PARTULA GIBBA, GUAM. 85 
The Lonfit shells are collectively the largest and the slenderest of all of the 
colonial series—a fact duly pointed out in the section dealing with intercolonial 
comparisons. ‘The bicolor, which reappear at Ordot, are too few to justify the seem- 
ingly natural deduction that their aberrant measurements indicate a real differen- 
tiation from their associated mitella class. The statistics of lip-color and of tooth 
development (table 35) require no comment. 
From the full and interesting statistics of the Macajna second collection 
(table 36) it appears that, in contrast with the Pago north comparison, mitella- 
rubra differs from the mitella class in opposite ways so far as the absolute measures 
of the shells are concerned, but to insignificant degrees in the matter of proportions. 
The aperture characters do not exhibit the same relations; in mitella-rubra of 
Pago north this feature is longer, narrower, and far more slender than in mitella 
of the same place, while at Macajna second it is shorter, narrower, and slightly 
more slender in the first-named group. Without multiplying the citations, it is 
certain that no consistent differences in measures accompany one or another of the 
distinctive modes of coloration; all classes seem to intermingle so far as statistical 
qualities are concerned. A detail of interest is that the purplish color-orders run 
rather larger than their ruddy counterparts in all of the darker classes, but the 
differences are not statistically significant in all cases, and an exception need not 
be entered. The lip in castanea shells (table 37) sometimes shows a slight tinge of 
the brownish color of the body-whorls. The tooth (table 37) is weakly developed. 
TABLE 37.—Partula gibba, Guam. South Central Region (cont.), Macajna second. 













Lip. Tooth. 
Series. No. 
Brown; 
White. | Yellowish.| brown- Rosy. |Purplish.| None. Trace. | Small. 
orange. 
ATT R OLR eae cnt Oe ys <fciore retin atni)& 76 17 11 48 eats 64 12 
Mibtelis-T Praises: sat. ow ae saree Ze 13 2 7 afore 22 
ET re ie Ee Be ee ae 18 12 4 2 eres 16 2 
phea-purpurea..............-- 7 3 Byes 4 mike 7 wind 
castanea-rubra................ 1 2 3 Pare 
castanea-purpurea............. 4 : 1 Seas 3 4 Jes 
VESPETA-TOSEA. 0... ee ects cece 8 8 see an 6 2 
vespera-cyanea............+5+- 1 1 1 ee 
PALER Shas MOe Uefa chs n.ctaie oe (asi Be 139 54 17 63 2 3 123 16 






The data for the remaining collections from the South Central Region are 
given in tables 38 and 39; in principle they confirm the conclusions drawn from 
similar facts in foregoing sections. 
Coast Central Region.—Only in the case of Aniguac are the numbers satis- 
factorily ample; at numerous places within this territory collections were made, 
often in passing, mainly to discover what types were present. The statistics 
(tables 40 and 41) provide additional material for detailed comparisons like those 
made earlier. 
The unique marginata class of Dungcas does not differ substantially from its 
associates in its measurable qualities. This is important, because it proves that 
