ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 263 



great abundance. For this the new genus Philaster is founded, and 

 the species is named P, digitiformis. It is allied to ParamcBcium, 

 from which it differs, however, in general form and in the possession 

 of a long, rigid anal cilium. (6) A magnificent species of Nassula 

 (hrunnea nov. sp.) was found, characterized by its large size and its 

 diatomine-like brown colour, and distinguished from other species by 

 the absence of a pre-buccal furrow, by its long, cylindrical, terminally 

 rounded, somewhat S-shaped nucleus, by its simple contractile vesicle, 

 &c. (c) Pleuronema marina Duj. is described ; the pharynx is not 

 turned upwards, as has been hitherto figured ; in the peripheral layer, 

 below the outer membrane, trichocyst-like rods were seen ; the con- 

 tractile membrane is, when fully extended, almost as large as the body • 

 proper, {d) A new species of Lemhus (striatus) was especially 

 characterized by the very fine, diatom-like, transverse as well as 

 longitudinal, striation of its vibratile membrane, (e) A new genua 

 Certesia is established for a form distinguished by its twelve lateral, 

 and its enormous transverse setae, as also by the restriction of the 

 marginal setse to one side of the body. In the development of 

 marginal setje it approaches the Oxytrichidse, while it resembles the 

 Euplotidse in its consistence and in the horseshoe-shaped arrangement 

 of its nuclei. In front, just below the anterior end, there is a 

 peculiar, small, membranous plate, rounded, transparent, and capable 

 of slight movements. In this form (C. quadrinucleata) the contractile 

 vesicle seems to be absent. (/) A new species of Aspidisca is named 

 crenata, on account of the bluntly toothed contour of the posterior 

 margin of a clear tegumentary fringe which surrounds the body. 

 (g) A very full description of Styloplotes appendiculatus Ehr. is given, 

 and, in correction of Maupas, the presence of a contractile vesicle and 

 of prebuccal cilia is maintained. 



Microthorax auricula.* — M. P. Fabre-Domergue describes thia 

 new species of the hypotrichous infusorian Microthorax, which has 

 been found in a cultivation of algse from the Seine ; the specific 

 name is due to its remarkable ear-like form. It is C 03-0 • 04 mm. long, 

 has a depressed, reniform, non-contractile body about twice as long as 

 wide ; the cilia, which are confined to the ventral surface, are delicate 

 and rigid, separated by a somewhat considerable space about 10 /a long 

 at either end and 8 /x long on the rest of the body. M. auricula runs 

 about on its ventral surface among the algee on the decomposition of 

 which it lives. It differs from the two species described by Engel- 

 mann — M. sulcatus and M. pusillus by wanting the dorsal groove, and 

 by possessing a semicircular and three posterior bourrelets. 



New Rhizopod.t — M. P. Hallez describes a new Ehizopod — 

 Arcyothrix Balhianii — found in cultures of the eggs of Ascaris mega- 

 locepliala. Its irregular globular body has a flattened " pedal-disc " ; 

 from the body two varieties of pseudopodia are given off: a single 

 blunt process, which serves to seize prey, and two long, delicate 

 filaments, which hold the prey. The locomotion is not assisted 



* Ann. Sci. Nat.— Zool., xix. (1885), No. 6., 1 p. 



t Mem. Soc. Sci. Lille, xiv. (1885) pp. 323-5. Of. Bull, Sci. Dep. Nord, 1885. 



