GOES: FORAMINIFERA. 2h 
RHABDAMMINA M. Sars. 
R. abyssorum Sars. 
R. abyssorum M. Sars, 1868, Det Dyriske Livs Udbredning i Havets Dybder, Chris- 
tiania Videnskab. Selskab. Forhandl., 1868, p. 248. 
R. abyssorum Br., 1884, Challeng. Rep., LX. p. 266, Pl. XXI. Figs. 1-8, 10-13. 
R. abyssorum Gos, 1893, Synops. Arct. & Scand. Rec. Mar. Foramf., Sv. Vet. Ak. 
Hdl., XXV. 9, p. 19, Pl. IV. Figs. 67, 68. 
The typical forms from Norwegian seas, with long, narrow, and even arms, 
are more seldom met with; often the arms are thicker and shorter, sometimes 
varicously uneven. 
Pacific. 2° 34’ Lat. N.; 82° 29’ Long. W.; 1201 fathoms. 
Caribbean Sea. 100-900 fathoms; not plenty. 
ALLIED Forms: — 
1. R. discreta Brapy. Plate I. Figs. 13, 14. 
R. discreta Br. (1881), 1884, Challeng. Rep., IX. p. 268, Pl. XXII. Figs. 
7-10. 
Arms more or less varicous by aspurious segmentation, or annulated by 
closely arranged circular impressions. Single arms are mostly met with, 
complete specimens with 3-4 arms but seldom occurring; the channel of 
the arms provided with slight impressions; their length and thickness very 
variable. The wall is usually firmly agglutinated and hard, but occa- 
sionally more brittle specimens are met with, constructed by fine whitish 
sand. 
Fig. 13, small brittle form; Fig. 14, same, constructed of sand and 
sponge spicules, 
Pacific. 772 fathoms. 
Caribbean Sea. 200-1345 fathoms. 
The whitish more brittle form, Caribbean Sea. 211 fathoms. 
2. R. linearis Brapy. 
R. linearis Br., Challeng. Rep., IX. p. 269, Pl. XXII. Figs. 1-6. 
Very little distinguishable from the preceding but for its globular or 
ovoid chamber near the middle of the tube, which is provided with a spu- 
rious segmentation like that of the preceding form. Both are to be con- 
sidered as retarded or emaciated forms of abyssorum. 
Caribbean Sea. 211-940 fathoms; scarce. 
3. R. irregularis Carp. 
R. irregularis Carv., 1881, The Microscope, p. 562. 
R. irregularis Br., 1884, Chall. Rep., IX. p. 267, Pl. XXI. Fig. 9. 
Arms often dichotomous branching, at their outset often slightly arcuated. 
Attains not seldom 1-14 inches in length. 
