THE ANATOMY OF PHURONIS AUSTRALIS. 157 
instance of a double tentacular vessel : one part coming from the distributing 
vessel, the other going to the recipient vessel. s/. Skeleton of the lophophore. 
Fie. 27.—A schematic drawing of a nephridium, compiled from an exami- 
nation of a series of transverse and longitudinal sections. ze. 0. Nephridio- 
pore. ze. d. Nephridial duct. ze. / Large funnel, which communicates with 
the rectal chamber. ze. /’. Smaller funnel, which communicates with one of 
the cesophageal chambers. 
Fic. 28.—A portion of the wall of the nephridial duct. 
Fic. 29.—A part of the edge of a large nephridial funnel. 
Fic. 30.—A portion of a longitudinal section through the oral region of 
the body. (Compare the left side of Fig. 15, which is taken from the same 
series.) The nephridium of this side is seen opening into the rectal division 
of the ccelom. J. One of the lateral mesenteries, separating the cesophageal 
chamber on the left from the rectal chamber on the right of it. 2. Portion 
of nerve ring—the “sense organ.” ze. 7. The large nephridial funnel. o. 
Ova. &. Rectum. 8. Septum. 7¢. Base of tentacle. 
Fies. 31 and 32 are two transverse sections of the oral region of the 
body ; they are very nearly consecutive sections selected from a series to show 
the two nephridial funnels. 
Fig. 31. This is the lower (more proximal) of the two; it is taken along 
the line XY Y in Fig. 28, and includes a portion of the large funnel 
only. af. Afferent blood-trunk. 4. Lateral mesentery. ze. d. Ne- 
phridial duct. me. Large nephridial funnel. 2. 7. Nephridial ridge. 
ws. (Esophagus. «@. ch. @sophageal chamber. 7. Rectum. +. ch. 
Rectal chamber. 7.7. Rectal ridge. 7. v. Recipient vessels. 8. 
Septum. s.s. Supraseptal division of ccelom. 
Fig. 32 is taken along the line 4 B, Fig. 23, immediately below the 
central part of the septum, and shows both nephridial funnels of 
one side. d.v. Distributing vessel. xe. d. Nephridial duct, cut 
through twice. ze. Larger nephridial funnel, communicating with the 
rectal chamber. ze. 7’. Smaller funnel opening into the cesophageal 
chamber. 7. Rectum. 7. ch. Rectal chamber. 7. v. One of the 
recipient vessels. §. Septum. ss. Supraseptal ccelom. 
Fic. 33.—A transverse section through the aboral region of the body, 
showing the gonads. af. Afferent blood-trunk. 4.7. Body wall. ca. Celom. 
ef. Efferent blood-trunk. 47. Its branches, on the walls of which are deve- 
loped the reproductive cells, forming o. ovary, and 7. testis. J. Intestine. 
st. Stomach. sf. s. Blood sinus around it. zt. Intestine. 
Fic. 34.—A portion of the ovary more highly magnified. w. Wall of blood- 
vessel. c. ep. Celomic epithelium surrounding it. o. ovum, surrounded by 
f. capsule-cells. 
Fie, 35.—Longitudinal section through the terminal pit. 4. ¢. Basement 
