REVISE THE GROUP AND TO DETERMINE ITS GEOGRAPHICAL RANGE. 353 



Species 31. Thalassema viridis. Verrill. 



Verrill. P. U.S. Mils. Vol. II. 1879, p. 183. 



Webster. International Dictionary, under "Spoon-worm," p. 1391, Figure. 



Length of body, about 6 ram. Body round, thick, about twice as long as broad, 

 largest and obtusely rounded posteriorly. Proboscis long and slender and somewhat 

 spoon-shaped at the end. 



Colour, bright grass green in the living specimens. 



The skin is "minutely granulous in appearance, the granules in circular lines." 



Longitudinal muscles. Condition unknown. 



Nephridia. Unknown. 



Locality. Off Head Harbour, Campo Bello Island, U.S.A. Found in holes in bard 

 nodules of blue clay at 77 fathoms. 



Professor Verrill has been kind enough to write to me that this species seems 

 very rare, at all events it has been very rarely taken. 



48—2 



