BULLETIN: MUSEUM OF COMPARATIVE ZOÖLOGY. 
ROTALINA. (Lok.) DORB， 
R. Soldanii DORB， 
Gyroidina Soldanii n'Onx., 1826, Tab. Méth., An. Sc. Nat., VII. p. 278, No. 5, Mod. 36, 
G. orbicularis D'ORB., Ibid., p. 278, No. 1, Mod. 13. 
R. Soldanii »'Onn., 1846, Bass. tert. Vienne, p. 155, Pl. VIII. Figs. 10-12, 
R. Soldanii Br., 1884, Chall. Rep., IX. p. 706, Pl. CVII. Figs. 6, 7. 
R. Soldanii Goüs, 1894, Sv. Vet. Ak. Hdl., XXV. 9, p. 99, Pl. XVI. Fig. 812. 
Differs not essentially from Rot. (Gyroidina) orbicularis D'OrB., Mod. 13. 
This seems only to be of a weaker growth, provided with six to eight segments 
only in the outer convolution, while £. Soldanii usually has nine. The small 
convexity on the spiral side is in both nearly alike. In Chall. Rep., Brady has 
figured both forms, but his figures offer no characteristics for a differentiation, 
Pacific. 1200 fathoms; rare. 
Caribbean Sea, 347-1051 fathoms ; scarce. 
POLYSTOMELLA. Ors.. 
P. striatopunetata Fromm. & Mott. 
? Nautilus striatopunctatus Fromm. & Morr., 1803, Test. Microsc., p. 61, Pl. IX, Figs. ac. 
Polystomella Poéyana »'Onn., 1839, For. Cuba, p. 55, Pl. VI. Figs. 25, 26. 
D. crispa var. Poéyana Goss, 1882, Ret. Rhizop. Caribb. Sea, Sv. Vet. Ak. Hdl., XIX, 
4, p. 116, Pl. VIII. Figs. 801, 302. 
P. striatopunctata Br., 1884, Chall. Rep., IX. p. 733, Pl. CIX. Figs. 22, 23. 
Occurs rarely in a somewhat modified form in the Caribbean Sea, 
Caribbean Sea. 300 fathoms (Goés). 
NONIONINA. D'OrB, 
N. umbilicatula MoNTAGU， 
Nautilus umbilicatulus Monracu, 1803, Test. Brit., Supplem., p. 78, Pl. XVIII. Fig. 1. 
Non. umbilicatula Br., 1884, Chall. Rep., IX. p. 726, Pl. CIX. Figs. 8, 9. 
Non. umbilicatula Gos, 1894, Arct. & Scand. Foramf., Sv. Vet. Ak. Hdl, XXV. 9, 
p- 103, Pl. XVII. Figs. 823, 824. 
Is represented in “ Albatross” dredgings by two specimens only. 
Pacific, 995-1201 fathoms ; very scarce. 
N. depressula Ware. & Jac. 
Naut. depressulus WALK. & Jac., 1798, Adams's Essays Microsc. (Kanmach ed.), 
p. 641, Pl. XIV. Fig. 33. 
Discorb. vesicularis var. elegans, Gots, 1882, Ret. Rhizop. Caribb. Sea, Sv. Vet. Ak. 
Hdl., XIX. 4, p. 108, Pl. VIII. Figs. 269-271. 
Non. depressula Br., 1884, Chall. Rep., IX. p. 725, Pl. CIX. Figs. 6, 7. 
Is seldom met with in the Caribbean Sea, and always in a starved condition ; 
it has a tendency to the stelligera form of d'Orbigny. 
Caribbean Sea. 300 fathoms (Goés). 
