CYNTHIA. 591 



on very contractile, naked tubes, the oral six-lobed, the 

 anal four-lobed. 



Ex. M. arenosa, Alder and Hancock, pi. 133, fig. 2. 



The species of Molgula have been found between tide- 

 marks in the laminarian zone, and as deep as twenty-five 

 fathoms. The surface is usually covered with particles of 

 sand and other substances. Except in the number of lobes 

 of the oral aperture, Glandula of Stimpson does not seem 

 to differ from this genus. 



Species of Molgula. 



arenata, Stimp. producta, Stimp. 



arenosa, Aid. and Sane. tubulosa, Rathke. 



oculata, Forbes. 



Sub-gen. glandula, Stimpson. 



Branchial orifice with four lobes, the anal square ; branchial 

 sac with a few distant plications. 



fibrosa, Stimp. mollis, Stimp. 



Genus CYNTHIA, Savigny. 



Body sessile, covered with a coriaceous tunic ; oral and 

 anal orifices four-lobed; branchial sac longitudinally pli- 

 cated, surmounted by a circle of tentacular filaments ; 

 meshes of respiratory tissue not furnished with papilla?. 

 Ovaries usually two. 



Syn. Stycla, Csesira, Savujny. ? Fodia, Bosc. 



Ex. C. moms, Forbes, pi. 133, fig. 3. 



