ASTRORHIZIDAE 73 



long, which I figure, has a well-marked and pointed proloculus formed of chitin with 

 ferruginous cement. A single specimen from St. 362 in the deep water of the Scotia 

 Sea (3370 m.), also figured, is attributed with doubt to this species. Its oval chitinous 

 proloculus is followed by a similar chamber before the conical agglutinate shell begins 

 to be formed. The specimen is only 0-3 mm. in length. 



111. Jaculella obtusa, Brady (F 70) (SG 78). 



Twelve stations: 169, 177, 181, 196; WS 384, 469, 471, 479, 494A, 497, 517, 553. 



Widely distributed all over the area, but except at St. 181 in the Palmer Archipelago, 

 where it is frequent in 160-335 ^■■> the species is rare. Most of the records are below 

 1000 m., and fragments were found in the Weddell Sea at WS 553 in 5029 m., the 

 deepest sounding received. The best and largest specimens were obtained at Sts. 196, 

 WS 469, 494A. 



Genus Hippocrepina, Parker, 1870 



112. Hippocrepina oviformis, Heron-Allen and Earland (SG 80). 

 Two stations: 163 ; WS 510. 



A single good specimen at each station. 



113. Hippocrepina flexibilis (Wiesner) (SG 81). 

 Three stations: 190; WS 202, 485. 



A single specimen at each station ; that from St. WS 202 in the deep water of the 

 Scotia Sea, 3987 m., is much larger than usual. All of them are more or less collapsed 

 owing to the thinness and flexibility of the test. 



Genus Hippocrepinella, Heron-Allen and Earland, 1932 



114. Hippocrepinella hirudinea, Heron-Allen and Earland (SG 82). 

 Three stations: 164, 181, 209. 



The rarity of this species, which is so common at some stations in South Georgia, is 

 noteworthy. The records are confined to shallow water in the South Orkneys, South 

 Shetlands and Palmer Archipelago ; a single small specimen at St. 209 and very rare at 

 the other stations. The specimens are rather more thick-walled than usual, especially at 

 St. 164, but are otherwise quite typical. 



The species is not uncommon in a dredging made by the Irish Fisheries cruiser 

 ' Helga' in 982 fathoms off south-west Ireland (Haul SR 944, 51° 22' 30" N, 12° 38' W). 

 The material used in construction is very fine sand instead of mud, and the resultant 

 test is light coloured and more friable than the South Georgia type. 



115. Hippocrepinella alba. Heron- Allen and Earland (SG 84). 

 Four stations: 167, 177; WS 384, 385. 



The single specimens found at Sts. 177 and WS 385 in the Bransfield Strait, at depths 

 of 1080 and 1838 m. respectively, were regularly fusiform with an aperture at each end. 

 The walls were not collapsed. The species is more frequent at St. 167 in the South 

 Orkneys, 244-344 m., and the specimens illustrate the wide range of size and form 



