352 PERCY SLADEN TRUST EXPEDITION. 
circular aperture. There are no styles either in the gastropores or dactylopores. The 
dactylozooids are of considerable length and when at rest hang down in the grooves 
between the septa. 
The genus Conopora is undoubtedly closely related to Astylus, from which it differs in 
having a circular instead of a horseshoe-shaped perforation of the horizontal septum. 
In this respect it resembles Cryptohelia, from which it differs in the absence of a lid 
covering the cyclosystem *. 
Conopora dura differs from C. tenuis in having a solid axis. In C. tenwis the axis is 
usually fistulose, this condition being brought about by its association with a polycheet 
worm. It also differs from C. tenuis in the smaller size of the aperture in the horizontal 
septum and alse apparently in the absence of a definite canal between the dactylopore 
and gastropore (¢f. Moseley, ¢. c. pl. ii. fig. 8, c.c., and Hickson and England, pl. iii. fig. 35). 
The species may be defined :— 
Hydrophytum flabellate (? or subflabellate), axis solid, branches stout, small nemato- 
pores on the surface. Cyclosystems irregularly scattered, with only slightly raised edges. 
Aperture between the upper and lower chamber of the gastropore small; no distinct 
canal between dactylopore and gastropore. Septa deep, variable in thickness. 
Genus SPINIPORA. 
ll. Spinipora echinata, Moseley. (Plate 44. fig. 8.) 
Spinipora echinata, Moseley, ‘ Challenger’ Zoology, vol. ii. p. 55. 
Providence, D 4, 75 fms. Several fragments. 
The genus was described by Moseley (5. p. 55) from a small piece of coral obtained off 
La Plata in 600 fms. 
No other species has been described since, and we have not been able to find any 
reference in literature that enables us to say that any other specimens of the type species 
have been found. The rediscovery of the species after a lapse of thirty years is in itself 
a feature of considerable interest. 
The material sent to us consists of six fragments, some of which may have belonged to 
the same colony, of which the largest is 25 mm. in length and the thickest branches not 
more than 5 mm. in diameter. 
The hydrophytum appears from the evidence of these fragments to be irregularly 
flabellate in growth, the branches attenuating rapidly towards the moderately sharp 
terminal points. 
The larger kind of dactylopores are protected by grooved half-tubes of ccenosteum 
(Moseley’s nariform processes), which are arranged roughly in longitudinal rows near the 
ends of the branches, but seem to be more irregularly scattered on the thicker parts of the 
colony. They vary a good deal in length, but the most perfect are about 0°2—-0°3 mm. in 
length. In the dead parts of the ccenosteum these processes are worn down almost to the 
general surface of the branch. 
* In two of the cyclosystems one of the larger septa projects from the surface above the level of the adjacent ones, 
ying an appearance of an incipient lid such as we find in Cryptohelia stenopoma. 
