CTENOPHORA. Cosh 20 
vessels with blind terminations. Cydijppidce (^PleurohracJiiidm^ 
MertensiidcB). 
2. Clusters of numerous filaments, placed on each side in a furrow 
running alongside the oral orifice and provided with a suspen- 
sion apparatus, consisting of cilia ; primary tentaoula present 
or wanting; vessels communicating with each other. The 
juvenile stages are Cydippm. 
A. Two oral lobes. Lohatce {Lesueria^ EurrhamphcBa^ BoUna, 
Eucharis, &c.). 
B. Body band-shaped. Gestidce. 
(B.) Nuda. 
Without tentacles j vessels ramified in all directions. Beroidm. 
Seventeen species were observed in the Bay of Naples ; six are 
new, viz., Pleurohrachia rhodopiSy Euplocarnis (g. .n.) stationis^ Lam- 
petia (g. n.) pancerina {Pancerina singularisy id. [3]) (pi. vi. fig. 4), 
Charistephane (g. n.) fugiens^ Bolina hydatina, Thoe (g. n.) paradoxa, 
Deiopea (g. n.) kalohtenota (pi. vi. figs. 1-3). Of these, however, Thoe 
is probably a larval form of Lampetia or Pleurohrachia. Short notes on 
synonymy, evolution, &c., are added under the heads of the different 
species. The observation is recorded that Ctenophora (and Medusce) during 
the warmest season sink to the bottom and do not appear on the surface, 
either by day or night. In the young Cyc^^ppe-shaped Cesium, the 
short axis of the body is that which afterwards is extraordinarily pro- 
longed. Many species and genera of Ctenophora are only based upon slight 
variations or upon juvenile or mutilated specimens. Probably almost 
all the described species of Beroe (^Idyd) ought to be reduced to the two 
cosmopolitan species, also existing in the Mediterranean, viz., B. ovata and 
forskali. In this ^enus the tentacula, which in others act as prehensile 
organs, as means of catching the prey, are wanting, but the animal darts 
rapidly through the water and swallows a prey, for instance a Eucharis, of 
superior size [3]. Lampetia is capable of creeping, by the aid of its dilated 
mouth, along the surface of the water or the walls of the aquarium. The 
juvenile Cyc?^ppe-shaped stage of Eucharis multicornis may be found 
sexually mature, though that is not the case with any of the intermediate 
stages leading to the adult sexually-mature Eucharis. [The suggestion 
that two similar forms, a true Cydippe and the larval Eucharis, might 
here have been confounded, is not supported by the details adduced.] 
In Eucharis, the tentacles of the Cydippoid larval form are entirely 
reabsorbed to give place for a totally new formation of the tentacular 
apparatus characteristic of the adult form. Certain Ctenophora {Eucharis, 
for instance) attain a considerable size, such as the height of a metre. 
Just as Chun’s shorter paper (4) may be regarded as a prodromus for a 
Ctenophorian fauna of the Mediterranean, his larger one (3) is the ana. 
tomico-physiological forerunner of an elaborate monograph, of which certain 
chapters are here published in anticipation. The results of his researches 
are much at variance with those of others, especially of Eimer. In Beroe ^ 
Cydippe, and the Cydippoid larvae of Eucharis and Cesium, locomotion 
is exclusively performed by the combs of the ribs ; in the “ lohatce ” it is 
