QUARTERLY CHRONICLE. 273 
cavity. In its integument, however, were situated numerous 
thread-capsules which, in form and size, as well as in the 
structure of the extruded urticating thread, corresponded 
with those of the above-described creature. 
The author is inclined to believe, though by no means 
regarding it proved, that the larva with the longitudinal 
band of cilia, may represent only a further stage of deve- 
lopment of that with the ciliated circlet, chiefly from the 
circumstance that the urticating capsules are alike, organs 
that have never yet been observed in any true Annelid 
larva. 
With respect to the presence of thread cells, he remarks 
that until within a brief period no one would for a moment 
have doubted that both these forms belonged to the Celente- 
rata, which alone were supposed to be furnished with those 
organs. There can, however, now be no doubt, from exten- 
sive observations both in terrestrial and aquatic forms, that 
in the Afolidina, Diphyllidia, certain Cephalopoda among 
the mollusca, in the Planaria among Annulosa, animals are 
found which also possess urticating capsules, sometimes in 
the integument, sometimes in special glandular sacculi. And 
more recently, Keferstein has even described a Sipunculidan 
furnished with them. 
The description of these larval forms is followed by a long 
and interesting disquisition as to the value of the various 
classifications of the lower animals, as regards more especially 
the Celenterata and the various forms assembled by Cuvier 
under the Radiata or Zoophyta, with which, as is well 
known, together with the distinct group of the Echinodermata, 
he included also the Sponges, Bryozoa, and the forms now 
placed in the Celenterata. 
4. “ On Solenogorgia tubulosa,” n. gen., by Carl Genth.— 
In the ‘ Annals and Magazine of Natural History,’ 3rd ser., 
vol. x, Dr. Gray notices two new species of Alcyonariz, to 
one of which that observer has given the name of Solenocaulon 
tortuosum. ‘The author is in some doubt whether the form 
he describes may not be identical with this species ; but since 
Dr. Gray does not enter into any particulars regarding its 
minute structure, by which alone the question could be fully 
determined, Herr Genth considers it better to regard his as 
a distinct genus, to which he has given the above name. His 
specimens were brought by Dr. Semper from the Philippine 
Islands. 
The growth consists of a main stem, which divides into 
irregular dichotomous branches. Both stem and branches 
are hollow, and at the points where the main branches spring 
