78 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
ROTALINA (Lycx.) D’ORB. 
R. Soldanii p’Ors. 
Gyroidina Soldanii D’ORB., 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 p’OrB., 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 Gois, 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 R. 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 p’Orz.. 
P. striatopunctata Ficutr. & Mott. 
2 Nautilus striatopunctatus Ficut. & Mout., 1803, Test. Microsc., p. 61, Pl. IX. Figs. a-c. 
Polystomella Poéyana D’ORB., 1839, For. Cuba, p. 55, Pl. VI. Figs. 25, 26. 
P. crispa var. Poéyana Gods, 1882, Ret. Rhizop. Caribb. Sea, Sv. Vet. Ak. Hdl., XIX. 
4, p. 116, Pl. VIII. Figs. 301, 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 vD’Ors. 
N. umbilicatula Monraeu. 
Nautilus umbilicatulus Montacu, 1803, Test. Brit., Supplem., p. 78, Pl. XVIII. Fig. 1. 
Non. umbilicatula Br., 1884, Chall. Rep., [X. p. 726, Pl. CIX. Figs. 8, 9. 
Non. umbilicatula Goks, 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 Wark. & Jac. 
Naut. depressulus WatK. & Jac., 1798, Adams’s Essays Microsc. (Kanmach ed.), 
p. 641, Pl. XIV. Fig. 33. 
Discord. vesicularis var. elegans, Gos, 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). 
