EUROPEAN NEMERTEANS. 96 



gement, Valencinia having — as mentioned above — a 

 simple, strongly ciliated opening to this duet, Carinella 

 not being possessed either of a third posterior ganglionic 

 lobe , nor of a duct leading into the nervous tissue, although 

 exteriorly a simple transverse furrow in the epiderm may 

 be detected and finally Cephalotrix , showing no trace at 

 all either of external furrow, duct or posterior brain-lobe. 

 By these characters there appeared to be two principal 

 modifications of structure among the genera belonging to 

 the Palaeonemertini'. on one side Cephalotrix and Ca- 

 rinella, on the other side Valencinia and Polia. The two 

 latter genera were higher differentiated , and of these Polia 

 showed certain unmistakeable afiinities to the Hoplo- 

 nemertini. 



Curiously enough one of the species about to be des- 

 cribed, unexpectedly bridges the interval existing between 

 Carinella on the one hand and Polia on the other , at 

 the same time proving the suborder of the Palaeone- 

 mertini to be a natural arrangement , which is in accor- 

 dance with the real affinities of the species therein con- 

 tained. The new species, for which I propose the name 

 of: 



Cafinella inexpectata n. sp. 



has more the external appearance of a Polia than of a 

 true Carinella , the head not being by any neans widened 

 out anteriorly into the more or less spade-like shape which 

 it assumes both in Carir^ella annulata and Carinella po- 

 lymorpha. Moreover a closer inspection reveals a lateral 

 opening on both sides of the head , situated in the middle 

 of a transverse groove which ventrally appears to coa- 

 lesce with that of the other side, whereas dorsally it 

 extends to close up to the median line. This transverse 

 groove is provided with a set of small secondary grooves 

 in the way described above for Polia and the Hoplo- 

 nemertini. On the dorsal surface about six of these 



Notes from the Leyder» IVIuseum , Vol. II. 



