LISTS OF SPECIES BY STATIONS 



53 



The tLMiipcaitiire fell 5° in the 100 iiieters; the saliiiiu- and 

 Indrogen-ion concentration changed very little. The 50-meter 

 tow was four times the vokinie of the surface tow although 

 less than half as long, and it was twice the volume of the 100- 

 nieter tow, but only three-fifths as long. Hence, as would be 

 expected, the species were erratically distributed at the three 

 depths, 19 at the surface, 50 at SO meters, and 44 at 100 

 meters. Fort\'-thrce species (60 per cent) were each confined 

 to a single depth and 7 were found at all three depths. 



Corycaciis, Eiicala)iiis. ami Oncncci were ai;ain well represented 

 in species, especially in the two deeper tows, but Candacia 

 was entirely absent. The 100-metcr tow has the only record 

 for Arielellus setosus and one of the few for Augaplilus longi- 

 caudatus. Haloptilus, Heterorhabdiis, and Iletcrostylites were 

 confined to the 100-meter tow. Although Paracalanus parvus 

 was recorded as abundant at all three depths, the actual 

 number of specimens was much larger in the 50-mcter tow 

 than in either of tlie others. 



Station 43 

 November 15, 1928; 2° 30' S, 95° 43' W; bottom depth, 3352 m; 71 species 



Depth of tow, m 

 Temperature, °C 

 Salinity, o/oo 

 \'ohimc of tow, cm' 



Acartia danae 



negligcns 



Acrocalanus gibber 



gracilis 



Calanus minor 



propinquus 



Canthocalanus pauper 



Centropages violaceus 



Clausocalanus arcuicornis 



furcatus 



Corycaeus agilis 



andrewsi 



catus 



crassiusculus 



dubius 



flaccus 



speciosus 



typicus 



Danodes plumata, n. gen. and n. sp. 

 Eucalanus attenuatus 



crassus 



clongatus 



monachus 



mucronatus 



subtcnuis 



Euchaeta acuta 



marina 



Euchirella pulchra 



Farranula gibbula 



gracilis 



rostrata 



Haloptilus longicornis 



Labidocera detruncata . . . 



Lubbockia squillimana 



Lucicutia clausii 



Mecynocera clausi 



Id' 



a 



a 

 f 



r 



29 



f 

 2 

 f 

 3 

 r 



r 



r 



r 



c 



r 



lo^ 



3 



f 



f 

 f 

 Icf 



2 



1 



1 

 1 



Megacalanus longicornis . 

 Microcalanus pygmaeus. 



Microsetella rosea 



Neocalanus gracilis 



robustior 



tenuicornis 



Oithona attenuata 



plumifera 



siniilis 



spinirostris 



Oithonina nana 



Oncaea conifera 



curta 



media 



mediterranea 



minnta 



notopa 



siniilis 



subtilis 



tenella 



venusta 



Paracalanus parvus 



pygmaeus 



Phacnna spinifera 



Pleuromamma gracilis. . 



Pontella danae 



Pontellina plumata 



Pontellopsis regalis 



Pseudocalanus minutus. 

 .Sap[)hirina auronitens. . 



nigromaculata 



Scolecithricella bradyi . . 

 Spinocalanus abyssalis. . 

 Undinula caroli 



darwinii 



1 

 3 



f 

 2 

 4 

 19 



r 

 a 

 f 

 4 

 1 

 f 

 c 



f 

 f 



a 

 c 

 3 



19 



1 



c 

 r 



4 

 1 

 1 



The temperature fell 6° in the 100 meters; the salinity and 

 hydrogen-ion concentration changed but little. The surface 

 tow was 50 per cent longer than either of the others and its 

 volume was five times as great. Twenty-five species were taken 

 at the surface, 53 in the 50-meter tow, and 44 in the 100- 

 meter tow. Almost exactly half the species were each confined 

 to a single level, and 14 were present at all three levels. 

 Corycaeus, Eucalanus, and Oncaea were more numerous in 



species and more abundant in individuals than at the preced- 

 ing station. The two former were especially evident in the 

 50-nieter tow, the latter in all three tows. Paracalanus was 

 much less abundant than at station 42, especially in the two 

 deeper tows. Two specimens of the new genus Danodes were 

 taken in the surface tow, but it is apparently nowhere abun- 

 dant. Of the 25 species taken at the surface, those of Clauso- 

 calanus, Paracalanus, and Pseudocalanus were abundant. 



