40 



K, ]\[ITST'KTTRT : STUDIES ON 



Gonu^ Mesothuria Lt'dwig 1894. 



10. Mesothuria deani, sp. n. 



(Textfig. 9). 

 Spocimeiis examined : — 



Description : — Body almost cylindriciil. No mavyinal l)ordor. 

 Skin much rumpled and full of creases. Color at present deeji 

 brown, probably purple or violet in iife-tinio. ^loutli distinctly 

 ventral, anus terminal. 



Ambulaeral appendages distril)uted uniformly ovei- the whole 

 body. Pedicels on lak'ral ambulacra larger than those in other 

 parts of the body, forming thi'ee or four irri'gular rows. The 

 middle parts of the ventral surface with smaller pedicels, which in 

 some specimens could l)o easily recognized, but were in one speci- 

 men so minute that i thought for a long time they were here 

 entirely absent. Por.sal surface with small pedicels (1.04x0.32 

 mm.) scattered all over the amlmlacra as well as the intei'am- 

 bulacra. 



(ienitiil bundle one on the left. Calcareous ring as in texttig. 

 9 a. Polian vesicle one, 9 mm. long. No tentacular ampullae. 



