W. G. Van Name — Bermuda Ascidians. 333 



Before proceeding to the description of the species, I wish to 

 express my thanks to Prof. A. E. Verrill for the use of his material 

 and for much valuable advice and assistance. I am also indebted 

 to Prof. H. C. Bumpus and Prof. H. M. Smith, of the United States 

 Fish Commission, for the opportunity of working at the Fish Com- 

 mission laboratory at Wood's Hole, where a portion of this work was 

 done, and also to Prof. S. I. Smith and Dr. W. R. Coe of Yale 

 University, and Mr. T. Goodwin Gosling of Hamilton, Bermuda. 



^"illard G. Van Name. 



New Haven, Conn., December, 1901. 



Descriptions of Species. 



ASCIDIiE COMPOSITE. 



Fixed ascidians which reproduce by gemmation, forming colonies 

 the individuals of which remain united together by stolons or by 

 being more or less completely buried in the common test. This 

 group is usually regarded as a sub-order. 



Family CLAVELINIDiE Forbes, 1853. 



Body attached by the posterior end or more or less entirely buried 

 in a creeping basal stolon or common stolonial mass, from which the 

 young zooids form by gemmation. Test usually gelatinous, aper- 

 tures simple, or (rarely) lobed. 



Branchial sac not folded, with or without longitudinal bars. 



Dorsal lamina represented by or provided with languets. 



Alimentary canal extending beyond the thorax to form a distinct 

 abdomen. 



Reproductive organs in or beside the intestinal loop. 



Genus Claveiina Savigny, 1816. 



Zooids oblong or club-shaped, nearly independent, each enveloped 

 in its own test and connected by stolons arising from the posterior 

 end. 



Apertures not lobed. Mantle muscles mainly longitudinal. 



Branchial sac with straight stigmata, with no internal longitudinal 

 bars or papillae, but with horizontal membranes. 



The Bermuda species of this genus belongs in Herdman's sub- 

 genus Stereoclavella, which differs from the typical Claveiina in 

 having the stolons united in a basal thickening or mass of test. 



