COLLECTION OF NEMERTEANS FROM SINGAPORE. 113 



in members of tlie same genus. Other features which may 

 prove of taxonomic value, and to which I venture to draAv 

 attention in the following list, are : 



(1) The presence or absence of a frontal organ. 



(2) The presence or absence «, ^ cephalic vascular loop. 



(3) The extent of the rhynchocoelom. 



(4) The minute structure of the cutis. 



(5) Structure of the cerebral organ. 



Moreover it would greatly facilitate the labours of the 

 systematists in this group if collectors were able to make a 

 coloured sketch of the living animal, and to make particular 

 note as to the presence or absence of a caudal appendage 

 whilst the animal is still living. A word on preservation may 

 not be out of place here. 



Excellent results are to be obtained by stupefying the Avorms 

 in a 1 per cent, solution of chloral hydrate in sea water, and 

 subsequent treatment with saturated corrosive sublimate. 

 Particular care should be taken that the anterior few centi- 

 metres of the animal are preserved as straight as possible 

 by killing the animal on a glass slide or some other such 

 means. Since this region must be cut into serial sections the 

 labour-saving importance of this precaution can hardly be 

 exaggerated. 



HETERONEMERTINI. 



EUPOLIID^. 



Eupolia melanogramma, mihi (= E. quinquelineata. 



Burger) . 



Five specimens of this large and striking worm were obtained, 

 showing considerable variation in the completeness of the five 

 dorsal black lines. 



(1) Specimen, 32 X 6 mm., having the five lines well 

 marked for the whole length of the body except near the 

 posterior end, where the outer two are occasionally broken. 

 All lines of nearly equal thickness. 



VOL. 44, PABT 1. — NKW SERIRS, H 



