ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 193 



tion the reactions of the two united individuals are not co-ordinated 

 Eacli responds to stimuli independently. 



Pigment of Fabrea salina.* — J. Donnasson and E. Faure-Fremiet 

 discuss the reddish-brown nitrogenous pigment (fabreiue) which is 

 precipitated in granular form in the cytoplasm of this Infusorian. It is 

 very soluble in acetone and in alcohol ; it contains phenolic nuclei ; 

 spectroscopically it seems to approach the blue stentorine of Stentor 

 cmruleiis ; but its chemical nature remains obscure. 



New Marine Suctorial Infusorian.j — - Olaw Schroder describes 

 Tokoplirya deueri sp. u. from the Adriatic, where it was found growing 

 on Euchaeta hehes, a typical Copepod of the Plankton. In spite of its 

 unknobbed tentacles, the form is referred to the genus Tokophrya, in 

 the vicinity of T. interrupia of the South Atlantic, which differs in 

 having the wreath of tentacles interrupted at two points and in having 

 no disk at the base of the stalk. 



Cercomonadina.^ — A. Alexeieff discusses the family Cercomonadina 

 Biitschli {iion Cercomonadidas Kent), which includes forms with one or 

 with two flagella, with a superficial blepharoplast, and with metabolism 

 in the posterior end. It is represented hj Cenomonas and other genera. 

 The related family Herpetomonadina {mn Trypanosomidae Doflein) 

 includes forms with a single flagellum, with the blepharoplast deeply 

 situated, and with no metabolism or with slightly marked metabolism. 

 It is represented by three genera — Herpetomonax, Crithidia, and Try- 

 panosoma. 



Structure of Trypanosoma gambiense (Dutton).§ — David Bruce 

 compares this species with T. brucei The two are closely alike in size 

 and general appearance. Both are markedly dimorphic. There are the 

 same long and slender, intermediate, and short and stumpy forms in both. 

 It appears that T. gambiense is richer in short forms and poorer in long 

 forms than T. brucei. Whether these slight differences are fundamental 

 or only accidental it is impossible at present to say. 



Dimorphism of Trypanosoma gambiense var. rhodesiense.|| — N. H. 

 Swellengrebel has used biometric methods to show that there are two 

 distinct forms — lanky and thick respectively. He could not recognize 

 the trimorphism reported by Hindle. The thick forms (broader than 

 2 fx. and not longer than 24 /j.) are the more resistent to injurious in- 

 fluences. It may be that they represent females. 



Reproduction of Pleistophora periplanetse.lT— H. Epstein has studied 

 this Cnidosporidian, which is common in the Malpighian tubules of the 

 cockroach. In following the history of the spore he has observed a 

 process of nuclear reduction, followed by a process of autogamy. 



* C.R. Soc. Biol., Ixxi. (1911) pp. 515-17. 

 t SB. Akad. Wiss. Wien, cxx. (1911) pp. 757-63 (1 pi.). 

 X C.R. Soc. Biol., Ixxi. (1911) pp. 506-8 (6 figs.). 

 § Proc. Roy. Soc, Series B, Ixxxiv. (1911) pp. 327-32 (1 pl.). 

 II Centralbl. Bakt. Parasitenk. Ixi. (1911) pp. 193-206 (9 figs.), 

 i Biol. Ceutralbl. xxxi. (1911) pp. 676-82 (16 figs.). 



