CCELENTERATA, 
669 
gument contains two kinds of nematocysts, and is also furnished 
with a ciliated hand of closely set cirrhi, which can bend to 
either side. Dr. Semper concludes this to he the larva of a 
(free-swimming ?) Actmia. Another smaller form met with, in- 
stead of a longitudinal band of cilia, was furnished with a circle of 
cilia, as in many Annelid larva : the body-cavity was not noted; 
but the integument contained thread-capsules, and the author 
considers it was probably the younger stage of the first-described 
form. Now that thread-capsules are met with among the highel* 
mollusca, among the Planaria, and among the Gephyreans (Si- 
punculus), their presence cannot be considered characteristic 
of the Coelenterata ; this leads Dr. Semper to a disquisition as 
to the value of the various classifications now adopted for, the 
old group Radiata of Cuvier. 
Wright, T. Strethill. Observations on British Zoophytes. 
Journ. of Anat. & Physiol. May 1867, pp. 332-335, 
plate 14. 
HYDROZOA. 
Tubulariidce. 
Cordylophora lacustris, Allman. Van Beneden mentions the occurrence of 
this species at Ostend adhering to the shells of Drcissena polym(yi'pha. Bull, 
Acad. Roy. Belgique, 2nd ser. vol. xxiii. 1867, pp. 708-709. 
Corym ferox^s^. n., Strethill Wright, 1. c. p. 335 (not figured), resembling 
C. dccipiam (Dujardin). 
Atractylis hitcntacidata, sp. n., Strethill Wright, 1. c. p. 334, fig. 6, in a 
Pecten-shell dredged from the Frith of Forth, near Inchkeith; A. quadri-r 
tentamdata, sp. n., Strethill Wright, 1. c. p. 334, fig. 6, from Frith of Forth. 
Stomohrachium octocostatunij Forbes. Dr. Strethill Wright (1. c. p. 332) 
calls attention to a retiform system of fine canals permeating the muscular 
weh of the subumhrella of this species, which system was altogether distinct 
from the eight large lateral canals which carry the ovarian hands. This new 
canal-system consisted of from three to five fine tubes, which sprung from 
the upper margin of the peduncle, between each of the lateral canals, and 
passed outwards and downwards as a rarely anastomosing network to join 
the circular canal bordering the mouth of the umbrella. The presence of 
ciliary action throughout this, system was indicated by the vibratory and 
onward movement of the milky fluid contained therein. The function of the 
system is evidently to supply nutrient material to the powerful muscular 
tissue of this rapidly swimming medusa. The hydroid phase of Stomobra'- 
chium has not been as yet observed, but will doubtless be a tubularian polyp 
allied to Atractylis or Clavida, 
Campanulariidoi, 
Acanthohrachia^ g. n., Strethill Wright, I, c. p. 833, pi. 14. fig. 2. Um- 
brella hemispherical, laterally compressed. Peduncle four-lipped, short. 
Lateral canals four. Tentacles eight; six long, springing from the sides of 
margin of the compressed umbrella; two abortive, placed at each end of the 
umbrella. Otolithic sacs eight ; two accompanying each of the tentacular 
