640 INVERTEBRATE MORPHOLOOT. 



3. Suborder Pyrosomidw. — Colonial forms, the various in- 

 dividuals imbedded in a common test, and opening into 

 a common cloaca ; pelagic ; with alternation of genera- 

 tions. Pyrosoma. 

 3. Order 37iah'aceffl.— Simple pelagic forms, with alternation of 

 generations. Salpa, Doliolum, Octacnemus. 



LITERATURE. 



HBMICHOUDA. 



W. C. Mcintosh. Report on Cephaludiscus dodecalophua, Mcintosh, a New 

 Type of the Polyzoa. Scieut. Results of the Voyage of H.M.S. Chal- 

 lenger, XX, 1887. 



S. F. Harmer. Appendix to Report on Cephalodiacus. Scient. Results of the 

 Voyage of H.M.S. Challenger, xx, la87. 



E. K. Lankester. A Contribution to the Knowledge of Ehabdopleura. Quar- 

 terly Jouru. Microscop Science, xxiv, 1884. 



G. H. Fowler. T/ie Morphology of Rhabdopleura Normanni Allm. Festschrift 

 fur R. Leuckart. Leipzig, 1892. 



A. Agassiz. The History of Balanoglossus and Tornaria. Memoirs American 

 Acad. Arts and Sci., ix, 1893. 



W. Bateson. TJie Early Stages in the Development of Balanoglossus (sp. incert.). 

 Quarterly Journ. Microscop. Science, xxiv, 1884. 



The Later Stages in the Development of Balanoglossus Kowalewskii, 



with a Suggestion on the Affinities of the Enteropneusta. Quarterly Journ. 

 Microscop. Science, xxv, Suppl., 1885 ; xxvi, 1886. 



The Ancestry of the Chordata. Quarterly Jouru. Microscop. Science, 



XXVI, 1886. 



T. H. morgan. The Growth and Metamwphosis of Tornaria. Journ. of Mor- 

 phology, V, 1891. 



J. W. Spengel. Die Enteropneusten. Fauna und Flora des Golfes von Neapel. 

 Monogi-., XVIII, 1893. 



T. H. Morgan. The Development of Balanoglossus. Journ. of Morphology, 

 IX, 1894. 



CEPHALOCHOBBA. 



W. Eolph. Untersuahungen iXber den Bau des Amphioxus laneeolatus. Mor. 



phologisches Jahrbuch, 1876. 

 B. Hatschek. Siudien iiber Entwieklung des Amphioxus. Arbeiten aus d. 



Zool. Inst. Wien, rv, 1881. 



E. Ray Lankester. Contributions to the Knowledge of Amphioxus laneeolatus, 



Yarrell. Quarterly Journ. Microscop. Science, xxix, 1889. 

 B. Iwoff. Ueber Bau und Entwieklung der Chorda von Amphioxus. Mitth. a. 



d. Zoolog. Station zu Neapel, ix, 1889. 

 E R. Lankester and A. Willey. T'he Development of the Atrial Chamber of 



Amphioxus. Quarterly Journ. Microscop. Science, xxxi, 1890. 



F. E. Weiss. Excretory Tubules in Amphioxus laneeolatus. Quarterly Journ. 



Microscop. Science, xxxi, 1890. 



