2:3 
of the cyclosystems, finer terminal branches, cyclosystems more crowded and the presence of 
perforated tubercles on the surface and in the different method of distributing the spermatozoa. 
The species may be defined ; 
Hydrophytum irregularly flabellate; with scattered perforated tubercles on the surface ; 
cyclosystems round with a large lid bearing perforated tubercles; lids closely crowded; ampullae 
upon the lid. 
4. C. platypoma sp. n. Plate III, figs. 26 and 27. 
Stat. 156. 0°29'.2S., 130°5'.3 E. N.W. of New Guinea. 469 M. 1 Ex. 
This is a small, irregularly flabellate species, with non-anastomosing branches. The colony 
was probably about 20—25 mm. in height, the base of the main stem is 2 mm. in diameter. 
The longitudinal striations are even less marked than in the preceding species: fine transverse 
striations are also present. The colour is yellowish white. The cyclosystems are oval and are 
on an average 0,88 mm. by 0,66 mm. There are usually only 7 or 8 septa. This small number 
is partly due to the presence of a very broad lid. This lid is however not long and does not 
usually completely cover the calicle. There is no external evidence of ampullae, although it 
cannot be a very young colony as several old cyclosystems have been covered up by coenenchym. 
This species approaches nearest to C. pzercez (Pourtales) which occurred off Havanna, Sombrero 
Lighthouse and Bahia Honda. But although, C. pzercez is of about the same height, the cyclosystems 
are more than twice as large, being 2 mm. in diameter: the lid also is not so extensive. 
C. platypoma comes from a depth of 469 M., which is shallow water for a Cryftohelia, 
the only other species of this genus recorded from a similar depth is C. pzercez. 
The species may be defined; 
Hydrophytum irregularly flabellate, cyeclosystems small, oval, with 8 septa and a short 
broad lid. 
5. Cryptohelia bala sp. n. Plate III, figs. 28 and 29. 
? syn. Endohelia japonica Milne Edwards and Haime. Hist. Nat. d. Cor. t. II, p. 128. 
Stat. 177. 2°24'.5 S., 129°38.8 E. N. of Ceram. 1633 to 1300 M. One young colony and 4 
fragments of older ones. 
This is a subflabellate, more or less encrusting species, the branches sometimes adhering 
to the objects it grows upon by a thin lamina produced from the under surface. The branches 
may anastomose. It is curiously irregular in growth, cyclosystems sometimes appearing on the 
posterior, instead of the anterior surface of the corallum. The colour is white. The surface is 
longitudinally striated and granulated, the granules sometimes being arranged irregularly or 
disposed in rows so as to give the usual appearance of transverse striations. Large nematophores 
are scattered over the surface (Fig. 29 nem.). They appear in dried or calcined specimens as 
pits with slightly raised edges; they may be as much as 0,1 mm. in diameter. The cyclosystems 
are round and about 1,6 mm. in diameter. The edge of each cyclosystem is slightly crenate 
