1897,] NOX-MAKINB FAUJS-A OF SPITSBERGEN. 787 



specimens of Cyclops, to be referred to later, none of the animals 

 belonging to other groups presented any striking maltormations, 



Ehrenberg, in the paper already referred to, records the follow- 

 ing species from Spitsbergen : Arcella — ?, DiJJlugia areolata and 

 possibly D'lffluciia 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 the modern restricted sense, 

 but very likely a Difflugia, perhaps a variety of D. constricta. 

 The Difflugin areolata was almost certainly Euglypha alveolata, 

 and D. microstoma probably Assulina semiimliim. 



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. 



Amoeba tekrtjcosa, Ehrbg. 



This was the commonest of the three species of naked lobose 

 Ehizopods seen, and occurred in both the adult and young stages 

 {= A. quadrilineata, Carter). 



Amceba eadiosa, Ehrbg. (= Dactylosphcerium vitreum, H. & L.). 

 Only noticed in one collection. It was the " vitreum " form and 

 not typical A. radiosa. 



?Pelomyxa villosa, Leidy (= 'i P. palustris, Grreeff). 



The specimens seen, which were not very numerous, were all 

 like the little form figured in the ' Fresh-water Ehizopods of N. 

 America,' pi. v. fig. 9, and they measured about -^ru "^ ^^ ^^^^ i^ 

 length. 



DiFELTJGIA GLOBULOSA, Duj. 



Not very common. 



DiFFLTiGiA PXRiEORMis, Perty. 



The larger and more typical forms of this species were decidedly 

 rare. A very small variety measuring j^"- -3^", with the test 

 often somewhat compressed and the saud grains but loosely joined, 

 was, however, much more frequent, although not abundant. 



DlEFIitlGIA CONSTRICTA, Ehrbg. 



On the whole the commonest of all the Ehizopods. 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, aud a few had their shells pitted in the same way as 

 Hyalosphenia elegans as shown by Leidy (Ehiz. N. America, pi. xx.). 

 A few examples of the type figured by Leidy (l. c. pi. xxiv. fig. 12) 

 were also observed. 



