CIRCULATORY APPARATUS OF THH NEMERTBA. ee 
PLATE I. 
Fic. 1.—Diagram of the vascular system in the head, the cesophageal region, 
and the intestinal region of Cephalotrix linearis (Rathke), Oerst. 
Fie. 2.—Diagram of the vascular system (1st form) in the head and cso- 
phageal region of Carinella annulata (Mont.), McInt. 
Fic. 3.—Diagram of the vascular system and the nephridial system of 
Malacobdella grossa (O. F. M.), Blainv. 
Fic. 4.—Diagram of the vascular system (2nd form) and the nephridial 
system in the head and the cesophageal region of Carinella annulata 
(Mont.), McInt. 
Fic. 5.—Diagram of the vascular system and the nephridial system in the 
head and the cesophageal region of Carinoma Armandi (Melnt.), Oud. 
Fies. 6 and 10.—Diagram of the vascular system of Tetrastemma can- 
didum (O. F. M.), Oerst. 
Fries. 7 and 10.—Diagram of the vascular system and the nephridial system 
of Drepanophorus rubrostriatus, Hubr. The portion of the median 
vessel drawn in the figure between two white interruptions lies in the 
proboscidian sheath. 
Fies. 8 and 10.—Diagram of the vascular system of Amphiporus hasta- 
tus, McInt. 
Fics. 9 and 10.—Diagram of the vascular system and the nephridial system 
of Amphiporus lactifloreus (Johnst.), Mclnt. The portion of the me- 
dian vessel drawn in the figure between two white interruptions lies in the 
proboscidian sheath. 
Fic. 10.—See Figs. 6, 7, 8, and 9. 
Fis. 11 and 12.—Diagram of the vascular system and the nephridial system 
of Polia curta, Hubr. The portion of the median vessel drawn in the 
figure between two white interruptions lies in the proboscidian sheath. 
Fies. 13, 14, 15, and 16.—Diagram of the vascular system and the nephridial 
system of Valencinia longirostris, Quatr. The portion of the median 
vessel drawn in the figure between two white interruptions lies in the pro- 
boscidian sheath. Fig. 14 immediately unites with Fig. 13. 
Fics. 17 and 18.—Diagram of the vascular and the nephridial systems of 
Lineus sanguineus (Rathke), McInt. The portion of the median vessel 
drawn in the figure between two white interruptions lies in the proboscidian 
sheath. 
PLATE II. 
Transverse Sections. 
Figs. 19—21.—Cephalotrix linearis (Rathke), Oerst. See Fig. 1. 
Fie. 19.—Through the precerebral portion. 
Fic. 20.—Through the cerebral portion (cerebral ring). 
