ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
353 
largement of the tentacular nerve, which is distinguished by the presence 
of a large group of transparent sensory cells, surrounded by pigment ; 
the whole group is invested by a pigmented layer. In S. orsinii each 
tentacular nerve gives off a short nerve-branch, the end of which enlarges 
into a spherical ganglionic structure. It may be supposed that the 
paired pigment-spots known to exist in S. lappa and S. vivipara are 
sensory organs. The fibrous bundles which are inserted into the inner 
side of the wheels of species of Chiridota arise from a mass of connec- 
tive tissue common to the whole wheel-papilla, and consist of six fibres 
of equal thickness. 
Fission of Cucumaria planci.* — Mr. H. C. Chadwick observed an 
adult Cucumaria planci become motionless and so remain for two days ; it 
then became much attenuated in its middle, and the rupture which 
ensued and slowly elongated brought the intestine into view. The two 
ends snapped asunder, and the anterior slowly crawled onwards. The 
projecting intestine eventually decomposed. A fortnight afterwards the 
posterior half had a new mouth and a circlet of minute tentacles. In 
six weeks the author’s three specimens were increased to seven, and a 
large number of ova had also been deposited. 
Ccelenterata. 
Organization and Development of Anthozoa.f — M. P. Cerfontaine 
has a preliminary notice of the results of his studies on various Anthozoa. 
He has studied the development of the twelve first septa in Cereactis 
aurantiaca ; he finds that the laws of their appearance are identical with 
those recently formulated for Manicina areolata by Wilson. In young 
larvae there is only one pair of septa, which divide the cavity into two 
unequal chambers ; the second pair soon appears in the larger chamber, 
and the third in the smaller. The fourth, contrary to the statement of 
Lacaze-Duthiers, appear in the space bounded by the septa of the second 
formation, and not between the first and second septa. 
The development of the sarcosepta of Asteroides calycularis has been 
investigated. After the first twelve sarcosepts have become united by 
their inner edge to the oesophagus, four new pairs, and then two others 
appear ; they become of the same size as the first six pairs, and also become 
united with the oesophagus. Finally, twelve new pairs are developed 
between the first twelve, and bring the number of sarcosepts up to forty- 
eight ; these last attain a full development, but do not unite with the 
oesophagus. The author was enabled to completely follow the course of 
development of the tentacles in A. calycularis , and he finds the order of 
the appearance as described by Lacaze-Duthiers for Actinia mesembry- 
anthemum. 
Cerianthus oligopodus is a new species from the Mediterranean, dis- 
tinguished by the smaller number (19) of marginal tentacles from any 
one of the three species already recorded from that sea. 
Alcyonacea of Bay of Naples. J — Dr. G. v. Koch gives an account of 
the Alcyonacea of the Bay of Naples. He arranges them in three 
* Trans. Liverpool Biol. Soc., v. (1891) pp. 81-2 (l pi.), 
f Bull. Acad. Roy. de Belgique, lxi. (1891) pp. 25-39 (2 pis.). 
t Mittheil. Zool. Stat. Neapel, ix. (1891) pp. 652-76 (1 pi. and 28 figs.). 
