76 DISCOVERY REPORTS 



Mysidacea. Mollusca. 



Antarctomysis sp. Cleodora sulcata (Pfeffer). 



Limacina helicina (Phipps). 



Euphausiacea. L. balca, Moller. 



Euphausia superba, Dana. Spongiobranchaea australis, d'Orbigny. 



E.frigida, Hansen. Clione antarctica, E. A. Smith. 



E. crystallorohhias, Holt and Tattersall. T 



„ . , „ . , m ,, LUNICATA. 



E. triacantha, Holt and Tattersall 



E. vallentini, Stebbing 



Thysanoessa spp. Chaetognatha 



Salpa fusiformis f. aspera (Chamisco). 



Each of the above species and genera, and the group Chaetognatha will be treated in 

 this paper as a separate unit. The specimens of Solmiindella are likely all to be S. 

 mediterranea. Specimens of Haloptiliis, apart from H. ocellatus, may include H. oxy- 

 cephalic and possibly others. Pareuchaeta sp. is generally P. antarctica, but may include 

 P. biloba. Heterorhabdus sp. probably includes only H. austrinus. Some specimens of 

 Eucalanus have been identified as E. acus, and some of Euchirella as E. rostromagna. 

 Candacia sp. may include more than one species. The identity of Eusirus antarcticus 

 has not been determined with absolute certainty. Cyllopus spp. includes C. lucasi and 

 C. magellanicus, and Thysanoessa spp. includes T. macrura ; Antarctomysis is probably 

 A. maxima. There are two common Antarctic species of Tomopteris, T. carpenteri and 

 T. septentrionalis. When adult the former can always be distinguished from the latter 

 by its greater size, but the identification is otherwise difficult. Those distinguished in 

 this paper as "large Tomopteris" are nearly always T. carpenteri, and those included 

 under "small Tomopteris" are generally T. septentrionalis, but may include an unknown 

 proportion of immature T. carpenteri. The vast majority of the Chaetognatha are 

 Eukrohnia hamata, but Sagitta gazellae, S. maxima, and S. planctonis occur in small 

 numbers. Naturally those units identified only as genera or as a group have little value 

 compared with those identified as species, but nearly all of them occur only in small 

 numbers. Only Thysanoessa and the Chaetognatha appear in large numbers, but im- 

 mature specimens, especially of the former, make up so high a percentage of these two 

 units that complete specific differentiation would have been very difficult, and would 

 have greatly prolonged the period occupied in the analysis of the samples. 



For description of the species shown in the above list the following authorities may 

 be consulted. 



Moser (1925): Diphyes antarctica, Pyrostephos vanhoffeni. 



Chun (1897): Dimophyes arc tic a. 



Browne (1910): Sibogita borchgrevinki. 



Benham (1921): Vanadis antarctica. 



MacBride (1912, 1920): Auricularia antarctica. 



Wolfenden (1908): Calanus acutus, C. propinquus, C. simillimus, Metridia gerlachei. 



Schmaus and Lehnhofer (1927): Rhincalanus gigas. 



Sars (1903): Pleuromamma robust a. 



Wolfenden (1911): Haloptiliis ocellatus. 



Barnard (1932): Parathemisto gaudichaudi. 



