iS 



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 Moseley's in two particulars. It has been found that the 

 o-astropores or dactylopores are in many species regularly arranged. For example the dactylo- 

 pores in E. glabra (Pourtales) are placed in a row upon both of the lateral sides of the branches, 

 and in E. ramosa the gastropores always occur singly, at the angles of the branches and chiefly 

 on the anterior surface. Moseley gives four as the number of the tentacles of the gastrozooid. 

 This is not quite a constant number, as in one branch of E. 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 cleep sea genus of wide distribution. The following are the depths at which 



the various species have been found : 



E. pourtalesii Dall. 50 — 100 fms. E. carinata Pourtales. 270 — 292 fms. 



E. labiata Moseley. 90 — 600 fms. E. aspera Gray. j 



' > depths not recorded. 



E. glabra Pourtales. 100 — 558 fms. E. Jissurata Gray. ) 



E. cochleata Pourtales. 154 — 292 fms. 



The two new Siboga species occurred at : 

 E. ramosa 283 fms. (520 M.) E. horrida 605 fms. (1089 M.) 



Geographically the species have been found as follows : 



Pacific Ocean. Atlantic Ocean. 



E. pourtalesii. E. carinata. E. dabneyi. 



E. ramosa. E. cochleata. E. labiata. 



E. horrida. E. glabra. E. regularis. 



E. fissurata is recorded from the Antarctic Ocean. 



1. Errina ramosa sp. n. Plate II, figs. 18 and 19. 



Stat. 297. io°39'S., i23°4o'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 



