298 SIR C. ELIOT AND T. J. EVANS. 
arterial system are, therefore, unnecessary. All that is 
required is sufficient movement to keep the blood from 
stagnating. But the extensive venous system is provided 
with valves which we have not noticed in other molluscs or 
seen described. They, presumably, serve to regulate and 
control the circulation. 
EXPLANATION OF PLATES 15 anp 16, 
Illustrating the paper by Sir Charles Eliot and Mr. T. J. 
Evans on “Doridoeides gardineri: a Doridiform 
Cladohepatic Nudibranch.” ; 
PLAT 15. 2 
Fic. 1.—Doridoeides gardineri. 4. dorsal, B. ventral view of whole 
animal. a. Mouth. 4. Genital orifices. c. Anus. d. Accidental folds of 
foot. The specimen has been selected as showing the orifices, but in its 
natural shape the foot appears to be triangular, with a straight broad margin 
below the mouth. 
Fie. 2.—Transverse section of dorsal body-wall. 
Fie. 8.—Central nervous system of Doridoeides gardineri. a. Cerebro- 
pleural ganglia. . Pedal ganglia. c. Eyes and olfactory ganglia. d@. Buccal 
ganglia. 
Fie. 4.—a. Jaw. 4. Denticulate edge of ditto. 
Fie. 5.—a. The radula seen from above. 4. Side view of median tooth. 
c. Side view of first lateral. d. Side view of fourth lateral. 
Fie. 6.—Alimentary system. @. Csophagus. 4. Anterior portion of 
stomach. ec. Posterior do. d. Intestine. e. Right liver duct and branches. 
J. Posterior do. g. Left do. 
PLATE 16. 
Fie.7.—a. Ventricle. 4. Auricular ventricular valve. c. Auricle. d. Auri- 
cular extension. ¢. Aorta. /. Renal pericardial opening. g. Line of adhe- 
sion of auricle to ventricle. zy 
Fie. 8.—Vein showing valvular construction. 
Fie. 9.—Reproductive system. a. Hermaphroditic gland. 4. Duct of do. 
ce, Ampullaofdo. d. Vas deferens. e. Penis. “ Bifurcation between male 
