically dis- 

 tinct is uncertain. The localities are now separated by a 

 wide area barren of forest shells. The forests of Kula dis- 

 trict are mostly dead or dying. I do not know that any 

 collector since the time of Gulick has found A. conifer a. 



