POLYZOA, 
Moll. G7 
Ctenostomata. 
Larjuncula repens (Farre) and Dowerhankia dcnsa (Farre) from the 
Caspian Sea, Grimm, 1. c. pp. 117-120, pis. iv. figs. 4 & 5, vi. fig. 17. 
Uypopliorella, g. u. {Vesicular iido}). “Bryozoarium stolonibus rect- 
angularibus conjunctis repens, in extremitate articulorum antica dilatata, 
praeter articulum lateralem terminalemque, singula animalia alternatim 
in stolonibus collocata, urceolata, juxta aperturam transversam ventralem 
utroque corniculo arinata gignens.” H. expansa, sp. n., ramified threads 
of elongated cells without intestines and without genital organs, which 
bear laterally other animal cells provided with intestine, feelers, and 
genitals ; the animal cells and the secondary branches are placed alter- 
nately on the same stem. It lives within the tube of Terelella conchi- 
lega (L.), in the North Sea, the threads undermining its walls, and the 
animal cells opening on the inside of the tube. The anatomy, the 
development, and the “ histolysis,” i e., transformation of the intestine 
(polypid) to brown bodies and regeneration of it, are fully described. 
The larva produced by the animal cells and contained within them 
has first a biconical and then a conoid shape, and is encircled with a 
simple row of cilia, having an oral opening near this ring ; the youngest 
stage observed in the free state at the inside of the tube has nearly the 
shape of a peach, and is clothed with fragments of sand or foreign shells ; 
it produces by budding first the stalk cells and afterwards the nutri- 
tive cells. Eulers, Abh. Ges. Getting, xxi. pp. 1-132, pis. i.-v. 
Alcyonidium. gelatinosum^ Pall.; some figures of it, from specimens 
observed at Zandvoorl, Holland, by M. II. Weyenburgh, Period. Zool. 
Argent, i. 1874, p. 80, pl.ii. figs. 19-25. In Zool. Rec. xii. p. 212, Buenos 
Ayres is by mistake named as the locality of these specimens. 
