HYDROIDA II 



161 



It might be supposed that Nutting's material of Campanularia Integra was restricted to 

 some few colonies from scattered localities, each representing accidental variant groups, since the 

 species is distributed under four separate names. The above indication of the methods pursued, how- 

 ever, taken together with the following statement, will give a good idea as to the cause (Nutting 

 1915 p. 34): "It should be understood moreover, that the present writer repudiates the idea that occas- 

 ional intergradation in these low forms is sufficient ground for uniting species that are usually and 

 perfectly distinguishable". 



Giard (1899) has pointed out that the gonophores in Campanularia Integra break away during 



joo m. 600 m. ._ looo m. 2000m. 



Fig. L.XXXIII. Distribution of Campanularia integra in the Northern Atlantic. 

 In the hatched regions a common occurrence is stated. 



part of the breeding season as defective medusae, but are otherwise sessile. The correctness of this 

 observation has been doubted, but is further confirmed through the investigations of Behuer (1914). 

 This writer refers to the species investigated as Campanularia compressa Clark, but it is impossible 

 to discern wherein the difference between that species and Campanularia Integra should be supposed 

 to lie. The species thus stands with one foot in each of the two old genera Campanularia and Clytia. 

 Nutting grasps at this as a welcome opportunity of separating off yet another genus, Orlypyxis, and 

 believes to have rendered the system clearer and easier to deal with thereby. 



Campanularia integra is a purely cosmopolitan species, which prefers the upper part of the 

 littoral region, but may nevertheless occassionally be met with a good way down in the abyssal, 

 exhibiting thus, apart from its enormous power of variation, a high degree of elasticity with regard 

 to temperature. In respect of salinity, on the other hand, it appears to be more susceptible, and does 



The Ingolf-Expedition. V. 7. 21 



