CCXXIV 



FAUNA HAWAIIENSIS 



The earliest record of the existence of slugs in the islands, that I have been able 

 to find, is contained in the MSS. of one of the old bird collectors (Bloxam) who found 

 ' slugs in the maw ' of Oreomyza, shot on Oahu near Honolulu. I suspect, however, 

 that this remark really applied to Siucinea, which is very rarely eaten by some birds. 

 We have never found Limacidae to be eaten by them, and the Philomycidae are 

 certainly of quite recent introduction. The species of Agriolimax and Amalia, though 

 some have been described as peculiar to the islands, have not the appearance (from 

 their distribution, etc.) of being native, but are probably all introductions by man. 



The Zonitidae (with seven genera) were little collected by me. Godwinia tenella 

 was found at a higher elevation (9000 ft.) than any mollusc that I met with. The 

 Endodontidae are, no doubt, numerously represented by endemic species. Some of the 

 species are common beneath the bark of trees, and are particularly fond of Cheirodendroii. 

 Others occur beneath large decayed logs, or on the ground amongst decayed leaves. 



Of the Helicidae the introduced Eulota is now widely spread and extremely 

 common in many places. It has been observed high up the mountains on Hawaii. 

 Papuina barnaclei is in the list probably on account of the specimens having been 

 wrongly labelled as to locality. 



The very minute shells of the genus Ptipa of the Pupidae were not collected by 

 me. The species are numerous and often found in a sub-fossil condition. 



Of the Achatinellidae, the sub-genus Achatinella, s. str., is found only on Oahu, as 

 also is Bulimella, both with numerous species or at least local forms. Parhihna is 

 entirely confined to the three adjacent middle islands, Maui, Molokai and Lanai, 

 excepting that the aberrant species A. (P.) dubia is found on Oahu, and two or three 

 aberrant forms, for which a distinct sub-genus {Ba/diuinia) has been proposed, are 

 peculiar to Hawaii. Acliatinellastruvi is chiefly developed on Oahu, but also occurs on 

 Maui, and is barely represented on Molokai. The distribution of these sub-genera is 

 of great interest. 



• The beautiful shells of Achatinella (s.l.) have been so much studied and collected by 

 others that it is not necessary for me here to make any lengthy remarks. Practically 

 all the species, except on rare and probably accidental occasions, are of arboreal habits. 

 They are found on leaves, branches or trunks of the forest trees, and individuals of a 

 species are frequently not at all particular as to what part of the tree they frequent, nor 

 as to the species of tree. They are often found numerously on quite dead trees, and in 

 many places are abundant on those imported by man, especially the guava, and even 

 on Lantana camara. The Myrtaceous 'Ohia' being the dominant forest tree probably 

 contains more of these shells than any one other species of plant. It is doubtless due 

 to the fact that the Achatinellas do not feed on the trees themselves, but on the small 

 organisms that grow on these, that they are found on so many native and foreign plants. 

 Great diversity of opinion exists as to the limits of the species of Achatinella (s.l.) and 

 a very great deal of special breeding will probably be necessary before these limits can 



