108 MR. E. S. GOODRICH ON SYLLIS VIVIPARA. 
ova can be seen loose in the body-cavity, the segmental gonads 
have in places very much the appearance of testes, the cells at 
the periphery being numerous and small; but I have never found 
ripe spermatozoa, and the point remains doubtful. It is in the 
hope of inducing some observer to settle this interesting question, 
that I publish the foregoing observations. 
BIBLIOGRAPHY. 
(1) Enters, E—Die Borstenwiirmer. Leipzig, 1864-8. 
(2) Krony, A.—‘ Ueber ein lebendiggebirend Syllisart.” Arch. 
fiir Naturg. voi. xxxv., 1869. 
(3) Levinsen.—“ Syst. overs. over de Nordiske Annulata.” 
Vidensk. Meddelelser, Copenhagen, 1883. 
(4) Matraguin, A.—Les Syllidiens. Lille, 1893. 
(5) Mesuit, F., & M. Cauttery.—“ Les formes épitoques des 
Annélides.’’ International Congress of Zoology, 1898. 
(6) Satna-JosEpH, Baron de.—‘‘ Sur les Annélides poly chétes des 
7 cotes de Dinard.” Ann. Se. Nat. vol. xvu., 1894. 
(7) Scuréprr. — Anatomisch-histologische Untersuchung von 
Nereis diversicolor, O. Fr. Mill. Kiel, 1886. 
EXPLANATION OF PLATE 13. 
(All the figures are of Syllis vivipara, Krohn.) 
Fig. 1. Enlarged dorsal view of an adult specimen containing several weil- 
developed young. d.c., dorsal cirri; ph., pharynx; 7., intestine ; 
Y-) young: 
2. Ventral view of the head, showing the mouth (m.) and palps (p.). 
3. Sketch of the pharynx in the extended condition. 
4, Ventral view of a portion of three posterior segments containing ova 
and developing embryos. pp., parapodium ; s., septum; 7., intestine ; 
e., embryo ; d.c., dorsal cirri; 0., ovum. 
5. Transverse section of an adult worm, showing two embryos in the 
celom. w., body-wall; 7., intestine ; pp., parapodium; y. y., young. 
6. Distal end of a cheta. 
