144. WILLIAM BLAXLAND BENHAM. 
This species was dredged off the Philippines, at ten to 
twenty fathoms, sandy bottom. 
[The anatomy of this species, as well as the colour of spirit 
specimens, so closely agree with those of Ph. australis, that 
it may possibly turn out that they are one and the same 
species, which may have taken on different habits, one variety 
selecting a ready-made sac to. inhabit, the other secreting a 
tube for itself. ] 
5. Ph. ovalis. 
The second species described by Strethill Wright (25) as 
Ph. ovalis, was a much smaller form, in which the eighteen 
tentacles were arranged in a simple oval fashion without being 
bent in dorsally. This is probably a young form. Tube em- 
bedded in oyster shells. 
Probably Crepina gracilis, described by van Beneden 
(3) as possessed of thirty tentacles, and forming a membranous 
tube, is merely a young form of some species of Phorounis. 
This is also found embedded in oyster shells. 
Besides these described forms, it is known that there is more 
than one form of Actinotrocha, viz. Act. branchiata and 
Act. ornata, and probably others, which have not been traced 
to the adult animal. 
III. RELATION oF PHORONIS TO OTHER ANIMALS. 
The opinions of some of the earlier authors may be passed over 
in a few words, inasmuch as they were founded on an incomplete 
acquaintance with the anatomy and development of Phoronis. 
Thus Miller (21) (1854) regarded Actinotrocha as a Sipun- 
culid. . 
Krohn (16) thought it might be a larva of a form like 
Thalassema or Echiurus, and Schneider, (22) (1862), with 
more grounds for his opinion, looked on Phoronis, or rather, 
3 “Notice sur un annelid ceph. sans soies,’ ‘Ann. d. Se. Nat.,’ 1858, 
vol. x. 
1 *Miiller’s Arch.,’? 1854. 
16 * Miiller’s Arch.,’ 1858. 
22 <«Miiller’s Arch.,’ 1862. 
