IDENTIFICATION OF SPECIES 211 



also of the British Museum, for his help with the Copepoda, a group that involved a great deal of 

 work. Mr P. M. David of the National Institute of Oceanography examined the Chaetognatha and 

 has been of assistance on several occasions, and Dr J. E. Morton of Queen Mary College has kindly 

 examined the Mollusca. Dr T. J. Hart, as well as contributing a large part of this paper, has given me 

 assistance with the Amphipoda. Mr N. B. Marshall of the British Museum has kindly read a draft of 

 the paper and made some helpful comments. Finally I would like to thank Dr N. A. Mackintosh 

 for his general guidance during this work. 



The following is a list of genera and species identified : 



Siphonophora 



Diphyes antarctica Moser 

 Dimophyes arctica (Chun) 

 Pyrostephos vanhoffeni Moser 



Anthomedusae 



Sibogita borchgrevinki E. T. Browne 



POLYCHAETA 



Vanadis antarctica (Mcintosh) 

 Tomopteris spp. 



Chaetognatha 



Sagitta gazellae Ritter-Zahony 

 S. planctonis Steinhaus 

 Eukrohnia hamata (Mobius) 



Echinodermata 



Auricularia antarctica MacBride 



Ostracoda 



Conchoecia hettacra Miiller 



Copepoda 



Calanus acutas Giesbrecht 

 C. propinquns Brady 

 C. simillimus Giesbrecht 

 Rhincalanus gigas Brady 

 Pleuromatnma robusta (F. Dahl) 

 Metridia gerlachei Giesbrecht 



Copepoda (cont.) 

 Haloptilus ocellatus Wolfenden 

 H. oxycephalic Giesbrecht 

 Pareuchaeta antarctica Giesbrecht 

 Euchirella rostromagna Wolfenden 

 Heterorhabdus austritius Giesbrecht 

 Candacia spp. 



Amphipoda 



Parathemisto gaudichaudi (Guerin) 

 Primno macropa Guerin 

 Vibilia antarctica Stebbing 

 Eusirus antarcticus (Thomson) 

 Cyllopus spp. 



Euphausiaceae 



Euphausia superba Dana 



E. frigida Hansen 



E. triacantha Holt and Tattersall 



Thysanoessa spp. 



Mollusca 



Cleodora sulcata (Pfeffer) 

 Limacina helicina (Phipps) 

 L. balea Moller 1 



Spongiobranchea australis d'Orbigny 

 Clione antarctica E. A. Smith 



Tunicata 



Salpa fusiformis f. aspera (Chamisso) 



The samples (or the notes made by those who had already analysed them) were examined for the 

 presence or absence of the genera and species on the above list. It will be seen that four organisms are 

 listed only by generic names. These have little real value compared with identified species but 

 nevertheless it seems worthwhile to include them as they appear to have a circumpolar distribution 

 when grouped as genera. In the samples examined these genera are probably represented by, at most, 

 two species each. Two common species of Tomopteris occur in the Antarctic, T. carpenteri and 

 T. septentrionalis. It is not easy to separate them except when the former is adult. Thysanoessa spp. 

 includes Th. macrura and Th. vicina, and again no attempt has been made to separate these two owing 

 to the difficulty of distinguishing the younger stages ; Cyllopus spp. includes C. lucasii and C. magel- 

 laniais; these are only easily distinguishable when fresh. Candacia spp. possibly includes more than 



1 Dr J. E. Morton suggests that this is better referred to as L. retroversa balea (Fleming). The two forms intergrade very 

 closely. 



