16 Prot. 
PliOTOZOA. 
Amcbba villosa and Pelomyxa palustrisj Greef, a form of it was described 
formerly as Amceha sahulosa, Leidy, Delaware, Pennsylvania, New Jersey, 
Wyoming. 
Diffugia arcula, id. 1. c. p. 116, pi. xv. figs. 34-37, pi. xvi. figs. 30 & 31, 
New Jersey, Pennsylvania. Perhaps a var. of D. lobostoma, merges into 
i). globulosUf Centropyxis, and Arcella. 
Hyalosphenia tincta, id. 1. c. p. 138, pi. xx. figs. 11-18, Pennsylvania, 
New Jersey ; probably merges into H. cuneata, elegans, and papilio. 
Heleopera, id. 1 . c. p. 162. Shell compressed, ovoid, composed of can- 
cellated chitinous membrane, mouth inferior, terminal, large, transversely 
elliptical; based on Difflugia sphagni^ Leidy, 1 . c. pi. xxvi. fig. 1-11, re- 
named A, picta. H . petricola, Leidy, 1. c. p. 165, pi. xxvi. figs. 12-20, 
Pennsylvania, Now Jersey. 
Sphenoderia macrolejns, id. I, c. p. 232, New Jersey. 
Pamphagus curvus, figs. 11 & 12, near Philadelphia, ay/c?Ms, New Jersey, 
id. 1. c. p. 196, pi. xxxiii. fig. 10. 
Placocista,\di. 1. c. p. 221. Based on Euglypha spinosa^ Carter, differing 
from true EuglyphcB in having the mouth entire and possessing articulated 
spines. 
Euglypha tegulifera^ Barnard, Am. Q. Micr. Jouru. i. p. 85, pi. viii. fig. 4, 
America. 
Echinopyxis tentorium^ Barnard, and E. hemisphoerica^ Barnard, 1. c. 
p. 84, pi. viii. figs. 1 & 2, New York. 
Eudamceba, Leidy, (8) p. 300. Based ou Amoeba blattce, Biitschli, inter- 
mediate between Amoeba, and Protamoeba. 
Amoeba cellar um, Joseph, Zool. Anz. ii. p. 306, from caves in Austria, 
manner of locomotion carefully described. 
Anatomy and Physiology. 
Plurality of nuclei in an unnamed Rhizopod which is described by 
E. Maupas, 0. R. Ixxxix. p. 262, 
Structure of Radiolaria. Hertwig (7) agrees in the main with 
Hasckel’s views on the morphology of the skeleton ; also as to the 
propriety of distinguishing between the extra- and intra-capsular soft 
parts ; but he finds a greater complexity in the structure than pre- 
vious writers have done, especially in that of the membrane of the 
central capsule, and in the frequency of the occurrence of an internal 
vesicle. Four fundamental types are distinguished : (1) irregular, (2) 
spherical, (3) radial, (4) bilaterall 3 '^-symmetrical. The spherical is the 
fundamental one of the four. The modifications of the central cap- 
sule require special attention in the study of the morphology of the 
group. The primary nucleus produces a generation of small secondary 
nuclei by three methods : (1) dichotomous division, (2) loss of nucleus 
and gemmation, (3) breaking up of the nucleolus, round the pieces of 
which new nuclei are formed. The yellow cells are perhaps parasitic. 
Reproduction takes place by dichotomous fission, as in Tripyleoe and the 
compound forms, and by formation of free germs, the latter method 
