634 A. E. Verrill — Tiirhellaria, Nemertina, and 



Several species occur on the U. States east coast; among them are 

 G. WehsteriY . ; G. maculata V., sp. nov., which is a stouter species, 

 but similar to the last ; has a larger and wider head and larger eyes, 

 and a large buccal segment, on which there are four dark ovate 

 spots ; the antennse and cirri are longer and have a middle band of 

 brown with acuminate, acute tips ; and G.fusca V., sp. nov., which is 

 distinguished from both by its shorter and wider palpi and head, 

 more swollen and shorter antennae and cirri, shorter and more 

 elliptical stomach, and by having crowded brown spots on its dorsal 

 surface, becoming fewer in front of the stomach, and by its large 

 anterior eyes. 



There are also several Mediterranean and Madeira species, as G. 

 fusifera (Quatr.); G. clavata (Clai3.) ; G. doUchopoda Marentz., 

 also recorded from New Jersey by Webster ; G, pusilla (Duj.) ; G. 

 tenuicirrata (Clap.) ; G. limhata (Clap.). By Langerhans the first 

 three of these European sj^ecies ai'e considered identical. 



Eusyllis Malmgren. 



Under this genus there are now included several diverse groups 

 that agree in having the anterior margin of the oesophagus finel}'' 

 denticulated but differ in their setse, cirri, paljii. etc. 



Eusyllis, typical subgenus. 



If we consider as type, the first of the two species of Malmgren 

 [E. JBlomstrandi), in which the antennae and cirri are not moniliform 

 and the non-sexual set£e are mostly compound with bidentate blades, 

 the genus would scarcely differ from Pionosyllis Malmg., of the 

 same date, except in the serrulation of the oesophagus. Pionosyllis 

 was originally separated mainly on account of its capillary setre, now 

 known to be only a sexual character. It may be said to be a Syllis 

 without articulated cirri. 



As it is convenient to have a distinctive name for this particular 

 type, I propose to consider it a subgenus, Eusyllis, differing from the 

 next group in having the aj^pendages imperfectly articulated. Be- 

 sides the compound setae there is an acute simple seta and often a 

 bidentate one in the posterior fascicles. Saccular gular glands are 

 lacking alongside the oesophagus. 



The second species described by Malmgren was E. monilicornis. 

 It has been redescribed b}^ others and is better known than the first 

 species. Its palpi are separate nearly to their bases ; the cirri are 



