Bt WILLIAM A. IIASWELL, M.A., B.Sc. G37 



In one of tlie specimens, which I dissected, the anterior portion 

 of the alimentary canal was found to be invaginated for a con- 

 siderable distance within the posterior portion, shewing a corres- 

 ponding power of eversion which, however, was not observed in 

 the living specimens. Following the thin-walled oesophagus is a 

 very short gizzard-like portion with thick walls. To this succeeds 

 the wide intestine which presents a thick epithelial lining made 

 up of closely-packed elongated, cylindrical cells with large and 

 distinct nuclei ; in the hinder region of the body the intestine 

 becomes extremely narrow and the epithelial lining very thin. 

 Throughout its length the alimentary canal seems to be surrounded 

 by a vascular plexus. The nerve cord is remarkable on account 

 of the trigonal form of its lateral halves. 



There are two points in which this species differs from the 

 genus AiiqjJiictels us defined by Grube, viz. — in the oral tentacula 

 being pinnate, and in one pair of branchiae being foliaceous ; but 

 it is certainly in most other points a very near ally of Amphicteis 

 JPliilippiiiarum, of Grrube. 



EXPLAIVATIO:!^ OF PlaTE. 



Pig. 1. — Operculum of Eupomatus elegaiis x 15. 

 „ 2. — Anterior region of the body of Ammochares tenuisy 



magnified. 

 „ 3. — Posterior region of the body of Clymene integrinatis X 4. 

 ,, 4. — Anterior region of the same. 

 ,, 5. — Anal disc of the same. 

 ,, G. — Ventral uncinus of the same. 

 ,, 7. — Head and anterior region of Sermella aitstraliensis ironi 



the ventral aspect, magnified. 

 „ 8. — The same, lateral view. 



5, 9. — Operculir setae of the same, highly magnified. 

 „ 10. and 11. — Opercular uncini of the same. 

 „ 12. — Amp)liicteis foliata, dorsal view, magnified. 

 „ 13. — Head of the same from the ventral side, more highly 



magnified. 



