103 
pidae und Cleistocarpidae hier zum ersten Male in unser 
Thiersystem eingeführt werden. Ueber die Entwickelung 
der Lucernarien hat Verf. leider Nichts in Erfahrung 
gebracht; er giebt jedoch an, Exemplare von kaum Yıg“ 
gesehen zu haben, die im Wesentlichen schon die Bil- 
dung ihrer Eltern gehabt hätten, obwohl die Zahl der 
Tentakel in den einzelnen Gruppen nur vier betrug. 
(Sollte nicht vielleicht Kalliphobe appendiculata von 
Busch, die Ref. auch in Helgoland beobachtete, den 
Schwärmling einer Lucernarie darstellen?) Die Vermeh- 
rung der Tentakel geht nach einem ganz bestimmten 
Schema vor sich, das sich eben sowohl durch eine Ver- 
mehrung in radialer, wie in transversaler Richtung cha- 
rakterisirt. ! 
- Das Clark’sche System der Lucernarien ergiebt sich 
‚aus nachfolgender Uebersicht: 
Fam. Cleistocarpidae. The neighbouring halves of ad- 
joining genitals approximate each other and unite at their distal 
 ends opposite the corners of the quadrate mouth and extend to or 
toward the four intertentacular margins which alternate with the 
partitions; the approximate genital halves, from their axial to the 
distal end, united by a transverse horizontal membrane, which di- 
vides each of the four quadrant camerae of the dise into two su- 
perposed spaces, the oral one of which forms a cul de sac, or clau- 
strum, opening at the axial end, and includes the genitalia. 
Gen. n. Halimocyathus Cl. Disk infundibuliform,  octohe- 
dral; arms produced; pedicel tetracamerous; tentacles in groups at 
the end of the arms, outer row pistilliform like the marginal an- 
chors, radial development of the group greater than the transverse; 
marginal anchors pistilliform; genital halves transversely folded 
bands, united at their proximal ends across the end of the inter- 
vening partition, their distal end reach nearly to the marginal an- 
chors; the digitate bodies do not extend across the proximal end 
of the partitions; muscles of the pedicel four filaments alternate 
with the four camerae; principal muscles ofthe disk eight lingulate 
bands, arising from the proximal ends of the partitions, extend to 
the end of each arm; marginal muscle broad and thin, forming a 
sort of velum which projects beyond the margin of the aboral side; 
at the end of the arms it merges into the lingulate museles of the 
oral side of the disk; gelatiniform layer of the aboral side and the 
pedicel conspicuous. H. platypus n. sp. Chelsea Beach. 
