136 DISCOVERY REPORTS 



it being frequent though small at St. WS 507A, while a few large specimens were found 

 at St. 386 in 4773 m. As a general rule the large form is not found at greater depths 

 than 400 m. 



At St. 167 in the South Orkneys, where the species is very common at 244 m., two 

 abnormal specimens were found, one consisted of three medium-sized individuals fused 

 together; in the other case a large individual had suffered fracture and loss of the final 

 charnbers, and had repaired the damage with a terminal chamber and aperture set at 

 right angles to the plane of growth. With these exceptions the species is remarkably true 

 to type and free from abnormalities ever5rwhere. 



287. Cassidulina crassa var. porrecta, Heron-Allen and Earland (F 161). 

 Six stations: 167, 384, 385; WS 204, 469, 482. 



Frequent at St. WS 469, very rare at the other stations. Four of the stations, 384, 

 385, WS 204 and 469, are in the very deep water of the Drake Strait, 3328-3959 m. ; of 

 the others, St. 167 is in 244 m. off the South Orkneys, and St. WS 482 is in 100 m. in 

 the Bransfield Strait. 



288. Cassidulina subglobosa, Brady (F 162) (SG 189) (Plate VI, figs. 21, 22). 



Fifty-five stations: 163, 164, 167, 170, 175, 177, 180, 190, 192, 194-7, '99' 200-3, 363, 366, 383-6; 

 62° 57' S, 60° 20' 30" W; 64° 56' S, 64° 43' W; Port Lockroy; WS 204, 205, 383, 385, 389, 391, 393, 

 395, 403, 468, 469, 474, 476, 479, 481-3, 485-7, 493, 494A, 496, 497, 505, 506, 507 A, 507B, 511. 



Generally distributed but usually more or less rare. It is, however, very common 

 though small at St. 195 in 391 m. ; large and common at St. 164 in 24 m. ; common, both 

 large and small, at St.WS 482 in 50-152 m. Excellent specimens are frequent at Sts. 170, 

 363 and 366, all of which are under 400 m. But depth does not appear to have much 

 influence except in its greater rarity, for large and excellent specimens are found in the 

 deepest water stations such as Sts. 383, 385, 386, though they are few in number. There 

 is the usual range of variation in the rotundity of specimens, but as a general rule they 

 are very typical and the flattened variety is less widely distributed than in the South 

 Georgia area. At St. 383 two specimens were found in which the two final chambers, 

 abandoning the coil system, were extended in a straight line, thus conforming with the 

 plan of growth of Cassiduliuoides. In the absence of further material I prefer to regard 

 them as abnormal specimens of C subglobosa. 



289. Cassidulina subglobosa var. tuberculata, Heron-Allen and Earland (Plate VI, 

 figs. 26, 27). 



Cassidulina subglobosa var. tuberculata, Heron-Allen and Earland, 1922, TN, p. 138, pi. iv, 



figs. 36-8. 



Cassidulina subglobosa var. tuberculata, Cushman, 1925, etc., LFR, 1925, p. 54, pi. viii, figs. 43-5. 



One station: 170. 



A single specimen from 342 m. at Clarence Island. The tubercles are smaller than in 

 the types which were from 245-268 fathoms in the Ross Sea. I know of no subsequent 

 record. 



