28 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
R. procerus Gois. 
Plate III. Figs. 1 to 5. 
Lituolina fedissima Goss, 1882, Retic. Rhizop. Caribb. Sea, Sv. Vet. Ak. Hdl., XIX. 
4, p. 138, Pl. XII. Figs. 415-418. 
Clavulina procera Goks, 1889, Dimorphism, Sv. Vet. Ak. Bihang, XV. 4, No. 2, p. 9, 
1A OE Mates 1 
R. procerus Gods, 1893, Arct. & Scand. Foramf., Sv. Vet. Ak. Hdl., XXV. 9, p. 27, 
Pl. VIII. Figs. 413-417. 
A good lot of this conspicuous form has been met with, but only in the 
Caribbean Sea. Its valvulate aperture resembles that of a Clavulina. 
Fig. 1, large specimen ; Fig. 2, oral aspect ; Fig. 3, cut through the prime 
segment; Fig. 4, pygmy form ; Fig. 5, its oral aspect. 
Caribbean Sea. 100-300 fathoms. 
R. insectus, n. 
Plate III. Figs. 6, 7. 
Irregular conic, the more mature segments subglobular, with incised sutures; 
aperture often slightly limbated or protruding; wall not very thick, built of 
middle coarse sand, its surface rough; light brown or grayish; length 5-8 mm., 
the last segment 1.5-2 mm. in diameter. Its nearest ally seems to be R. sabu- 
losus, which it somewhat resembles in shape, but is not provided with such 
thick and loosely cemented walls, and misses also the rusty colored inside layer 
that is a striking feature of the latter. 
Pacific. 772-995 fathoms; not scarce. 
R. sabulosus Brapy. 
Lituolina scorpiurus var. ammophila Gos, 1882, Ret. Rhizop. Caribb. Sea, Sv. Vet. 
Ak. Hdl., XIX. 4, p. 187, Pl. XII. Figs. 410-414. 
R. sabulosa Br. (1882), 1884, Chall. Rep., IX. p. 298, Plate XXXII. Figs. 5, 6; 
Gods, 1893, Arct. & Scand. Foramf., Sv. Vet. Ak. Hdl., XXV. 9, p. 27, Pl. VI. 
Figs. 199-202. 
A few samples of middle size have occurred. 
Caribbean Sea. 239-262 fathoms. 
R. difflugiformis Brapy. 
R. difflugiformis Br. (1879), 1884, Chall Rep., IX. p. 289, Pl. XXX. Figs. 1-5. 
R. difflugiformis Goks, 1893, Arct. & Scand. Foramf., p. 26, Pl. VI. Figs. 196-198. 
Has been found only very rarely at a few stations in the Pacific. 
Pacific. 1132-1879 fathoms; scarce. 
