352 P- Kramp. 



A glance at table 2 will show that, excluding some sparsely 

 represented athecate families, all the families have representatives at 

 practically all depths below 200 meters. With the help of this table 

 we may also compare the bathymétrie occurrences of the different 

 species within each single family or genus. Thus, Sertiilarella gi- 

 gantea lives in deeper water than S. tricuspidata, and Campanularia 

 groenlandica is the only one of the Campanidaria species found here 

 which mainly occurs in deeper water. 



hi table 3 the species are arranged according to the depth 

 of water at which they were taken by the Danmark Expedition. In 

 table 4 they are arranged according to the shallowness of the 

 water in which they were found. It will be easy to grasp the ar- 

 rangement in detail; where the conditions are the same, regard is 

 taken of the frequency. When species are arranged according to 

 their bathymétrie occurrence, it is usual to employ one of these or 

 similar methods. The methods are not without value; it may be of 

 great interest to see what species can occur in this or that shallow 

 or deep water, but as above remarked, the statements are only reli- 

 able for the more abundant species. I have nevertheless included 

 here the rare species in order to emphasize the advantage of the 

 method used in table 5. A comparison of the tables 3 and 4 will 

 immediately show, that the order of the species is widely different 

 and that the species which occur at the shallowest depths are in 

 great part the same as those found in greather depths; and that 

 tables such as these say nothing as to what depths the single species 

 belong to. To gain information about this we must examine into 

 the relative abundance of the species at the different depths and 

 judge from thai the depth it really belongs to. 



The result of my iuAestigation in this direction is represented 

 in table 5. — (Àdgcella sijringa is found at the same, even at greater 

 depths than Halecinm curvicdide, but the frequency shows that С 

 sijringa is essentially a shallow-water form, whereas H. cnruicaide 

 evidently prefers deeper water. On the other hand, there is no 

 doubt that Halecinm mnricatnm and H. lahrosnm belong to the same 

 depths, but both in table 3 and table 4 they stand far apart; in 

 table 5 we lind them together. In the arrangement of the table, 

 regard is taken not only of the depth at which the species has its 

 principal occurrence but also to the frequency with which it occurs 

 at the lesser and the greater depths. Cahjcella syringa as well as 

 Campanularia intégra have their principal occurrence in 20 — 40 m. ; 

 but С sgringa is very rare at greater depths, where Camp, intégra 

 is still common at 60 — 100 m.; in the table C. sgringa must there- 

 fore be placed before Camp, intégra. Grammaria abietina occurs in 



