18 
can be entirely retracted. Ampullae prominent, scattered, in male and female; male gonophore 
with branching spadix, several in each ampulla; female gonophore solitary in each ampulla. 
This description differs from Mosetey’s in two particulars. It has been found that the 
gastropores or dactylopores are in many species regularly arranged. For example the dactylo- 
pores in £. glaéra (Pourtales) are placed in a row upon both of the lateral sides of the branches, 
and in £. ramosa the gastropores always occur singly, at the angles of the branches and chiefly 
on the anterior surface. MoseLry gives four as the number of the tentacles of the gastrozooid. 
This is not quite a constant number, as in one branch of &. ramosa that was examined the 
gastrozooids had either four or five tentacles. 
We have also added a note on the contents of the male ampullae. 
This is a deep sea genus of wide distribution. The following are the depths at which 
the various species have been found: 
£.. pourtalesiz Dall. 50—1co fms. £. carinata Pourtales. 270—292 fms. 
£.. labiata Moseley. o—6oo fms. E.. aspera Gray. 
7 a depths not recorded. 
£. glabra Pourtales. 100—558 fms. E. fissurata Gray. 
£.. cochleata Pourtales. 154—292 fms. 
The two new Siboga species occurred at: 
E. ramosa 283 fms. (520 M.) £. horrida 605 fms. (1089 M.) 
Geographically the species have been found as follows: 
Pacific Ocean. Atlantic Ocean. 
£. pourtalesiz. E£. carinata. £. dabneyt. 
E. ramosa. E.. cochleata. E.. labiata. 
E.. horrida. £. glabra. £. regularis. 
£. fissurata is recorded from the Antarctic Ocean. 
1. Errina ramosa sp. n. Plate Il, figs. 18 and 19. 
Stat. 297. 10°39'S., 123°40 E. Between Timor and Rotti. 520 M. Several pieces, not all of 
one colony. 
This species forms a delicate, subflabellate coenosteum the branches of which have a 
tendency to be dichotomous, as is the case in other species of the genus. The branches do 
not anastomose. The height of the largest colony is about 60 mm., the spread 80 mm. The 
colour is white. The surface is very irregular on the younger branches, owing to the projecting 
dactylopores, between which are longitudinal grooves. At the bottom of these grooves are the 
pores of the coenenchym, which in the older branches are more or less slit-shaped. When 
calcined it can be observed that the whole surface is also covered with granulations, or very 
minute closely-placed spines. The gastropores occur singly at the angles of the branches, chiefly 
on the anterior surface. They appear first as a shallow circular pit, (Fig. 19 y. gast.) with the style 
in the centre (at right angles to the axis of the branch); then the pit deepens and the edges 
