88 
Proceedings of the Royal Society 
Olfactory tubercle with the opening turned towards the right 
side ; anterior horn turned outwards, posterior coiled outwards. 
One specimen from Station 271 (in the centre of the Pacific 
Ocean), 2425 fathoms. 
These six species of Culeolus are all from upwards of 500 fathoms; 
five of them are from over 1000 fathoms, four from over 1500, 
and two from upwards of 2000 fathoms. They all belong to the 
abyssal zone. 
In connection with the uniformity of the abyssal fauna, it is 
interesting to note that these six species, the only deep-water 
Bolteninse, all belong to one genus, notwithstanding their wide 
distribution in space ; — one species being from the North 
Atlantic, two from the Southern Ocean, one from the South 
Pacific, one from the North Pacific, and one from the centre of 
the Pacific Ocean on the equator. 
Besides Ouleolus, the only genus in the Cynthiadse represented 
at depths of over 500 fathoms is Styela. Three species, S. flava, 
S. oblonga, and S. glans , were obtained from 600 fathoms, and two, 
S. bythia f and S. squamosa , from 2600 fathoms ; these are perfectly 
normal members of the large and widely distributed shallow-water 
genus Styela. The great majority of the remaining species described 
in the present part are from depths of less than 50 fathoms. 
2. On the Histology of the Pedicellarise and the Muscles in 
Echinus splicer a, Forbes. By Patrick Gecldes, F.B.S.E., 
Lecturer on Zoology in the School of Medicine, Edin- 
burgh, and Frank E. Beddard, B.A., Assistant-Demon- 
strator of Zoology, Oxford. 
(Abstract.) 
This paper contains a detailed account of the structure of the 
soft parts of the four varieties of Pedicellarise in this species 
describes particularly certain new pseudo-skeletal structures, and 
concludes with a reconciliation of the hitherto contradictory views 
as to the structure of Echinoderm muscles. 
