| OCR Text |
Show 1897.] NON-MARINE PAUNA OF SPITSBERGEN. 787 specimens of Cyclops, to be referred to later, none of the belonging to other groups presented any striking malformations. Ehrenberg, in the paper already referred to, records the following species from Spitsbergen : Arcella - ?, Dlffiugla areolata and possibly Dlffiugla microstoma, which could not, however, be found upon a second search. It is not quite certain which species are intended by these names, but it is at least very probable that the " Arcella - ? " was not an Arcella in tbe modern restricted sense, but very likely a Dlffiugla, perhaps a variety of D. constrlcta. The Dlffiugla areolata was almost certainly Euglypha alveolata, and D. microstoma probably Assulina sernlnulum. The following is a complete list of the species observed. The nomenclature adopted by Leidy has been adhered to as far as possible, and in the few cases where he differs from Blochmann (' Mikroscopische Thierwelt des Siisswassers,' Hamburg 1895), the names used by the latter have been added in brackets. AMOTBA VERRUCOSA, Ehrbg. This was the commonest of the three species of naked lobose Bhizopods seen, and occurred in both the adult and young stages ( = A. quadrlllneata, Carter). AMCEBA RADIOSA, Ehrbg. (= Dactylosphcerlum vitreum, H. & L.). Only noticed in one collection. It was the " vitreum " form and not typical A. radiosa. ? PELOMTXA VILLOSA, Leidy (= ? P. palustris, Greeff). The specimens seen, which were not very numerous, were all like the little form figured in the ' Fresh-water Bhizopods of N. America,' pl. v. fig. 9, and they measured about ^io" of an inch in length. DlFFLUGIA GLOBULOSA, Duj. Not very common. DIFFLUGIA PYRIFORMIS, Perty. The larger and more typical forms of this species were decidedly rare. A very small variety measuring TTFO""- 3-^-", with the test often somewhat compressed and the sand grains but loosely joined, was, however, much more frequent, although not abundant. DIFFLUGIA CONSTRICTA, Ehrbg. On the whole the commonest of all the Bhizopods. It occurred in all the collections without exception, which was not the case with any other species. NEBELA COLLARIS, Ehrbg. A rather common species. Many specimens exhibited curious malformations, and a few had their shells pitted in the same way as Hyalosphenia elegans as shown by Leidy (Bhiz. N. America, pl. xx.). A'few examples'of the type figured by Leidy (l c. pl. xxiv. fig. 12) were also observed. |
