HYATT'S CLASSIFICATION, ETC. 361 



LAMINELLA Pf r. 



[Species substantially as in the text, but their affinities are 

 somewhat differently estimated. See below.] 



II. Migrations of Amastra (Hyatt's MS.). 



The general trend of migrations in all of the islands is 

 here assumed to be from Kauai to Hawaii. 



METAMASTRA. This group has been divided into two sub- 

 series, because in these Am. textilis or some form of its series 

 is the primitive or radical form of the associated or branch- 

 ing forms. The evidence of this series as a whole is strongly 

 in favor of the theoretic assumptions of this paper. The 

 reticulata subseries does not afford much evidence, but it 

 shows clearly derivation from textilis, and, in spite of gaps 

 in the evidence, there are no facts positively contradicting 

 any of my theoretic results. The textilis subseries, however, 

 presents a fine series of gradations and these all harmonize 

 perfectly with the theory of descent of primitive species 

 from Kauaian Amastrae; the incoming of migrants at the 

 southeastern extremity of Oahu, their successful colonization 

 of the valleys of this region first, their subsequent migrations 

 with the evolution of new forms as they traveled northwards, 

 and lastly the final colonization of the western range of Oahu 

 by migrants 'from the east range. 



This series ranges from Nuuanu to Ahonui on the eastern 

 range, but it is not represented in many of the valleys be- 

 tween these two. It is also found on the western range from 

 Lehui to Waianae. The transitions from textilis seem to have 

 occurred through the Am. orientalis of the eastern range. 

 These facts accord with the position here taken that the fauna 

 of the western range was derived from that of the eastern 

 range, and was of later origin. The accompanying assump- 

 tion that the fauna of the eastern range itself was derived 

 from Kauai through Am. textilis its most primitive form, is 

 also well supported. The final theoretic conclusion that the 

 landing place of the Kauaian colonists was at the most south- 

 easterly end of the island is sufficiently but not so strongly 

 sustained as the above. There is a gap between Am. orientalis 



