COLLECTION OF NEMERTEANS FROM SINGAPORE. Ill 



On a Collection of Nemerteans from Singapore. 



By 

 R. C. Piiiiiiott, B.A. 



With Plates 5—8. 



The Nemerteans described below were collected by Mr. 

 F. P. Bedford and Mr. W. F. Lanchester during- a year's stay 

 in and near Singapore. The}' comprise ten species_, nine of 

 which have not hitherto been described. All belong to the 

 order Hoteronemertini, whilst eight out of the ten come into 

 the family of the Lineidas. It is worthy of note that no speci- 

 mens of Drepanophorus were found, seeing that in collections 

 from adjacent seas, previously described by Biirger (1) and 

 myself (7), they form a marked constitvient of the Nemertean 

 fauna. It will be noticed that I have assigned all the Lineidte 

 here described to the genus Cerebratulus. This I have done 

 not because I am convinced that they approximate more 

 closely in every case to the forms already placed in that 

 genus, but because of the difficulties of distinguishing, in 

 preserved specimens only, the three genera, Linens, Cerebra- 

 tulus, and Micrura. This difficulty was dealt with in Hu- 

 brecht's case (5) by recognising in the family only the single 

 genus Cerebratulus. As, however, the family already contains 

 more than eighty species, with the probability of large addi- 

 tions in the near future, it seems expedient to adhere to the 

 present arrangement of genera, in spite of its unsatisfactor}'- 

 character, until the accumulation of anatomical data be 

 sufficient to warrant revision. The caudal appendage forms 

 the chief distinction between the genus Lineus on the one 



