EUTETRAMORUS GLOBOSUS, A NEW GENUS 



AND SPECIES OF ALG.E BELONGING TO 



THE PROTOCOCCOIDEA (Family 



CCELASTRID^) "' 



While studying the plankton from "Mirror Lake," a 

 small pond on the campus of the State University at 

 Columbus, Ohio, exceedingly rich in phytoplankton at 

 certain times of the year, a form quite unique in structure 

 was noted with much interest. It consisted of 16 cells, 

 each containing a chloroplast, the cells being arranged in 

 groups of fours and imbedded in an almost invisible gela- 

 tinous matrix. The organism was non-motile with no 

 trace of flagella. The preparation was one taken from a 

 sterilized specimen bottle filled with water and floating 

 algas — ^mostly Cladophora — at the margin of the lake, 

 Oct. 9, 1915, the observation being recorded a few days 

 later. An interval of over two years has elapsed during 

 which period various samples of water from the lake have 

 been studied without again noting the species, however. 



The organism is referable to the Family Ccelastridce 

 {Coelastracece) of the Profococcoidea^ and constitutes a 

 new genus quite different from forms thus far known. 

 The drawing is taken from a camera lucida sketch made 

 at the time with a Leitz Binocular, 2 mm. apochromatic 

 objective. 



Eutetramorus n. g. 



Cells non-motile, light chlorophyl green; united into a 

 colony of 16 cells arranged in groups of 4's within a gela- 



■'The endings of the Class and Family names are identical with those utilized in 

 a systematic review of the typically unicellular forms which will be published 

 shortly. They are an extension of those proposed by Poche (1911). Nomenclatural 

 methodology, particularly among the primitive plant-animal organisms is in a some- 

 what chaotic condition. 



^Reprinted from The Ohio Journal of Science, vol. 18 (1918), pp. 12 5-127. 



i 



