48 ■ DISCOVERY REPORTS 



The occurrence of the two specimens in the Drake Strait affords an opportunity of 

 naming a very distinctive Httle species, which appears to be widely distributed all over 

 the world, usually in deep water. Most of the records which can be verified are over 

 500 fathoms. My specimens are from 3328 and 4773 m. 



Genus Miliolina, Williamson, 1858 



12. Miliolina seminulum (Linne) (F 12) (SG 12). 

 Eight stations: 170, 175, 177, 180, 181, 363; WS494A, 494B. 



Moderately common at St. 180, rare at 170 and 175, very rare and often represented 

 by a single specimen at the remaining stations. The depth ranges between 160 and 

 1080 m., and the frequency is generally inversely in ratio to the depth. 



13. Miliolina vulgaris (d'Orbigny) (F 14) (SG 13). 

 Eight stations: 164, 170, 177, 181, 182, i86, 196; WS 482. 



Frequent or common, and attaining a large size at Sts. 170 and 182, rarer elsewhere. 

 These stations are in 342 and 278 m. respectively, which appears to represent optimum 

 conditions for the species, as it is neither so large nor so common in greater or lesser 

 depths. The deepest record is St. 177 in 1080 m. with two average-sized specimens; 

 the shallowest, St. 164 in 24-36 m. with one small specimen. 



14. Miliolina oblonga (Montagu) (F 15) (SG 14). 

 Six stations: 167, 175, 180, 181, 366, 385. 



Frequent at St. 167, rare or very rare elsewhere. Nearly all the specimens are of a 

 thin-walled almost cylindrical type, the chambers being fragile and readily detachable. 

 With the exception of St. 385, where only a single rather doubtful specimen was ob- 

 served in 3638 m., the stations were in shallow water with a maximum depth of 244 m. 



15. Miliolina bosciana (d'Orbigny) (F 16) (SG 15). 

 Four stations: 170, 175, 385; WS 482. 



Not uncommon at St. 170 where the specimens are typical. Single good specimens 

 at Sts. 175 and WS 482, and a single weak individual at St. 385 in 3638 m. The other 

 stations are in moderate depths, 100-342 m. 



16. Miliolina subrotunda (Montagu) (F 18) (SG 16). 

 Four stations: 363, 384; Port Lockroy; WS 482. 



Single specimens at each station, and all very small. 



17. Miliolina lamarckiana (d'Orbigny) (F 20) (SG 17). 

 One station : WS 204. 



A single small and thin-walled specimen from 3328 m. This species has a very wide 

 range both in distribution and depth. 



18. Miliolina contorta (d'Orbigny) (F 21). 

 One station: 195. 



Only a single small specimen was seen. 



