ALCYON\i:l\ 13 



The tentacles of the autozooids have some twelve or thirteen pinna) on cueh Hide 



7 1 These pinna) are not always situated opposite to one another nor regularly 

 alternate. The pinna- <>f i>m- side seem to be develop! independently of those on the 

 oji|H,Mt. Ml.'. The M/- of i In- piiuuu varies in a manner that suggests that new pinnu- 

 ar<- mi, rjH.late.l L-tween the old ones ; but they rarely exceed a total length of 4 mm. 



There are numerous siphonozooids. The most conspicuous of these are arranged 

 in petaloid areas on the under, i.e., proximal side of the rosette (fig. 2). The apex of 

 seven of these petaloid area ends at the fork between two autozooids, but the apex of 

 , one area (fig. 2, V,) extends between the two autozooids to reach the distal side, where it 

 terminates at the base of the ninth autozooid. This area is, according to Dr. Juugcrsen 

 (p. 82), the ventral area. At the apex of the dorsal petaloid area, i.e., the one imme- 

 diately opposite to this, there is a single siphonozooid distinguished by its greater 

 site (fig. -J, !>.). 



The siphonozooids of these areas are about 0*3 mm. in diameter and project 

 slightly as small conical warts or papilla) above the ccenenchym. There can be no 

 doubt that they are to a certain extent contracted, as the mouth area is very con- 

 stricted. From the apex of the cone of many there projects a single long (O'G mm.) 

 simple digitiform tentacle (fig. 4). I have little doubt that each siphonozooid has such 

 a tentacle, but it is broken off or completely retracted in many. 



In addition to these, there are many other siphonozooids distributed on the stalk 

 and bulb. They are very inconspicuous when the surface of the spirit specimen is 

 examined, but they can be recognised as minute slit-like depressions, arranged in 

 longitudinal rows, when a simple magnifying glass is used. I cut tangential sections 

 through a small piece of the upper part of the bulb and found that these siphonozooids 

 have a diameter of about 0'14 mm. (fig. 6.) The stoinodaeum is long, penetrating 

 right through the thick cortex of the bulb, is oval in section, the longer diameter l>eing 

 about H- i mm., and it has a well marked siphonoglyph (-S/). The specimen is not 

 sufficiently well preserved to enable me to state definitely that the dorsal mesenteric 

 filaments are present, but certain groups of darkly stained cells situated below the 

 stomodaeum probably represent these structures. These siphonozooids do not possess 

 a tentacle. 



It was at this point in my investigation that a fire broke out in my lalx>ratory 

 and entirely destroyed the specimen. I am, therefore, unable to give any further 

 description of the distribution of these siphonozooids. There is no doubt that they 

 occur all along the thin part of the stalk and on the upper end of the bulb. I believe 

 they occur also on the lower part of the bulb, but I made no sections to confirm the 

 external features. It is not possible to make any definite statement concerning the 

 presence or absence of calcareous spicules in the bulb. There are no calcareous Ixxlies 

 in the upper part of the bulb, nor are there any in the autozooids or siphonozooids of 

 the rosette. In the one small piece of the dermis of the lower part of the bulb I could 

 find none, but it is just possible that a further search might have revealed them. 



