REVISE THE GROUP AND TO DETERMINE ITS GEOGRAPHICAL RANGE. 337 



Whether the contents of the intestine is tilled with pellets regularly arranged or not 

 seems to me a matter of diet and of no systematic importance. 



Locality. Pigeon Isle, New Britain. 



4. Thalassema eryihrogrammon, Max Miiller. 



One specimen, from China Straits, British New Guinea. The representation on 

 Plate XXXIII. Fig. 4, is taken from a sketch made by Dr Willey on the spot from the 

 living animal. It is about natural size. He further made notes as to the colouring, 

 from which it appears that the animal is pigmented in a very lively and gay manner, 

 and with the Italian national colours. The proboscis is in the living state white, but this 

 passes gradually into green at the edges. The body is longitudinally striped in alternate 

 strips of red and white, and during the contractions rings of " rounded, red, node-like 

 prominences " are produced, probably papillae. An attempt to reproduce their appearance 

 is made in Figure 4, but they are not confined to the narrow band there indicated. 

 The tail is white and papillated. 



During life incessant peristaltic contractions passed from before backwards, and 

 during each constriction the above-mentioned red spots come into prominence. 



Locality. The single specimen was taken from sand under stones on the exposed 

 reef at Matadona. 



5. Th. kokotoniense, Fischer. 



A single specimen. The colour, in the spirit specimen, was ivory white, the longi- 

 tudinal muscles were clearly visible through the skin ; at the posterior end the skin 

 was wrinkled in circular folds, and the arrangement of the papillae produces a slight 

 circular striatum. Fig. 3, Plate XXXIII. 



The length of the trunk was, in the spirit specimen, 4 - 5 cm., its greatest breadth 

 17 cm., the length of the proboscis 1*2 cm. The latter is deeply grooved, and its edges 

 approximated in the contracted state. 



The number of longitudinal muscles was 18. The three pairs of nephridia increase 

 uniformly in size from before backward, the anterior or smallest pair opening in front 

 of the setae. 



The food in the alimentary canal was soft brown mud, arranged in definite pellets. 

 I did not find that the anal trees were longer than the body, as was the case with 

 Fischer's specimen, but doubtless their state of contraction and expansion varies. 



Locality. Blanche Bay, New Britain. 



46—2 



