W. R. Goe — Anatomy of Cerebratulus lacteus. 



507 



LITERATURE. 



There is given below a list of a few of the more iroportant recent papers on Nemer- 

 teaD anatomy which are referred to in the text : 



1. A, E. Verrill, The Marine Nemerteans of New England. Transactions of the 



Conn. Academy, viii, 1892. 



2. Otto Burger, Unters. iiber die Anatomie u. Histologic der Xemertinen nebst Beitr. 



zur Systematik. Zeits. f. wiss. Zoologie, 1, 1890. 



3. Otto Biirger, Die Enden des Exkretorischen Apparates bei den Nemertinen. Zeits. 



f. wiss. Zoologie, liii, 1892. 



4. J. V. Kennel, Beitrage zur Kenntniss der Nemertinen. Arbeiten aus dem Zool.- 



Zootom. Inst, in Wiirzburg, iv, 187^-1878. 



5. Rudolph Dewoletzky, Das Seitenorgan der Nemertinen. Arbeiten der Zool. Inst. 



zu Wien, vii, 1888. 



6. W. C. Mcintosh, British Annelids ; Part I, The Nemerteans. Ray Society, 1873, 



7. A. A. W. Hubrecht, Voyage of H. M. S. Challenger, 1873-76. Zool., xix, 1887. 



8. A. A. W. Hubrecht, Der Exkretorische Apparat der Nemertinen. Zool. Anzeiger, 



1885. 



9. A. C. Oudemans, Circulatory Apparatus of the Nemertea. Quart. Journ. Micros. 



Sciences, xxv, 1885. 



10. T. H. Montgomery, Stichostemma eilhardi. Zeits. f. wiss. Zoologie, lix, 1895. 



11. L. Joubin, Les Nemertiens. Faune Frangaise. Paris, 1893. 



12. Max Schultze, Beitrage zur Naturgeschichte der Turbellarien. Greifswald, 1851. 



13. 0. Semper, Die Yerwandtschaftsbeziehungen der gegliederten Thiere. Arbeiten 



aus dem Zool.-Zoot. Inst, in Wiirzburg, iii, 1876-1877. 



14. A. Lang, Die Polycladen des Golfs von Neapel. Fauna und Flora des Golfs von 



Neapel, xi, 1884. 



15. W. Salensky, Bau und Metamorphose des Pilidiums. Zeits. f. wiss Zoologie. 



xliii, 1886. 



EXPLANATION OF PLATES. 



"With few exceptions the iigures were drawn with the aid of a camera-lucida. 

 the plates the following reference letters are used: 



On 



a, " rhabdite-cell " from the proboscis- 

 epithelium. 



a', gland-cell from same. 



av, anastomosing vessel between lateral 

 and dorsal vessels in intestinal region. 



&, blood-vessel. 



&&, buccal blood-vessel. 



&c, ventral commissure of cephalic 

 lacunae. 



6m, baseaient membrane. 



6r, brain. 



c, connective tissue. 



ccj ciliated canal in side-organ; cc\ pos- 

 terior end of same. 



ce, ciliated epithelial cell. 



ci, cilia. 



cZ, cephalic lacuna. 

 cm, circular muscles. 

 cm\ outer layer of circular muscles in pro- 

 boscis, and in body-wall in Carinella. 

 CO, dorsal cross of fibres in proboscis. 

 co', ventral cross of fibres in proboscis. 

 cs, inner sheath of connective tissue. 

 cs', outer sheath of connective tissue. 

 CM, cutis. 



cv, commissure of vagus nerve. 

 d, dorsal brain-lobe. 



db, dorsal blood-vessel. 



dc, dorsal commissure of brain-lobes. 

 dm, dorso-ventral muscles. 



