ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 73 



arise, as there is every reason to believe, from cellular chains closely- 

 related to algsB (just as Amphidinium with the diatoms) then these 

 peculiarities added to the organic complication of the genus Poly- 

 Jcrikos furnished with an integument and nematocysts, would contri- 

 bute to render still more indistinct the otherwise entirely artificial 

 line between Plants and Animals." 



New Choano-Flagellata.* — A. C. Stokes describes some new 

 species of W. Saville Kent's order of Choano-Flagellata, viz. 

 Monosiga rohusta, M. Woodice, M. longipes, Codosiga dichotoma, C. 

 longipes, Salpingoeca acuminata. 



Anatomy of Sticholonche zaiiclea.| — H. Fol gives a detailed 

 account of the anatomy of this Protozoon, which was originally dis- 

 covered and shortly described by E. Hertwig, He regards it as 

 forming a special order of Rhizopods — Taxopoda. The main 

 features of its organization are as follows : — The oval body is covered 

 externally by a firm envelope, to which are attached a number of 

 hollow spicules, probably chitinous, with a slight deposition of cal- 

 careous salts ; these are arranged in radiately disposed groups ; the 

 membrane itself appears to be permeated by a system of fine tubules. 

 The body is composed of a fine granular substance in which are 

 imbedded a vast number of clear spherical globules ; in the interior 

 is a large " reniform body," covered with a closely set array of rods, 

 and containing in its interior a spherical highly refracting body. 

 There are no true pseudopodia, but a series of " arms," somewhat 

 like the suckers of Acinetce, attached in four longitudinal rows to the 

 rods of the reniform body. Thus far the observations are mainly 

 confirmatory of those of Hertwig. The most important addition to 

 the anatomy of this protozoon is the description of a large mass 

 situated on the concave surface of the reniform body. This mass 

 shows two distinct forms, always seen in different individuals, (1) a 

 number of small globules which pass gradually into the sarcode 

 globules of the body, (2) a single large corpuscle increasing in size 

 with the growth of the animal, and which, when it has arrived at 

 complete maturity, is liberated in the form of an holotrichous Infu- 

 sorian. This body was observed and figured by Hertwig in certain 

 Eadiolarians but erroneously described as a nucleus, and since the 

 " nucleus " is inclosed within the central capsule in these Eadio- 

 larians, it seems to be proved that the latter cannot correspond to 

 the reniform body of Sticholonche. The further development of this 

 infusoriform body was watched, and it appeared finally to break 

 up into a number of minute spores, the subsequent fate of which 

 could not be traced. The hypothesis at once suggests itself that the 

 two kinds of individuals, one with the mass of globules, the other 

 with the infusoriform body, are of different sexes, but all attempts 

 at fertilization failed. Nothing therefore can be said with certainty 

 concerning the relations and functions of these different structures, 

 though it is evident that the latter at any rate are connected with 



* Amer. Mon. Micr. Journ., iv. (1883) pp. 204-8 (6 figs.). 

 t Mem. Instit. Nat. Genevois, xv. (1883) pp. 3-35 (2 pis.). 



