BULLETIN: MUSEUM OF COMPARATIVE ZOÖLOGY. 
side is sometimes provided with an umbilical depression, but often with- 
out it; the poration on this side is usually obsolete, the sutures nearly 
straight, without limbation. It may be identical with Rotalia truncana 
Gime., 1868, Nordalp. Eochn, K. Bayr. Wiss. Ak., Abh. X. p. 653, Pl. II. 
Fig. 93. 
Pacific. 695-1218 fathoms; not common. 
P. Robertsoniana Brapy. 
Truncatulina Robertsoniana Br. (1881), 1884, Chall. Rep., IX. p. 664, Pl. XCV. Fig. 4. 
Is distinguished by its often wide umbilicus on the oral side, its nearly fat 
aboral side, and several narrow circumvolutions with numerous segments, 
Color usually brown or yellowish, seldom white. 
Caribbean Sea. 399-1830 fathoms; not common. 
P. reticulata CzJZEk. 
Rotalina reticulata Czsz., 1848, For. Wien. Beck., Haid. Nat., Abh. IL p. 145, PI. XIII. 
Figs. 7-9. 
Planorb. reticulata Goüs, 1882, Ret. Rhizop. Caribb. Sea, Sv. Vet. Ak. Hdl., XIX. 4, 
p. 103, Pl. VII. Figs. 242-244. 
Truncat. reticulata, Br., 1884, Chall. Rep., IX. p. 669, Pl. XCVI. Figs. 5-8. 
This exquisite form is of no rare occurrence in some localities of the Carib- 
bean Sea. 
Caribbean Sea. 300 fathoms (Goós). 
P. Ariminensis p’Ore. 
Planulina Ariminensis D'ORB., 1826, Tab. Méth., An. Sc. Nat., VII. p. 280, Pl. V. 
Figs. 1-3, bis Mod. 49. 
Planorb. tuberosa var. Ariminensis Goüs, 1882, Ret. Rhizop. Caribb. Sea, Sv. Vet. 
Ak. Hdl., XIX. 4, p. 98, Pl. VII. Figs. 228-233. 
Anomalina Arimininensis Br., 1884, Chall. Rep., IX. p. 674, Pl. XCIIT. Figs. 10, 11. 
Planorb. Arimininensis Goss, 1894, Arct. & Scand. Foramf., Sv. Vet. Ak. Hdl, 
XXV. 9, p. 91, Pl. XV. Figs. 784, 786. 
A handsome form, that has been found in a well developed state in the Carib- 
bean Sea. 
Caribbean Sea. 196-684 fathoms. 
P. rudis Girne. 
Rosalina rudis Güwn., 1808, Nordalp. Eocän, K. Bayr. Wiss. Ak., Abh. X. p. 657, PL II. 
Fig. 99. 
Anomalina grosserugosa Br., 1884, Chall. Rep., IX. p. 673, Pl. XCIV. Figs. 4, 5. 
It may be questioned whether the form represented by Brady in the Chal- 
lenger Report as Anomal. grosserugosa is quite identical with Gümbel's form of 
the same name, which seems to be rather a Truncatulina than an Anomalina, 
