182 



"TERRA NOVA" EXPEDITION. 



8. Conchoecia antipoda, Miiller. 



Gonchoeda antipoda, Miiller, 1906a, p. 110, pi. XXVI, figs. 5-16 ; id. 1912, p. 87. 



Stations 178, 270, 276, 282, 285, 346 (Antarctic). Surface to one thousand seven 

 hundred and fifty metres. 



9. Conchoecia belgicae, Miiller. (Text-fig. 4.) 



Conchoecia belgicae, Miiller, 1906c, p. 4, figs. 1-11 ; id. 1912, p. 92. 

 Conelwecia innominata, Brady, 1907, p. l,pl. II, figs. 7-14. 



Stations 112, 136 (North of New Zealand). Surface to ten metres. Stations 172, 

 178, 235, 270, 317, 323, 343-6, 350-352 (Antarctic). Surface to six hundred metres. 



Certainly the most numerous species in the nettings of the Expedition, occurring 

 in more gatherings than any other Ostracod, and in many cases forming the bulk of the 



plankton and giving it a characteristic appearance. 

 The percentage of young in these swarms is low. 

 Thus in No. 317 fourteen per cent, were larvae, in 

 No. 112 only twelve per cent. 



Two larval stages may be distinguished. 



StaC4E II. i mean length, 2 "08 mm. (Fig. 4b.) 



Rostrum relatively slightly larger and shoulder- 

 ridge less prominent than in adult. Anterior 

 and posterior margins more evenly curved. First 

 antennae of $ type, principal bristle slightly hairy 

 in its middle one-third. 



Frontal organ, head not clearly marked oft" from 

 stem, slightly hairy below, club-shaped with acute 

 point bent slightly downwards. 



Stage III. $ mean length, 1 • 36 mm. (Fig. 4c.) 

 Shell very similar to that of Stage II. Left 

 asymmetrical gland with prominent mouth. First antennae, sense-tubes aljout half 

 as long as principal bristle. 



10. Conchoecia hispinosa, Clans. 



Conchoecia Usjiinosa, Glaus, 1890, p. 10 ; id. 1891, p. 59, pi. V, figs. 1-10, pl.VI, fig. 1, pi. VIII, 



figs. 7, 8; MuUer, 190Ga, p. 90, pi. XVIII, figs. 12-19 ; id. 1912, p. 79. 

 Conchoecia secernenda, Vavra, 1906, p. 59, pi. VI, figs. 121-127. 

 Conchoecia miilleri, Juday," 1906, p. 24, pi. V, figs. 5-7, pi. VI, figs. 1-5. 



Stations 92, 107 (North of New Zealand). Surface. Stations 235, 238 (South of 

 New Zealand). Ten to thirty metres. 



B 



Fig. 4. — Conchoecia belgicae. A, Male ; 

 B, Male, Stage II ; C, Male, 

 Stage III ; Right valves, X 25. 



* In a copy of this paper received from the author by Dr. W. T. Caiman the name, C. miilleri, has 

 been altered in manviscript to C. striola, Miiller. 



