1907.] NATUUAT. SCIENCES OF IMII LADKM'III A. 407 



TuuLKU, -M. IDUl. Zur Aualoinir Mm I'anuopliorus iiitfrnn-ilius Uocvc. ^Jcn. 



Zeit. /. Naturw., lid. 30. 

 ToTZ.vuKR, R. J. 1902. Xicron- und (iouadvcrliiiltiiissc \un Ualioti.s. Zoul. 



Anz.,Bd.2ry. 

 Wegm.wn, II. ISSI. Cdiitril). a riiistoin* naturcll<' drs Ilalintidcs. ArcJi. 



ZooL cvprr. (2), T. 11. 

 Wo()i)\v.\HD, M. F. 1901. Tlie Anatomy of Plrunitoinaria licrichii. (Juart. 



Jour, ^[ic. Sri., Vol. 44. 



EXPLAXATIOX OF FIGURES. 



The loUowinir IcIUt^ liavc boon used in tho oxplaiiation of tlic (ijiures: 



-l, antorior aorta. LI, blood sinus of lot't kitlnev. 



.40, main aorta. W, vestibule of right kidney. 



BA, buccal aorta. L/, liver. 



COL, cohnnellar muscle. LU, left ureter. 



EF, loft efferent branchial sinus. PAL, right pallial .sinus. 



GA, g(>nital aorta. R, rectum. 



GO', gonoduct. RE, RI^', renopericardial canals. 



GO, gonoduct optuiing into right kid- RK, RK' , kidney lobes. 



ney. RU , right ureter. 



/, intestine. VL, aortic valve. 



EXPL.\NATI0X OF PlATE XXX. 



Fig. 1. — Section through both kidneys of specimen of Ilaliolis rufescens, 1.5 cm. 

 long, viewed posteriorly. //F, hypobranchial gland; IC, right kidney 

 cavity; RD, end of radula; ST, stomach. 



Fig. 2. — Portion of //. rufescens showing pericardium, left kidney, sinus and 

 gonoduct. COL, columoUar muscle ; 0, gonad. 



Fig. 3. — Seventh section anterior to fig. 1. E, right efTerent branchial sinus; 

 P', right pallial sinus. 



Fig. 4. — Section through right renopericardial canal and gonoduct of H. cracher- 

 odii, 3 cm. long. 



Fig. 5. — Sixth section anterior to that shown in fig. 3, showing opening of gono- 

 duct into right kidney. 



Fig. 6. — H. rufescena, dorsal wall of mantle reflected and basi-branchial sinus 

 opened. Af, Af, right and left afferent branchial sinuses; HyG, hypo- 

 branchial gland; LCt, left ctenidium; LU, left ureter; MC, mantle cavity; 

 XV, veins from right kidney; R, rectum; Si, branchial sinus; V, valve. 



