694 
Proceedings of the Royal Society 
Sabella , fragt. 
Nemertes, n. sp. 
Phascolosoma. 
Station 10. 1 
Tomopteris onisciformis. 
Report on tlie Holothurioidea. By Dr. Hjalmar Theel. 
This Report was received by the late Sir C. Wyville Thomson in 
November 1880. 
Lxtmogone violacea , Theel ( Preliminary Report on the Holothuridx 
of H.M.S. “ Challenger vol. i. ; Bihang Till K. Sv. Vet. Alcad. 
Handl , Bd. 5, No. 19, Stockholm, 1879, p. 11). 
Station 4, 555 fathoms. Several hundred specimens. 
Station 5, 515 fathoms. One specimen. 
Station 6, 630 fathoms. One specimen. 
It is a somewhat surprising and highly interesting fact that this 
beautiful animal should be found in abundance in a locality so far 
from Australia (Station 164, lat, 34° 8' S., long. 152° 0' E.) where 
the two specimens hitherto known were dredged up during the 
“Challenger” expedition, at a depth of 950 fathoms. Moreover, it 
is impossible to discover any characteristic by which these almost 
antipodal specimens may be distinguished one from the other. 
Some species of Elasipoda vary a good deal in the number and size 
of the processes and pedicels; in Lxtmogone violacea as well as in 
Oneirophanta mutabilis, Theel, and Lxtmogone wyville thomsoni, 
Th6el, this variation is so great that scarcely any one individual 
resembles another completely. Many forms of Elasipoda appear 
to congregate in very great numbers on the deep-sea bottoms, walking 
together in large flocks. During the “ Challenger ” expedition it was 
not uncommon to procure at the same time and in the same locality 
a great many individuals of the same species, sometimes a hundred 
or more ; and this very summer Mr. Murray has found several 
hundred individuals of Lxtmogone violacea living together in the 
same place. 
The Elasipoda are essentially deep-sea forms. With few excep- 
tions all hitherto discovered genera and species of this order belong to 
