ON PHORONIS OVALIS, STRETHILL WRIGHT. 
145 
EXPLANATION OF PLATES 1, S, and 9, 
Illustrating Mr. Sidney F. Harmer’s paper “ On Phoronis 
ovalis, Strethill Wright.” 
Reference Letters. 
ad. Adipose tissue, or vaso-peritoneal tissue, amp. Ampulla, an . 
Anus. a. v. Afferent blood-vessel, ep. Epistome. e. v. Efferent blood- 
vessel. /. Fission-zone. int. Intestine, or ascending limb of the 
alimentary canal, inv. Invagination of the proximal end of the 
muscular part of the body-wall. Z. Lophophore. l.m. Longitudinal 
muscles, m. Mouth, mes. Median mesentery, muse. Muscular part 
of the body-wall. neph. Nephridium. n.r. Nerve-ring. ces. (Esophagus. 
or. Orifice of invaginated body-wall. ov. Ovary, pr. Pro ventri cuius, 
constituting the greater part of the descending limb of the alimentary 
canal, s.s 1 ., Septum of tube. st. Stomach, t. Tube. tent. Tentacles. 
[All the figures refer to Phoronis ovalis. The sections, PI. 8,. 
figs. 14 and 16-26, were drawn with a Zeiss C Obj.; the remaining 
figures with a Zeiss A Obj. All the figures have been reduced two- 
thirds.] 
PLATE 7. 
Fig. 1. — The expanded lophophore of an adult specimen. Eighteen 
tentacles can be counted. Slide L. 
Fig. 2. — A fully adult specimen with expanded tentacles. The ovary 
(ov.) is developed. The lobed character of the proximal end of the body 
probably indicates, as in other similar cases, that the ampulla (amp.) 
has not been completely reconstituted after transverse fission. Slide O. 
Fig. 3. — A. smaller specimen with retracted tentacles. Slide M. 
Fig. 4. — A small regenerating fragment. The marked angle between 
the axes of the proximal and distal parts of the body probably 
indicates, as in fig. 3 and other specimens drawn, the lateral outgrowth 
of the new distal part of the tube necessitated by the closure of 
the original tube by the septum formed during the process of transverse 
fission. Slide O. 
Fig. 5. — A smaller regenerating fragment. Slide N. 
Fig. 6. — A small regenerating fragment in which the lophophore 
is not yet developed. The muscular part of the body-wall (muse.) is 
already indicated. The adipose tissue (ad.) fills most of the body- 
cavity. Slide M. 
Fig. 7. — An extremely small fragment in about the same stage of 
regeneration as the preceding figure. The cavity of the tube is 
restricted by a complicated system of septa (s.). Slide Q. 
