i84 DISCOVERY REPORTS 



492. Cibicides wuellerstorfi (Schwager) (F 361) (SG 306). 

 Ten stations: 383-7; WS 204, 403, 468, 469, 505. 



Four of the stations are outside or on the Antarctic convergence line, and all are in 

 deep water, 1500-4773 m. The species is frequent at Sts. 384, 385 and WS 469, rare or 

 very rare elsewhere. Curiously enough the best and largest specimens were found in 

 the BelHngshausen Sea at St. WS 505, 1500 m., in the high latitude of 70° 10' 30" S, 

 where the species was rare. 



493. Cibicides aknerianus (d'Orbigny) (F 362) (SG 307). 

 Eight stations: 180, 369, 384; WS 204, 403, 469, 474, 511. 

 Rare or very rare everywhere. 



494. Cibicides pseudoungerianus, Cushman (F 363) (SG 308). 



Twenty-one stations: 170, 190, 196, 198, 201, 202, 204, 206, 360, 363, 366, 385, 386; WS 399, 

 403, 469, 474, 480, 485, 486, 517. 



Common at St. 363 in the South Sandwich Islands, and frequent at Sts. 170, 386, 

 WS403, and 474. Otherwise very rare and often represented by single shells. The 

 records extend down to 4773 m. 



495. Cibicides grossepunctatus, sp.n. (Plate VIII, figs. 39-41). 

 Twelve stations: 170, 177, 180-2, 187, 196, 363; WS 495, 505, 506, 507 a. 



Test large, thick -walled, very coarsely perforated, inequilaterally biconvex, the dorsal 

 side being flatter than the ventral. Consisting of about three convolutions, with 8-10 

 chambers in the final convolution. All convolutions visible on the dorsal side, but 

 generally more or less obscured owing to the deposition of secondary shell substance 

 concealing the sutures. Only the chambers of the last convolution are visible on the 

 ventral side. Sutures recurved, flush or in the case of the later chambers somewhat 

 depressed; peripheral edge rounded; aperture a broad slit with recurved Hp, extending 

 from the middle of the inner edge of the apertural face over the periphery into the inner 

 edge of the final chamber on the dorsal side. Glassy when young, becoming dull with 

 growth, dead shells being white and opaque. 



Diameter up to i-o mm. or even more; thickness about 0-45 mm. 



This is a large and striking species, very noticeable owing to its coarse perforations 

 which in contrast with the dark hyaline walls look like white dots and lines. 



It is common at St. 363 in the South Sandwich Islands; thence the records run from 

 St. 170 at Clarence Island, where it is frequent, to the South Shetlands, Bransfield 

 Strait and Palmer Archipelago, becoming increasingly plentiful at Sts. 180, 181 and 182. 

 All of the foregoing stations are in comparatively shallow water, 160-500 m., but it is 

 also common at St. 177 in 1080 m. Outside this favoured area the records are few and 

 usually confined to single specimens, the water being deeper and ranging down to 

 2582 m. at St. WS495. 



Sessile and also encysted specimens were observed at St. 182. 



