75 



are in the same stage of development. In 51 A. there is a young bract situated partly 

 over the primary siphon; it is still wanting in 71 B. This second siphon has not yet developed 

 its. tentilla. 



Cat. J I A. (see table) shows the same pneumatophore as 71 B., a primary siphon with 

 tentilla type I, a second siphon which now shows development of tentilla. These are the third 

 in size; they are called tentilla type III (PI. XIII, fig. 10 1). They are identical with those 

 which Dana 58 figures in his Crystalloinia polygonata and Gegenbaur 60 in fragments of 

 Agalma Okenii (Crystallomia polygonata). Their tentacle is sometimes quite extended and shows 

 the tentilla situated alternately on each side. The involucrum is quite closed and campanulate. 

 There are usually two rows of spindle-shaped nematocysts and three to five windings of the 

 cnidoband. Terminally there are the median lobe and lateral filaments; the latter are never 

 curled up. Already in this small specimen (71 A.) the tentilla of the second siphon are four 

 times as big as the tentilla of the primary one. Except a few buds of nectophores and some 

 palpons no other appendages are to be seen in Cat. 71 A. 



The following numbers Cat. i6j A. (PI. XII, fig. 95), 2j H., 2j E., 25 G. graduall)- 

 increase in size, although no new or other appendages are developed. They all show tentilla 

 type I at the base of the primary, tentilla type III at the base of the second siphon. We give 

 a sketch of Cat. 163 A. (PI. XII, fig. 95). 



In Cat. 151 H. a new type of tentilla is developed. It is called tentilla type IV\ a 

 tentillum (PI. XIII, fig. 102) consists first of all of a great many more turns of the cnidoband. In 

 young tentilla of type IV the involucrum closes entirely over the cnidoband, which shows then 

 6 — 7 turns; in older ones it seems the involucrum bursts and remains only partly covering 

 the first 3 or 4 turns, in general those turns which show the large ensiform cnidocysts. Entirely 

 developed, mature tentilla show from 7 — 13 turns of the cnidoband. For the rest they do not 

 differ in structure from type III. They are never so broad as type III as the size of all the 

 turns is more regular, and this is not the case in type III. 



Cat. 151 H., 151 F. (PI. XII, fig. 93), 75/ C, 21 sL., 163 B., SSL. all show the development 

 of the primary siphon with tentilla type I, the second siphon with tentilla III and IV. That two 

 types of tentilla occur at the base of one siphon means probably that they arise from the same 

 tentacle. This, however, we could not make out; the tentilla type III always have long pedicles, 

 and in many cases the tentacle was fully extended both projecting beyond the external line of 

 the other appendages. On the other hand we never saw a regular tentacle beset with tentilla 

 type IV; these are always situated at the base of the siphon. 



Tentilla type IV have never been described by any other authors. 



The pneumatophore of Cat. 151 F. is in relation to the other appendages very large 

 and strongly pigmented. One of the nectophores is more developed than the younger buds. The 

 stem is short, all the appendages are still grouped around a central more disc-like siphosome. 

 Besides 12 — 15 palpons with their palpacles there are the two siphons (the primary and the 

 second) the second siphon bearing tentilla type III with their tentacle and sessile tentilla type IV. 

 A young third siphon does not yet show any tentilla. 



The bract which is also shown in our sketch of Cat. 151 F. bears the shape of a 



