[huntsman] the ASCI DI an FAMILY CAESIRIDAE 233 



bula flattened out. This group, as well as the genus Molgula, as the 

 latter would then be, seems quite heterogeneous and unnatural. 

 The type, M. eiigyroides (Traust.) possesses very curious gonads, and 

 on this basis the genus doubtless will be a valid one, but the structure 

 of these gonads has not yet been sufficiently described. 



Similarly it has been impossible to consider Ascopera Herdman, 

 and Bathypera Michaelsen in the classification here proposed, owing 

 to their structure being so imperfectly known. 



Literature References 



Baster, J. 



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 Fleming, J. 



1822. The Philosophy of Zoology. Vol. 2. 

 Forbes, E. 



1848. In Forbes and Hanley, British Mollusca, Vol. I. 

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1872. Étude critique, etc. Arch. Zool. Exper., t. I. 

 Hartmeyer, R. 



1914. Diagnosen einer neuer Molgulidae, etc. Sitzb. Gesell. 

 naturf. Freunde, Berlin, Jg. 1914. 

 Herdman, W. A. 



1882. Report on the Tunicata, etc., I. Zool. Challenger Exped., 

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1877. Histoire des Ascidies simples, etc., II. Arch. Zool. 

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1914. Ueber einige westafrikapische Ascidien. Zool. Anz. Bd. 

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1918. Die Ptycobranchen und Diktyobranchen Ascidien, etc. 

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