I04 DISCOVERY REPORTS 



1 86. Cassidulina laevigata var. tumida, Heron- Allen and Earland. 



Cassidulina laevigata var. tumida, Heron-Allen and Earland, 1922, TN, p. 137, pi. v, figs. 8-10. 

 Cassidulina laevigata var. tumida, Cushman, 1925, LFR, i, p. 54, pi. viii, figs. 40-2. 



One station : WS 66. 



Only a single and far from typical specimen. The variety was originally described from 

 off Three Kings Islands, New Zealand (North Island) at a depth of 90-300 fathoms, but 

 we have good specimens from a sounding made by the ' William Scoresby ' off Gough 

 Island (2000-3000 m.). 



187. Cassidulina pulchella, d'Orbigny (F 158). 

 Two stations: WS 27, 521. 



Extremely rare and very pauperate. Only a few specimens in all. 



188. Cassidulina crassa, d'Orbigny (F 160). 



Thirty-four stations: 20, 27, 30, 42, 45, 123, 126, 131, 136, 140, 143, 144, 148, 149, 660; WS 25, 

 27, 28, 31, 32, 33, 40, 42, 66, 113, 154, 314, 351, 418, 429, 521, 522, 523; MS 68. 



The species, though widely distributed, does not occupy the dominant position 

 which it assumes in the Falkland area and is very rare at many stations. All the forms 

 met with in the Falkland area were found, but the large typical crossa is rare, and occurs 

 only at Sts. 144, 148, 149, WS 27, 154 and 521, nearly always accompanied by the small 

 hyaline form, which is the dominant type round South Georgia and is sometimes very 

 common, especially at St. 144, WS 25, 27, 66 and 314. The intermediate type referred to 

 in the Falkland Report also occurs at several stations, notably Sts. 123, 144 and WS 33. 

 With increase of depth there is a marked tendency to decrease in size. Thus at WS 429 

 at a depth of 2549 m. the small type becomes quite minute, whereas at WS 522 and 

 523 at depths of 2550 and 1649 m. respectively the intermediate type is much reduced in 

 size while acquiring a much thicker shell. 



189. Cassidulina subglobosa, Brady (F 162). 



Thirty-eight stations: 13, 20, 30, 31, 42, 123, 126, 131, 136, 140, 144, 149, 660; WS 25, 27, 28, 

 32,33,37,40,42,43,45,47, 50, 51,63-4,66,113,154,314,348,351,418,521, 522, 523; MS 68. 



Very generally distributed but usually rare or very rare. It was, however, very common 

 at St. 144, WS 33 and 66. As a rule the specimens are small and far from typical, the 

 flattened form referred to in the Falkland Report occurring at many stations, sometimes 

 exclusively. The best specimens of the typical form were seen at St. 149, WS 33, 522 

 and 523. 



190. Cassidulina parkeriana, Brady (F 163). 



Forty-five stations: 13, 14, 16, 20, 23, 27, 30, 31, 42, 45, 123, 126, 131, 136, 140, 144, 148, 149, 

 157; WS 25, 27, 28, 32, 33, 37, 40, 42, 43, 45, 46, 47, 48, 50, 52, 63, 66, 113, 154, 314, 348, 349, 357, 

 418, 426; MS 68. 



This is the most generally distributed species of Cassidulina, but is seldom abundant 

 except at a few stations, notably St. 23 where it is very common. It is common at Sts. 



