85 



tentilla which have the characteristic shape described by Huxley 59. They possess no involucrum, 

 six to eight turns of the cnidoband and these end in a simple terminal filament. There are 

 no palpons in this cormidium. These appear near the second siphon, they are not sessile but 

 bear long stalks. This second siphon also bears numerous tentilla. More proximally still, we find 

 a third and fourth siphon, both young and with undeveloped tentilla. 



Finally there is yet one bract which is cartilaginous and has a foliate shape. 



Gonophores were not found in this specimen. 



51. Halistemma czipulifera nov. spec. PI. X\T, figg. 116 — 119. 



Stat. 244. Lat. 4°25.7S., Long. 130° 3.7 E. Depth 2991 M. Crt/. 60. formald. 4%. One specimen. 



W'e describe under the name of Halistemma cupulifera a specimen, which owing to the 

 structure of its tentilla we consider new to science. 



It has probably undergone much alteration through the preservation, as many of its 

 appendages are lost and its stem is contracted. Its general aspect as shown on PI. XVI fio-. 116 

 will therefore hardly correspond to reality when some day it will be examined alive. 



The pneumatophore is elongated, pointed towards its apex, and bears an annular con- 

 striction near the middle of the air-sac. 



The nectosome consists of a short, strongly muscular nectostem of 4 mm. length and 

 1,5 mm. breadth. There are only three buds of young nectophores left situated nearer to the 

 top of the nectostem. They show paired lateral bunches of cnidocysts; the shape could not be 

 more closely determined as they are not yet enough developed. There are further more indications 

 of detached nectophores on the nectostem. 



The siphosome is only very short; its actual length cannot be given, as it is partlv 

 covered over by its appendages. There are four siphons, of which the oldest, the first developed 

 one, is situated terminally. The second and the third are also mature (length of the third siphon 

 5 mm.). These three all bear numerous tentilla some of which are entirely developed and mature. 

 They consist (PI. X\T, figg. 117, 118) of a cnidoband (no involucrum) which shows four to five 

 spiral turns. The first two turns show moreover ensiform cnidocysts on both sides. In the 

 tentillum which we have sketched the spiral turn is loose, which enables one to distino-uish 

 well the elastic band. The cnidoband ends in a terminal filament which shows cnidocysts entirelv 

 different from those of the cnidoband. It is in all cases contracted and bears at its terminal end 

 a small acorn-cup-shaped appendage {cupulifera) the basal part consisting of (PI. X\'I, fio-. 118) 

 an agglomeration of the small circular cnidocysts of the terminal filament and proximally of 

 many delicate ectoderm-cells. This latter part is often absent and in the specimen manv tentilla 

 are found which consist only of the fine small cup-shaped, concave appendao-e. As far as we 

 know, a tentillum such as this one has not yet been found. These tentilla and many stao-es 

 of development are found near the base of the first, second and third siphon. A tentacle was 

 probably contracted. 



Between the third and the fourth siphon a space is left open which in life was probably 

 filled by another siphon. We suppose this to be the case, as the following siphon is young and 



