PLATE"! II 



AMCEBA VERRUCOSA. 



Lvnabva many of the segments of which were changed to brown as a result oi "iS?™"":,/"" "t"'";^^;"- 



^^ Fig™ Individual with much wrinkled ectosaro ending in a posterior mmntely papillose extremity. 



It exhihSed ttaee persistent longitudinal lines. The endosaro contains a discoid nucleus and two con- 



LrtOe vesiclS &a^^^^^ united before collapse and three afterwards appeared m the same position. 



FIG a ^ individual nearly like the former, but exhibiting no longitudinal lines. ■ 



FIG 3 aS indi^dual with tonv longitudinal lines, a small nucleus, and large contractile vesicle. 



F G 4 aS ndi^dual which when first observed looked nearly like the former, but which subse- 



quentlv d scharged the large pouch-like drop of' yellowish Uquid and ^^"^^"""l^fe^.f f^*^fX l/'^i; 



bya Many of the latter were at first green, and the surrounding hquid when within the body ot the 



.nimal a^so i^,Pf„«^^- S--^,f-,,,,ed from moss growing in the crevices of the brick pavemeirt of 

 my house iii Philadelphia; found in association with the Wheel-animalcule, JJofe/e^ toJ^o™, June, 1874. 



^ Fig 5. Individual comparatively quiescent, with nucleus and contractile vesicle. 



Fig 6 Individual with nucleus and food, but the contractile vesicle collapsed or absent. 



Fig' 7' Individual with nucleus, two contractile vesicles, and food-balls. , ^ ^1 



Fig 8. Small individual. It moved quickly with the^broad etid forward. Several contractile 

 vesicles would appear, conjoin in a single one and then collapse. Frequent form m the bog at the toot 

 of the Zoological Garden, Philadelphia, June, 1878. ^^ , ., ., ^ ^. ^-i ■ i^o w-hi„i, mi 



Fig 9 SmaU individual with active movement. It exhibits five contractile vesicles which all 

 conjoined'in one before collapse. 500 diameters. Frequent in bog-water, Broad Mountain, Schuylkill 



°"^ Fig?10.^ An individual widely spread and exceedingly sluggish in movement ; with a nucleus and 

 contractile vesicle. 686 diameters. „ , „ , n ■ ■ 



Fig 11 The same individual, magnified half the extent of the former, as observed swimming. 

 From the pavement at the fountain in Sont of the City HaU, on Market street, Philadelphia. 



Fig 12 Individual with three longitudinal lines. It contains a nucleus, two contractae vesicles, 

 together with fragments of Lyngbya, and a diatom. 333 diameters. Fountain in Fairmount Park, 



Fig. 13. An individual with four longitudinal lines. It shows two contractile vesicles, of which 

 the larger is in the act of collapse. With the preceding. 333 diameters. 



Fig. 14. An individual with five or six longitudinal lines. The contractile vesicle m the act of 

 collapse. 500 diameters. With the preceding. . , , r .. 



Figs. 15, 16. Two views of an individual, with four longitudinal Unes. A variable number ot 

 small contractile vesicles would appear as seen in fig. 15, conjoin as in fig. 16, then expand to a regular 

 sphere and collapse. Fort Bridger, Wyoming Territory, August, 1877. 



Fig. 17. Individual with two longitudinal lines. The contractile vesicle nearly collapsed. Same 

 locality. 



Fig. 18. Individual with four longitudinal lines. It contains a nucleus, many clear vacuoles 

 (inadvertently colored by the lithographer), and at the posterior extremity a large contractile vesicle. 

 Common in Swarthmore brick-pond. 



Figs. 19-27. Xoung forms, observed among green algous material, Lyngbya, etc., scraped from 

 the brick pavements in damp shaded places in Philadelphia, and preserved a few days in a dish with 

 water. SmaU actively moving individuals, exhibiting mostly two to four longitudinal, lines or folds, 

 containing a nucleus and a large posterior contractile vesicle. 500 diameters. 



Fig. 28. Mature form, found with the preceding. 500 diameters. 



Fig. 29. Mature form. Found in association with those of figs. 5-7. 333 diameters; 



Fig. 30, Individual containing a nucleus, contractile vesicles, and food consisting of yellowish 

 and colorless granular balls, a diatom, and grains of sand. 500 diameters. Marsh of the Uinta Mount- 

 ains, Wyoming Territory, August, 1877. 



Fig. 31. Individual, with nucleus, and large contractile vesicle (to left of the middle). The food- 

 contents consist of abundance of the alga Lyngbya. The large posterior vacuole, with the greenish liquid 

 and numerous isolated segments of Lyngbya, was observed to be expelled. 500 diameters. Among the 

 algous slimeatthebaseofthe fountain. Eleventh streetnearChestnutstreet, Philadelphia, September, 1876. 



Fig. 32. Individual, from among Osoillaria and other algae preserved during the winter, observed 

 with others of same character, February, 1875. 



Fig. 33. Individual of sluggish habit, with discoid nucleus, contractile vesicle, and food-balls. 

 200 diameters. Swarthmore brick-pond. 



Fig. 34. Individual of exceedingly sluggish habit. With large discoid nucleus, contractile 

 vesicle, and food-balls. 500 diameters. Sphaguous swamp of Vineland, New Jersey, September, 1876. 

 The contractile vesicle from its first appearance to its greatest expansion required about ten minutes ; 

 its collapse, about six seconds. ^ 



Fig. 35. An almost motionless individual, without conspicuous contents except the contractile 

 vesicle, which was observed to collapse and reappear. 500 diameters. Fort Bridger, Wyoming Terri- 

 tory, August, 1877. 



Fig. 36. Individual, with oval nucleus, contractile vesicle (to the right), and food-balls (errone- 

 ously colored). 200 diameter?. From ooze on the rocks below Fairmount, Philadelphia, October, 1875. 



FiG. 37. Small active individual, found with the preceding. 



Fig. 38. Large sluggish individual, found with that of fig. 34. Besides the oval nucleus, and large 

 contractile vesicle, it contained a Difflugia constriota and a Tiinema enchelys. 500 -J-; 



