PARTULA, MOOREA. 207 



' ' On the -southwest part of the island we find tceniata toler- 

 ably abundant in three valleys, and, like the shells in the 

 western part of Opunohu, it is subject to much less variation 

 than obtains in the eastern part of the same valley. The 

 shells from the southwest coast were described by Pease un- 

 der the name of P. simulans [pi. 29, figs. 8, 12, 13]. 



"In the third or more eastern valley, where they come in 

 contact with P. elongata and lineata, hybrids between the 

 former and tceniata are so numerous that, any one collecting 

 in that valley only would, without hesitation, pronounce them 

 one and the same species. 



"From this point to a distance of several miles, the valleys 

 are inhabited by lineata, mooreana, elongata and lineata, var. 

 stngosa, only. But after passing Oahumi, the home of the 

 latter variety, we again find tceniata, but nearly as variable as 

 the eastern Opunohu shells, and mixed with the form known 

 as striolata, Pse., with which it intergrades. Here I found 

 several unmistakable hybrids between strigosa and tceniata. 

 All the valleys between this latter location and the one near- 

 est to Opunohu are inhabited by the typical form striolata, 

 which scarcely differs from nucleola, except in being smoother 

 and more variegated with stripes. In a large valley adja- 

 cent to Opunohu, we find these shells by thousands; they 

 differ in being beautifully striped like stngosa. Here, again, 

 it insensibly graduates into the typical tceniata. Whether the 

 inosculation takes place through hybrids or not is a difficult 

 question to decide. In looking over a large collection from 

 the eastern part of Opunohu, I find some of the small forms 

 are not dissimilar to the typical striolata, which has suggested 

 the propriety of following Dr. Hartman in consolidating the 

 three forms." (Garrett). 



P. tceniata spadicea Reeve. PI. 41, fig. 18. 



"Shell perforate, conic-oblong, thin, very minutely decus- 

 sate, diaphanous, brown-corneous streaked with paler. Spire 

 long-conic, rather obtuse; suture margined. Whorls 5 to 



>, a little convex, the last equal to the spire or a little 



