NOTES ON THE ANATOMY OF STEENASPIS. 243 



Summary. 



It has been shown in the foregoing account that the cavity 

 of the genital sac of Sternaspis communicates with the body- 

 cavity ; that the nephridium is provided with a small ciliated 

 funnelj possesses a lumen, and in one region, at all events, is 

 ciliated internally. The complex granules of the nephridial 

 cells have been described in detail; experiments have been 

 recorded as to the solubility in certain reagents of the granules, 

 the cuticle, the ventral shield, and the chsetaj. A detailed 

 account of the muscular system has also been given. 



List of References, 



1. Beddard, F. E. — ' Monograph of the Order Oligocheeta,' Oxford, 1895. 



2. Goodrich, E. S. — " Notes on Oligochaetes," ' Quart. Journ. Micr. Sci.,' 



vol. xxxix, 1896. 



3. RiETSCH, M. — "6tude sur le Sternaspis scutata," ' Ann. Sci. Nat.,' 



6e sen, Zool., vol. xiii, 1882. 



4. Robinson, A. — " On the Position and Peritoneal Relations of the 



Mammalian Ovary," ' Journ. Anat. and Phys.,' vol. xxi, 1887. 



5. Vejdovsky, F. — " (Jntersuchungen iiber die Anatomic, &c., von Ster- 



naspis," ' Denkschr. d. Wien. Akad. Math. Naturw. CI.,' vol. xliii, 

 1882. 



