46 Cincinnati Society of Natural History. 
FIGURE IX.— Cross section of an injected gill pouch of Adellostoma 
(<8). Taken perpendicular to the gill axis, about at the center. 
Camera lucida outline. 
mw, muscular wall of gill pouch. gp, cavity of gill, into which gill 
leaflets project. 
FIGURE X.— Branchial region of Sdellostoma dombeyit (1%). 
Ventral view. Body wall opened by a median longitudinal incision, and 
the lateral flaps folded back. Anterior lobe of the liver removed to 
expose heart. Arteries colored red. Veins blue. 
Avy, ventral aorta. af. br, afferent branchial arteries. x, on last affer- 
ent branchial artery indicates position of ‘‘ductus Botalli.’’ ic, ‘‘inter- 
costals’’ (arteries red, veins blue). S, Sinus venosus. jv, inferior jugular 
vein. acl, left anterior cardinal vein. supr. int, supra-intestinal vein. 
A, auricle. V, Ventricle. H, portal heart. Lp, posterior lobe of liver. 
gb, gall bladder. mnr, mnl, right and left mesonephros. pnr, pnl, 
right and left pronephros. pef, pericardio-peritoneal foramen (dotted 
outline). sgl, slime glands. ocd, oesophago-cutaneous duct. cm, 
‘“‘club-muscle.’’ _gpe, spe, external gill passages. 
FIGURE XI.— Lateral view of the viscera of Bdellostoma dombeyi left 
side, including ventral view of the left half of the body wall, which has 
been laid back (<1). 
-cpa, anterior branch of common portal vein. cpp, posterior branch of 
common portal vein. Jv, inferior jugular vein. acl, left anterior cardi- 
nal. ha, hp, anterior and posterior hepatic veins. cpa, cpp, anterior 
and posterior branches of common portal vein. ocl, left posterior cardi- 
nal. supr. int, supra-intestinal vein. sub. int, sub-intestinal vein. La, 
Lp, anterior and posterior lobes of the liver. .pnl, left pronephros. mn, 
left mesonephros. ic, ‘‘intercostal’’ vessels. Otherwise as previously. 
FIGURE XII.— Mid abdominal region of Bdellostoma dombeyt, show- 
ing ventral view of the left side of the body wall, and a lateral view of 
the intestine and mesentery. The latter have been laid over upon the 
right side of the body wall, and the mesentery stretched out (2). 
r, renal branches. s, somatic branches (red, arteries; blue, veins). 
pel, per, posterior cardinal veins, left and right. mes, mesenteric 
arteries. vg, vagus nerve. sn, ‘‘intercostal’’ nerve. Otherwise as 
previously. ; 
FIGURE XIII.— Diagram of one half of a section through the gill 
pouch of &dellostoma, parallel with the axis of the gill. Afferent ves- 
sels red. Efferent vessels blue. 
af. br, afferent branchial vessel. ef. br, efferent branchial. cap, 
capillary network. 
FIGURE XIV.—See Fig. VIII. 
FIGURE XV.— Diagram of a cross section through the body of 2de//o- 
stoma, just behind the liver. 
ntc, notochord. spc, spinal cord. s, somatic branches. ic, ‘‘ inter- 
costals.’’ d, dermal branches. my, myotomes. Otherwise as previously. 
34 
