ROTALIIDAE i8i 



475. Discorbis globularis var. anglica, Cushman (SG 295). 

 One station: 164. 



A single specimen of this wild-growing variety. 



476. Discorbis vilardeboanus (d'Orbigny) (F 333) (SG 297). 

 Nine stations: 164, 170, 175, 177, i8o, 190, 201 ; WS 481, 482. 



Common at St. 190, and frequent at Sts. 170, 175 and WS 482; elsewhere very rare. 



477. Discorbis peruvianus (d'Orbigny) (F 335). 

 Three stations : 175, 177, 180. 



Frequent at St. 175 in 200 m., very rare at the other stations. 



478. Discorbis rosaceus (d'Orbigny) (F 334) (SG 298). 

 Seven stations: 195, 199, 363; Port Lockroy; WS 199, 389, 482. 

 Very rare everywhere and small. 



479. Discorbis turbo (d'Orbigny) (F 339). 

 One station: 198. 



A single good specimen from 1600 m. in the Bransfield Strait is the only record. But 

 for the fact that the species occurs frequently in the Falkland area its occurrence would 

 be open to suspicion as a "stray" from foul gear. 



480. Discorbis translucens, sp.n. (Plate VIII, figs. 20-22). 

 One station: 385. 



Test trochoid, plano-convex, the dorsal side a high cone with rounded apex, ex- 

 hibiting about three convolutions with four chambers in the final convolution. Sutures 

 flush and inconspicuous, peripheral edge acute and slightly lobulate. The ventral side 

 flattened and rather concave, the umbilical portion showing weak asterigerine folds. 

 Aperture normal, very inconspicuous. Test hyaline-white, translucent when wet, and 

 very finely perforated. 



Diameter 0-20 mm.; height o-io mm. 



Three specimens of this pretty little form were found at St. 385 just on the con- 

 vergence in the Drake Strait, depth 3638 m. It is unlike any species with which I am 

 acquainted, but evidently allied to the group of D. turbo. 



481. Discorbis bertheloti (d'Orbigny) (F 345). 

 Three stations: 170, 385, 387. 



Rare at St. 170 in 342 m.; very rare and small at the other stations, 385 and 387, 

 which are in the deep water of the Drake Strait, 3102-3638 m. 



482. Discorbis chasteri (Heron-Allen and Earland) (F 352) (SG 299). 

 Two stations: 363 ; WS 482. 



Extremely rare at both stations. 



483. Discorbis parisiensis (d'Orbigny) (F 349). 

 Three stations: 164, 170, 177. 



Rare at St. 170, single specimens at the other stations, all small. 



