79 



Cat. NO I I St siphon 



2d siphon I i-i siphon 4>h siphon | 5>l' siphon '< 6'h siphon j 7th siphon 8* siphon 



IV9 



IV 

 IV 



IV III 

 IV III? 

 IV III? 

 IV? 

 IV? 

 IV 

 IV III 



IV 1119 

 IV 1119 



IV 



IV 



IV 



IV 



IV 



IV 



IV III 



IV 



IV? 



IV III? 

 IV III? 



IV III 



IV9 



IV III? 



IV III? 

 IV? 



IV? 

 IV? 



IV 

 IV 



IV III 

 6? 



IV III? 



IV III 



beginning with the youngest larval stage to 

 the most developed one. We found how the primary siphon with its tentilla I drops off and is 

 replaced by younger definite siphons with different tentilla of which we described the two types 

 In the second group of Crystallomia spec, of which 25 out of 35 belong to one station 

 this primary siphon with tentilla I always fails, but we found groups with tentilla absolutely 

 differing from the other three types of tentilla. These are tentilla type II. They are second in 

 size (PI. XIII, figg. 99, 100); the involucrum is entirely closed over the cnidoband in fig. 99. 

 In our sketch of fig. 100 the last half spiral has somewhat loosened itself and has pierced the 

 involucrum. Other tentilla, however, showed us clearly how the involucrum is normally closed 

 The cnidoband consists of \^l„ — 2 turns, the first turn showing one or two rows of ensiform 



