INVERTEBRATA, CRYPTOGAMIA, MICROSCOPY, ETC. 843 



common species are Poli/siphonia arctica, Rhoclomela tenuissima, a 

 form of B. suhfusca, Sarcophyllis arctica^ Phyllophora interrupta, SpJia- 

 celarla arctica, aud Pldoeospora tortilis. 



In all, Floridece are represented by 12 species, Fucoidece by 16, 

 Cldorophylhiphjceai by 6, Plujcochromophjcece by 1, in the material 

 examined by Kjellmann. 



Algse of the Utah Salt Lake.*— Dr. A. S. Packard, jun., has 

 examined some of the " seaweeds " of the Great Salt Lake which are 

 probably almost the only source of food for the brine-shrimp, as they 

 are diffused through the water in nearly equal abundance with the 

 crustaceans themselves, and do not appear to grow attached to any 

 objects in the lake or on the shore. The most common form is a 

 rounded mass which lives suspended in the water. 



Professor W. G. Farlow, of Harvard University, soaked out and 

 examined the dried material, which he found to consist largely of 

 grains of sand and remains of small animals, mixed with which were 

 three species of Algfe. The most abundant was one forming irregular 

 gelatinous masses, sometimes attaining a diameter of half an inch. 

 The colour, apparently much faded in drying, was brownish with a 

 tinge of bluish greeu,t and he considered it to be a new species of 

 Pohjcystis — P. PacJcardii. Its distinguishing characters are the oblong 

 shape of its cells, which are smaller than in any of the marine species 

 of the genus, and the firmness and lubulated form of the gelatinous 

 substance in which they are embedded. 



There was also a species of Ulva (using the word in the extended 

 sense adopted by Le Jolis) in fragments, so that no very accurate 

 idea of its habit could be formed. The microscopic characters, how- 

 ever, showed that it was, with scarcely any doubt, Ulva marginata Ag., 

 fouud on the coast of Europe. The specimens agreed very well with 

 those from the French coast, considered by Le Jolis to be the sijccies 

 described by Agardh. 



The third Alga was much less abundant than the others, and was 

 in ]i0()r condition for comparison with herbarium specimens. It was 

 a Ilhizuclonium, coming very near to P. salinum Ktz. (R. riparium 

 Harv.), a common marine species of America, and also found in 

 Europe near salt springs. The Salt Lake plant has smaller cells and 

 api)roachcs P. Kochianum, a species also marine and found in saline 

 regions. 



Professor Farlow adds that "as a rule, the Algfc found in saline 

 regions belong to species found in brackish waters on the coast. One 

 might exj)cct to find a large variety of Ulvcno and Confervca; in Salt 

 Lake, and it would bo of interest to sec how closely these inland 

 forms approximate to the littoral forms of the eastern aud western 

 coasts." 



Antherozoids of Hildebrandtia rivularis.t — Sig. Borzi describes 

 the nntheridia of this alga, found abundantly in May on smooth slatc- 



* ' Am. Nat.,' xiii. (1S7'.») p. 701. 



t Tlic colour in life i.t an olives groon. 



i ' Kiviatn acicntilicn," i (ISSO). See ' Dot. Ceutralbl.,' i. (18S0) p. 481. 



