1892.] MICROSCOriCAL JOURNAL. 



BIOLOGICAL NOTES. 



109 



Circular Growth of Fungus. — Referring to the note on page 

 loi of the Journal, bearing this same title, Dr. Shanks, of Al- 

 bany, write: "Myxomycetes mean mucous-like fungi. They are 

 characterized by a mucilaginous or protoplasmic filamentous ma- 

 trix. A creeping amoeboid mass develops from the spore and 

 grows by absorption of nutriment and also by union or fusion of 

 contiguous masses. Certain necessary conditions of the atmos- 

 phere and soil being present, the growth of the fungus is very rapid, 

 two or three days being sufficient to bring about fructification. 

 In the above case there was probably an original central colony 

 which grew by extension, like an immense 'ring-worm,' and 

 only became visible when the spores were developed." 



DIATOMS. 



The Mobile Deposits, — Mr. K. Tvl. Cunningham sends us 

 the following list of the species of diatoms occurring in the de- 

 posit of marsh mud on the west margin of Mobile river. It is 

 located three-quarters of a mile north of One-Mile creek, within a 

 hundred and fifty feet east of the main line of Louisville and 

 Nashville R. R., near Mobile, Ala. The deposit was discovered 

 in July, 1S91, the stratum having a depth of about six feet, and 

 has been fully described in the February, 1892, number of this 

 journal. The species included in this list were identified through 

 the courtesy of D. B. Ward, M. D., Poughkeepsie, N. Y. 



Achnanthes Sp .'' (fine form). 



I Actinocyclus Barklyi, Ehr. 



I == A. dubius. Grun. 

 Amphiprora pulchra. Bail. 

 Amphora proteus, Greg. 

 Actinoptychus undulatus, Ehr. 

 Biddulphia lajvis, Ehr. 

 Campylodiscus echeneis, Ehr. 



^= C. cribrosus, W. Sm. 

 Cocconema lanceolatum, Ehr. 

 Coscinodiscus asteromphalus, 



Ehr. 

 Coscinodiscus robustus Grev. 



(small variety). 

 Coscinodiscus subtilis, Ehr. 

 Cyclotella striata, Grun. 

 Cymatopleura elliptica, Breb. 

 Cymbella gastroides, Kiitz. 

 Epithemia gibba, Kiitz. 



Epithemia turgida, Kiitz. 



" zebra, Kiitz. 



Eunotia major, Raben. 

 '' diodon, Ehr. 



" pectinalis, Kiitz. 



" triodon, Ehr. 



•' dodecaodon, Ehr. 



Grammatophora marina. 

 Gomphonema capitatum (va- 

 riety). 

 Melosira granulata, !Pail. 



" sulcata Kiitz = Ortho- 



sira marina, W. vSm. 

 Navicula amphirynchus, Ehr. 

 *•' cuspidata, Kiitz. 

 " Dariana, A. Schmidt. 

 " didyma, Ehr. 

 " Fischeri, A. S. 

 " formosa, Greg. 



