There is also some resemblance between the foliage of _Acrista_ and _Cocops_, but the absence of sheathing leaf-bases in the latter genus will enable even young specimens to be separated. Moreover the leaf-divisions of _Cocops_ are much narrower and those at the end of the leaf are not so much shortened as in _Acrista_. Further differences from _Roystonea_ are to be found, such as the much smaller size and the larger roots, which are tuberculate and inclined to become superficial like those of the llume palm. The sheathing leaf-bases are not as long proportionately as in _Roystonea_, and there is a distinct formation of fibers, although the texture is flimsy. The outer sheaths do not split off and fall away as promptly as in _Roystonea_ but several dead ones sometimes hang from about the base of the crown. Although the sheath is longer than in _Aeria_ the fibers are much better developed, there being but a few membranous shreds in _Aeria_, and no distinct fibers at all. Among the mountains between Cayey and Guayama many summits are covered with the _palma de sierra_, probably in places which have never been cleared. A few of the palms follow down the steeper uncultivated ravines. From a distance the crowns suggest royal palms but a closer view renders the difference apparent. There is also no suggestion of the bulging trunk of _Roystonea_. In height the _palma de sierra_ probably does not exceed the royal palm. The tips of leaflets of young leaves are connected by two brittle red strands both of which lie on the mesial face, one along the edge, the other near the middle. The tips of the leaflets are of the same material and are sometimes persistent as long corneous appendices like those of the cultivated _Howea_. The generic name _Euterpe_ Gaertner, which is commonly applied to a considerable series of American palms related to the present, was in reality established for the Malayan genus for which the name _Calyptrocalyx_ Blume is now in use, _Pinanga silvestris globosa_ Rumphius being cited by both Gaertner and Blume as the original, in the one case, of _Euterpe globosa_, and in the other of _Calyptrocalyx spicatus_. The origin and identity of the seed described and figured by Gaertner have not been established, and seem likely to remain in doubt; but in describing _Calyptrocalyx_, Blume argued that the generic name should remain with the seeds studied by Gaertner and declared that these did not belong to any Malayan species but to some of the arecoid palms of the Mascarene Islands. This suggestion seems not to have been disposed of by Martius or others, but the fact that Gaertner’s fruits showed an apical stigma seems to exclude them from the American group with which the generic name has been associated.