312 Miscellaneous. 



jfilaria ; but in the nuclear formation it is the nucleolus that first 

 appears — a fact which it is important to notice, and which is the 

 more striking because M. van Benedeu has observed in the adult 

 O. gigantea a successive disappearance and reappearance of the 

 nucleoli. 



To sum up, the Gregarina of the lobster would pass, in the course 

 of its embrj^ouie development, through the following phases : — the 

 Monerian phase, the phase of the generative cytode, that of the 

 pseudofilaria, that of the protoplast, that of the encysted Gregarina, 

 and that of psorospermia. 



There would therefore be in its evolution two phases during 

 which reproduction would take place by division : — 1, that which 

 gives origin to the psorospermise after encystation ; 2, that in which 

 the generative cytode produces pseudofilarige. — Journal de Zoologie, 

 tome i. (1872) pp. 134-165 ; Bibl. Univ., Arch, des Sci. July 15, 

 1872, p. 256. 



Diatoms in Hot Springs. 



Dr. Blake has collected diatoms at a hot spring in Pueblo valley, 

 Humboldt Co., Nevada, the temperature of which was 163° F. 

 More than fifty different species were recognized by him ; and they 

 were found to be mostly identical with the species found in beds of 

 infusorial earth in Utah and described by Ehrenberg, showing that 

 the latter must have been accumulated in a hot lake, of about the 

 same temperature. No other living species were found in the hot 

 waters, excepting red algse. The deposit was a large one, and in it 

 there were concretions of silica. On making a thin section of one of 

 these concretions, a pair of legs of a coleopterous insect were visible 

 in the quartz ; the greater part of the concretion was made up of 

 petrified algae. 



In one of the hot springs at the California geysers, having a tem- 

 perature of 198° F., he found two kinds of Conferva — one capillary, 

 resembling Hydrocrocis Bischoffti, but larger ; the other a filament, 

 with globular enlargements at intervals. In another spring, the 

 temperature 174° F., many Oscillariae were found, which by the 

 interlacement of their delicate fibres formed a semigelatinous mass, 

 and also two diatoms. In the water of the creek of Geyser Caiion, 

 112° F., the alga3 formed layers sometimes 3 inches thick, covering 

 the bottom of the pools, and the same diatoms were found as in the 

 174° spring. The waters are acidulated by the presence of free 

 sulphuric acid ; and Dr. Blake suggests that this may account for the 

 rarity of diatoms. — Proc. Gal. Acad. Sci. iv. pp. 183, 189, 193, 197. 



On the Habits of Galeodes paUipes. By Prof. Cope. 

 Prof. Cope exhibited a specimen of a G(deodes, probablj^ G.pallipes 

 of Say, taken in the town of Denver, Colorado, by Dr. Gehrung. 

 According to that gentleman, it was common in that place in houses, 

 and was an enemy and destroyer of the Cimex lectularius (bed-bug). 

 In captivity, it showed a preference for them as food, and crushed 

 them in its short falces, preliminary to sucking their juices. — Proc. 

 Acad. Nat. Sci. Phil, part iii. p. 295 (1872). 



