370 
Proceedings of the Royal Society 
Caribbean Sea. It was dredged by tbe “ Blake ” at a very large 
number of stations ; but tbe depth was nowhere over 300 fathoms, 
and rarely exceeded 200 fathoms; so that its discovery in the 
“ Porcupine ” collection increases both its bathymetrical and its geo- 
graphical range. Excej^t the two species of Rhizocrinus, it is the 
only Crinoid common to the European and Caribbean seas ; while 
it is the only European species of Actinornetra. This is an essen- 
tially tropical genus, a few species only ranging to the parallels of 
35°, such as those at the Cape of Good Hope, Yeddo, and this 
Gibraltar specimen. The depth too, 477 fathoms, is much greater 
than that at which the genus usually occurs ; so that this “ Porcu- 
pine ” specimen which, like Rliizocrinus rawsoni, was obtained in 
European seas long before its discovery on the other side of the 
Atlantic, is of interest in every way. 
The “Porcupine’s” discovery of Actinornetra 'pidcliella in the East 
Atlantic has been recently confirmed and extended by the dredgings 
of the telegraph-ship “ Dacia,” a few dismembered individuals having 
been obtained in lat. 34° 57' H., long. 11° 57' W., at a depth of 533 
fathoms. 
All the primary arms divide except one ; but the number 20 is 
kept up by the fact that a palmar axillary is present on one of the 
secondary arms, a point which I do not remember to have met with 
in any of the “Blake” speciuiens. This involves a slight addition 
to the second of the two formulae which I have given for this 
dimorphic type,"^ so that they become 
a.lO.X; anda.2.(2).^ , . 
In the following list of stations at which Crinoids were dredged 
by the “Lightning” and “ Porcupine,” the forms which are now 
noticed for the first time are distinguished by an 
Station List of Crinoids and Myzostomida, 1868-70. 
H.M.S. “ Lightning.” 1868. 
Station 12. Lat. 59° 36' K, long. 7° 20' W. 530 fathoms. 
Temp. 47° "3 E. Globigerina ooze. 
Rliizocrinus lofotensis. 
* Proc. Zool. Soc., 1882, p. 745. 
