On Brinkmann's System of the Nemertea 

 Enopla and Siboganemertes Weberi, n.g.n.sp. 



By 

 Dr. Gerarda Stiasny-Wijnhofl, Leiden. 



With 26 Text-figures. 



All text-books of zoology give the Nemertean system 

 as Burger published it several times in his monographs 

 on this subject (6, 7, 8). The old systems of Schultze, 

 Mcintosh, Hubrecht have been forsaken, and our text- 

 books do not divide the Nemertini any more in Anopla 

 and Enopla, or Palaeonemertea, Hoplonemertea, and Schizo- 

 nemertea. The armature of the proboscis and the arrangement 

 of the cephalic slits are believed to be of secondary importance, 

 and Biirger divided the Nemertini into four orders, three of 

 which, his Protonemertini, Mesonemertini, and Metanemertini 

 are supposed to be closely related by having a body-wall that 

 consists of an epithelium, a basement membrane, and two mus- 

 cular layers. Benham, in Eay Lankester's ' Treatise on 

 Zoology ', unites them as Dimyaria, and his Trimyaria consist 

 of one order only, the Heteronemertini Biirger. The Proto- 

 nemertini are Mcintosh's family Carinellidae, Meso- 

 nemertini are his family Cephalotricidae and the genus 

 Carinoma (H^ibrecht) ; Metanemertini is a new name for 

 Hoplonemertini (Hubrecht) or Enopla (Max Schultze), and 

 Heteronemertini are Hubrecht's Schizonemertini and his 

 families Eupoliaidae and Valenciniaidae. Everybody agrees 

 that the last two families are more nearly related to Lineids 

 and Cerebratulids than to the Protonemerteans, and their 

 enclosure in the order Heteronemertini seems to be well 



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