C. F. Liitken on Ophiurans. 55 
Art. VIL—Abstract of a paper on the Ophiurans, a tribe of Star- 
fishes ; by Dr. Cur. F. LUTKEN.* 
Terminology and Morphology. 
isc generally 
presents an unbroken edge, but below it is invaded by the arms, 
which pass along its under surface, quite to the mouth-slits, In 
_ describing Ophiure the mouth is placed downwards, the back of 
the disc is therefore the upper surface, towards the periphery is 
outward, towards the centre inward. The solid parts belong to 
_ corresponding part of the hinge, namely, two edges overging 
eis 
pointe mentioned by Gaudry in Asterophyton, deserve notice. 
e first is, that, when the arm divides in two equal branches, 
* Additamenta ad historiam Ophiudarum. Af det danske Videnskabernes 
Sels' Skrifter. 5te Pakke 6 bind. For this ta the Tousnsk is iidahaen 
to THEoporE Lyman of 
aa species of the genus Ophiactis (Litken) and in Ophiocoma pumella 
} Annales des Sciences Naturelles, 3m* Serie Zodl, xvi, 339. 
