468 Prof. Wyville Thomson on some of the Results of 





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Pisces 



Cephalopoda 



Grasteropoda. 

 Lamellibranchiata. 

 Brachiopoda. 

 Tunicata. 

 Pycnogonidas 



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Schizopoda. 

 Stomatopoda. 



Edriophthalinata 



Phyllopoda. 

 Ostracoda. 



Copepoda 



Cirripedia. 



Annelida 



Gephyrea 



Bryozoa 



Holothuridea 



Echinoidea 



Ophiuridea 



Asteridea 



Orinoidea. 



Hydromedusse 



Zoantharia 



Alyonaria 



Porifera 



JRhizopoda 



Although there are certain points which have yet to be worked out in 

 detail, the general distribution of temperature in the Pacific seems 

 sufficiently simple. In the first place, the whole mass of water consists 

 of two well-marked divisions — an upper layer of no great depth, in which 

 there is rapid cooling from the surface downwards, and considerable 

 variation in temperature in different localities ; and a mass of water of 

 incomparably greater amount, which extends to the bottom, and which 

 may be said to have nearly the same temperature throughout. These 

 two divisions shade into one another; but the isothermobath of 5°C. may 

 be taken as indicating generally the limit between them ; below this line 

 the isothermobaths are still affected by surface thermal conditions, but 

 comparatively slightly. Above the line of 5° C. the course of the isother- 

 mobaths is to all appearance entirely regulated by causes affecting the 

 surface-temperature — that is to say, directly or indirectly, by surface cur- 

 rents produced by permanent, periodic, or variable winds. The equatorial 

 current occupies the region of the trade-winds, approximately from 

 lat. 20° N. to 20° S., and there is a strong but narrow counter current, 

 entirely comparable with the counter current in the Atlantic between 

 the parallels of 5° and 8° JN". The water of the equatorial current has 



