JOU RN AL 



OF THE 



NEW-YORK MICROSCOPICAL SOCIETY, 



Vol. VIII. OCTOBER, 1892. No. 4. 



A NOTE ON A VARIETY OF SALPINGCECA 

 GRACILIS J.-CLK. 



BY ALFRED C. STOKES, M.D., 



Corresponding Member of the New-York Microscopical Society. 



{Presented June \ith, 1892.) 



In October of last year (1891) I received, through the kindness 

 of Mr. Stephen Hehii, a gathering made from the Morris and 

 Essex Canal near Claremont, N. J. The collection was an 

 exceedingly rich one, containing several microscopic animals 

 which up to that time had not been seen by any human eye. 

 These are in the care of my courteous correspondent, and have 

 been by him referred to in a recent number of this Journal. It 

 is consequently not to these remarkable and remarkably interesting 

 creatures that I wish now to refer, but to a minute member of 

 the group of charming Infusoria classed together by system- 

 atists in the order Choano-Flagellata, or " the collared monads." 

 These beautiful little creatures have long been particularly interest- 

 ing to me, not only on account of their attractive and artistic 

 forms, their unusual habits and characteristic structure, but be- 

 cause they are especially American Infusoria, although many have 

 been found in Europe. They were originally discovered here 



Explanation ef Plate 36. 



Fig. 1—Salpingoeca gracilis J.-Clk. Typical form. 



Fig. 2 -A small colony of the brackish-water variety, with two loricse, and with an 

 embryo recently escaped from the parent sheath and secreting its lorica. 



Fig. 3— Embryo soon after separation from the parent. 



Figs. 4, 5, and 6— Embryos leaving the parent lorica to assume a position externally 

 adherent. 



