ABSTRACTS OF MEMOIRS. 577 



Notes on the Choanoflagellate Genera Sa/pingoeca and Polyoeca, 



with Description of Polyoeca dumosa, sp. n. By J. S. 



Dunkerly, B.Sc. (Annals Mag. Xat. Hist., Ser. 8, Vol. Y, Feb , 



1910, pp. 186-191.) 

 Note on our Present Knowledge of the Choanoflagellata. By J. S. 



Dunkerly, B.Sc. {Joi'/m. Quekdt Micr. Chib, April, 1910, pp. 19-24.) 



The following is a summary of observations on some Flagellata at 

 Plymouth Marine Biological Station during the month of August, 

 1909. 



Certain late division stages of Salpingoeca vaginicola and the setting 

 free of the daughter cell were observed, and a new species of Polyoeca, 

 P. dumosa, was described from material taken from a tank in the 

 Laboratory, the type species, P. dichotoma S. K. not having been 

 recorded since 1874. The above results were described with figures 

 in Ann. and Mag. Xat. Hist., Ser. 8, Vol. V, 1910, and in addition to 

 the above, the following species of Choanoflagellidae were found : — 

 Codonosiga hotrytis J. CI. 

 Codonocladium umbellatum Tat. 

 Salinngoeca. vaginicola St. 

 „ ampulla S. K. 



„ urceolata S. K. 



„ napiformis S. K. 



Polyoeca dumosa n. sp. 

 Although careful search was made, none of the double-collared forms, 

 Piplosiga Frenz. or Diplosigopsis France, were found, and I have been 

 unable to find these in material from many different localities. That 

 another interpretation than that of a double collar may be placed 

 upon some of the published figures of these forms I have pointed out 

 in another place (Journ. Quekctt Microsc. Cluh, Ser. 2, Vol. XI, 1910). 



J. S. D. 



