1900] MICROSCOPICAL JOURNAL. 109 



odiscus, Ch»tocero8, Asteromphalus, and Dichtyotha,with 

 fragments of separated rods of a singular organism with 

 which we were unacquainted, and which made up a large 

 proportion of the finer matter of this deposit. Mixed with 

 the diatoms there were a few small Globigerinae, some of 

 the tests and spicules of Radiolarian8,and some saud par- 

 ticles ; but these foreign bodies were in too small propor- 

 tion to affect the formation as consisting practically of 

 diatoms alone. On the 4th of February in lat. 52" 29' 

 S., long. 71° 36' E., a little to the north of the Heard 

 Islands, the tow-net, in dredging a few fathoms below 

 the surface, had come up nearly tilled with a pale yellow 

 gelatinous mass. This was found to consist entirely of 

 diatoms of the same species as that found at the bottom. 

 By far the most abundant was a little bundle of silicious 

 rods (pi. Ill, Fig. 5.) fastened together loosely at one end 

 separating from one another at the other end, and the 

 whole buddle loosely twisted into a spindle. The rods 

 are hollow, and contain the characteristic endochrome of 

 the Diatomaceae." These were Synedra jeffreysii, and S. 

 thalassiotrii Cleve. 



Synedra jeffreysii and Coscinodiscus asteromphalus 

 are cosmopolitan, be it at the equator or at the poles ; and 

 I think they can be said to have been derived from Syned- 

 ra ulna and Melosira varians in fresh-water. Synedra 

 jeffreysii is Synedra fasciculata, C. A. A., which is a Dia- 

 toma fasciculata 0. A. A., and is found everywhere in 

 the ocean. I lately have it from lat. 60° N. in Alaska, 

 being engaged in working up the Bacillaria from the far 

 north, Alaska, in lat. 60° N., for the U. S. Experiment 

 Station, Agricultural College, Brooking, S. D. These were 

 sent to me by Mr. D. A. Saunders, botanist and entomol- 

 ogist and they show that Synedra facisculata, C. A. A., is 

 an extremely cosmopolitan form. 



WANTED. — To exchange diaiomaceous earth. C.W. Smiley. 



