566 SUMMARY OF CURRENT RESEARCHES RELATING TO 



shaped Flagellate, with two flagella, a kinetonucleus, a spasmodic jump- 

 ing motion, and longitudinal division. The second is Tetramitus 

 spiralis sp. n., a pyriform Flagellate, with four flagella arising from 

 blepharoplasts, and longitudinal division. The new flagella are formed 

 by outgrowths from the body, and not by splitting of the old flagella. 

 The third is Spvronenia multiciUatum Klebs, which Klebs suggested 

 might be a connecting Hnk between Ciliata and Flagellata. The 

 organella at the anterior end may be equally well regarded as long cilia 

 or short flagella. A circular karyosome of deeply staining chromatin is 

 embedded in the centre of the long narrow rod-like nucleus. The fourth 

 is Anmha laivesiana sp. n., which the author distinguishes from Dobell's 

 A. (/lebse ; and the fifth is A. ayricola sp. n., with a modified mitotic 

 division different from that in any other amoeba. 



Strombidium mirabile.* — E. Penard gives an account of this 

 beautiful new species of Ciliate, which he found near Geneva. It has a 

 " carapace " of hexagonal plates, probably composed of a substance 

 allied to cellulose. The author discusses the trichocysts and their ex- 

 plosive expulsion ; the included Chlamydomonad algte ; the granules of 

 the cytoplasm : the macronucleus and the micronucleus ; the mem- 

 branelles and the peristomial field ; and the process of fission. Apart 

 from fission there is an interesting internal adoral embryonic sac or bud,, 

 which is eventually set free. 



The new species is closely allied to Anigstein's marine species, Strom- 

 bidium testaceum, but the latter has a horse-shoe nucleus, is surrounded 

 by a spiral of roughnesses or bristles, and has the trichocysts in a spiral. 

 Perhaps the nearest affinities of the genus are with the Hypotricha. 



Regulation in Vorticella.f — E. M. Runyan and H. B. Torrey, 

 starting from the well-known fact that, in regeneration, one part of an 

 organism may exert a measurable influence over the growth and de- 

 velopment of another, have made observations and experiments which 

 sbow that such a domination of one part over another exists also in 

 Vorficella. The development of the stalk appears to be dependent on 

 contact at the aboral end ; while the development of aboral cilia is con- 

 ditioned by physiological isolation from the stalk, whether achieved 

 experimentally or by a narrowing of the protoplasmic connexion in the 

 ordinary course of fission. 



New Species of Loxodes.J — Elton R. Darling describes what seems 

 to be a new species of this genus of Holotrichous Ciliata. It is found 

 in great numbers among Oscillaria, associated with Nassula, Paramecium, 

 and Rotifers. Its food consists chiefly of small specimens of Para- 

 mecium. It swims in a spiral to the right. The anterior end is hook- 

 like, but without a rostrum. 



* Mem. Soc. Phys. Hist. Nat. Geneve, xxxviii. (1915) pp. 227-51 (1 pi.). 



t Biol. Bull., xxvii. (1914) pp. 343-5 (8 figs.). 



1 Traus. Amer. Micr. Soc, xxxv. (1916) pp. 64-5. 



