566 PEor. w. A. heedman's eetised 



( Dorsal tubercle with long axis parallel to long axis of body 2 



1 \ Dorsal tubercle with loBg axis transverse to long axis of body. 

 I G. Morgatcs, Lac.-Duth. (Med.) 



(Tentacles slightly branched, dorsal lamina strongly toothed. 

 C. aiypendicidata. Heller. (Med.) 

 Tentacles well branched, dorsal lamina slightly toothed. 

 C. Korotneffii, Lac.-Duth. (N.W. 

 Eur. & Med.) 



MoLGiriiA *, Forhes, 1853. 



jSo^y usually globular, attached or free, often encrusted with 

 sand and mud. Branchial aperture 6-lobed, atrial 4-lobed ; lobes 

 not laciniated. 



Test usually thin, but tough ; often with hair-like processes on 

 the outer surface. 



Mantle thin and membranous; musculature usually feeble, 

 consisting chiefly of long radiating bundles arising from the bases 

 of the siphons, and of short fusiform clumps of fibres scattered 

 through the mantle. 



Branchial sac with 6 or 7 longitudinal folds on each side. 

 Stigmata more or less curved, coiled spirally in infundibula. 



Tentacles compound. 



Alimentary canal on the left side of the branchial sac. 



Gonads developed on both sides. 



Senal organ in the form of a erescentic sac placed in the 

 centre of the right side of the mantle, and usually containing 

 concretions. 



The numerous species f of Molgula "which have been suflSciently 

 characterized may be separated as follows '. — 



("With 6 folds on each side of the branchial sac I 



I With 7 folds 2 



r Lower ends of the folds provided with tongue-like processes. 

 It M. euprocta, v. Dr. (Med.) 

 [ No such processes present 3 



* Includes Gymnocystis, Giard, and Anurella, Lac.-Duth. 



t Molgula fsammodes was described by Traustedt in 1880, but was not in- 

 cluded in the table of species of the genus given by the same author in 1882, 

 and consequently lias probably been given up. According to Carus, it is the 

 same as M. occulta., Kupff. 



