256 SUMMARY OF CURRENT RESEARCHES RELATING TO 



long axis of the body, instead of being only about tlic Icngtli of tlio long 

 axis ; it moves by contractions of its apiiendago, and not as do freed 

 Vorticellines by the anterior circlet of cilia ; its form is exactly the 

 opposite of that of Spastosti/la ; its body is grooved, and not smooth ; 

 it has no peristome, and seems to have no mouth ; its protoplasm is 

 not colourless, but reddish brown ; it is without symbiotic zooxan- 

 thelli. Its pigment body diflfcrs from the ocellus of Lizzia, which 

 Vogt supposed had been swallowed by being accllular, sharply 

 limited at its edges, and the lens-like body is large, and is partly dis- 

 solved by osmic acid. Other points of difference are noted. 



Protozoa of the Gulf of Genoa.* — Dr. A. Gruber describes 30 

 new species of Protozoa, which include the types of seven new 

 genera besides a number of others already known, from the Gulf of 

 Genoa. The new genera he names as follows: — Craterlna mollis, 

 Urnulina difflugiceformis, Spirostomina lucida, Orthodon hamahis, 

 Hypocoma parasitica, Stylccjma ovifarmis, and Polymasiix sol ; all 

 these new genera and species, as well as several others previously 

 known, are described and figured. 



Craterina mollis is a peculiar rhizopod ; the protoplasm is sur- 

 rounded by a thick sheath, which does not appear to be chitinous, 

 but merely a thickened portion of the protoplasm itself; one eud 

 possesses an aperture leading through the outer sheath in the furm of 

 a funnel apparently lined by a continuation of the sheath. No 

 nucleus was discovered. 



Urnulina difflugiceformis is a monothalamous rhizopod possessing 

 a somewhat oval shell composed of sand particles and opening by a 

 widish aperture. Only a single specimen was seen alive, and no 

 details can be given as to the condition of the protoplasm, though no 

 nucleus appears to be present. 



Spirostomina lucida is a heterotrochous infusorian chiefly remark- 

 able for the presence of two nuclei ; either one or a great number 

 are characteristic of the group. 



Orthodon hamatus, though differing gencrically from all other 

 Infusoria, does not seem to present any special features of interest. 



Hypocoma parasitica. — This species, which is excessively minute, 

 is found attached to colonies of Zoothamnium ; the under surface, 

 ■where the cilia are borne, is sunk below the remainder, and very 

 likely serves as a disk of attachment ; they appear to feed upon tho 

 Zoothamnia. 



Stylocoma oviformis. — The body is oval, going to a point behind ; 

 in front of the mouth is a kind of collar, projecting in front of the 

 rest of the body; the cilia of the body are arranged in a rather 

 unusual fashion. 



Polymastix sol is a flagellate infusorian with radiately arranged 

 flagella — a remarkable featui'e in the group. Its ai^pearance is 

 strikingly like that of a Heliozoon ; but as the flagella are movable 

 they are clearly flagella, and not rigid pseudopodia, like those of a 

 Heliozoon. 



* Nova Acta Acad. Leop.-Carol., xlvi. (1884), G7 pp. ("> pis.). 



