ás vezes simulando ele ser completamente 
réto. 
Dimensões -Comprimento total 250 4; 
comprimento do prolongamento caudal 60 w; 
largura da parte cilindrica 45 wu. 
Habitat - Atlantico Sul, imediações de 
Mar del Plata. 
II. Phytoplancton. 
Dinoflageliata. 
3—Dinophysis homunculus Stein, 1883. 
4—Dinophysis ovum Schuett, 1895. 
5—Glenodinium trochoideum Stein, 1883. 
6—Diplopsalis lenticula Bergh, 1881. 
7-Peridinium conicum (Gran, 
Gran. 
s—Peridinium depressum Bailey, 1885. 
9— Peridinium divergens Ehrenberg, 1840. 
10—Peridinium oceanicum Vanhoeffen, 
1897. 
var. oblongum Aurivillius. 
1900) | 
141 ——- 
11— Peridinium obtusum (Karsten, 1906) 
Fauré — Fremiet. 
12— Peridinium pentagonum (Gran, 1900) 
Gran, 
13—Ceratium furca (Ehrenberg, 1859). 
14—Ceratium fusus (Ehrenberg, 1833) 
Dujardin. 
15—Ceratium tripos (Mueller, 1781). 
Bacillariophyta. 
16— Paralia sulcata (Ehrenberg, 1837). 
17—Stephanopyxis appendicula  Ehren- 
berg, 1854. 
18 — Skeletonema costatum (Greville, 1866). 
19—Lauderia glacialis Gruenow, 1884. 
20 — Leptocylindrus danicus Cleve, 1889. 
21 — Guinardia flacida Castracane, 1886. 
22 — Coscinodiscus excentricus Ehrenberg, 
1836. 
23- Coscinodiscus radiatus Ehrenberg, 
1839. 
24 - Actinoptychus splendens (Ehrenberg, 
1844). 
25 — Actinoptychus vulgaris Schumann. 
26 — Rhizosolenia alata Brightwell, 1858. 
var. genuma Gran, 1911. 
var. indica  Peragallo, 
1892. 
27 — Rkizosolenia calcar-avis Schultze, 1858. 
28 — Rhizosolenia robusta Normann, 1861. 
29 — Rhizosolenia schrubsolei Cleve, 1881. 
30 — Rhizosolenia setigera Brightwell, 1858. 
31—Bacteriastrum furcatum Schadb., 1854. 
32— Chaetoceras contorctum Schuett, 1888. 
33 — Chaetoceras curvisetum Cleve, 1889. 
34 — Chaetoceras didymum Ehrenberg, 1845. 
35 —Cheetoceras holsaticum Schuett, 1895. 
36 — Chaetoceras laciniosum Schuett, 1894. 
37 — Chaetoceras pelagicum Cleve, 1873. 
38 — Chactoceras schuetti Cleve, 1894. 
39 — Chaetoceras subtile Cleve, 1896. 
40 — Chaetoceras weissfloegii Schuett, 1895. 
41 -- Hemiaulus sinensis Greville, 1865. 
42 — Cerataulina bergonii Peragallo, 1890. 
43—Biddulphia favus (Ehrenberg, 1839) 
v. Heurck. 
44—Biddulphia mobiliensis (Bailey, 1850) 
Gruenow. - 
