marina_ Duj.
Family PLEURONEMIDAE.
43. _Pleuronema chrysalis_ Ehr.
44. _Pleuronema setigera_, n. sp.
45. _Lembus infusionum_, n. sp.
46. _Lembus pusillus_ Quenn.
Family OPALINIDAE.
47. _Anoplophrya branchiarum_ Stein.
Order HETEROTRICHIDA.
Family BURSARIDAE.
48. _Condylostoma patens_ Muell.
Family HALTERIDAE.
49. _Strombidium caudatum_ From.
Family TINTINNIDAE.
50. _Tintinnopsis beroidea_ Stein.
51. _Tintinnopsis davidoffi_ Daday.
Order HYPOTRICHIDA.
Family PERITROMIDAE.
52. _Peritromus emmae_ Stein.
Family OXYTRICHIDAE.
53. _Epiclintes radiosa_ Quenn.
54. _Amphisia kessleri_ Wrzes.
Family EUPLOTIDAE.
55. _Euplotes charon_ Ehr.
56. _Euplotes harpa_ Stein.
57. _Diophrys appendiculatus_ Stein.
58. _Uronychia setigera_, n. sp.
59. _Aspidisca hexeris_ Quenn.
60. _Aspidisca polystyla_ Stein.
Order PERITRICHIDA.
Family LICHNOPHORIDAE.
61. _Lichnophora macfarlandi_ Stevens.
Family VORTICELLIDAE.
62. _Vorticella marina_ Greeff.
63. _Vorticella patellina_ Mueller.
64. _Zoothamnium elegans_ D'Udek.
65. _Cothurnia crystallina_ Ehr.
66. _Cothurnia nodosa_ Cl. & Lach.
67. _Cothurnia imberbis_ Ehr.
Subclass SUCTORIA.
Family PODOPHRYIDAE.
68. _Podophrya gracilis_, n. sp.
69. _Ephelota coronata_ Wright.
Family ACINETIDAE.
70. _Acineta divisa_ Fraip.
71. _Acineta tuberosa_ Ehr.
Family DENDROSOMIDAE.
72. _Trichophrya salparum_ Entz.

* This classification includes only the orders and families
represented at Woods Hole

Genus AMOEBA Auct.

The pseudopodia are lobose, sometimes absent, the body then
progressing by a flowing movement; the body consists of ectoplasm and
endoplasm, the latter being granular and internal, the former hyaline
and external. There is always one nucleus and one vacuole, but both
may be more numerous. Reproduction takes place by division or by
spore-formation. Fresh-water and marine.

Amoeba guttala Duj. Fig. 1.

A minute form without pseudopodial processes, extremely hyaline in
appearance, and characterized by rapid flo