648 • A. E. Verrill — Turhellaria, Nemertina, and 



regarded as only a subgenus, with longer antennae, cannot be used 

 for the genus, because it and its variants had been used in at least 

 four or five other senses before it was applied to these annelids. 

 Anisoceras was used by Pictet in 1854; Anisocera was used in 

 Coleoptera, both in 1833 and 1835; Anisocerus was used in Coleop- 

 tera, both in 1835 and in 1837. Prlonognathus, Kef., 1862 {yion 

 LaF., 1851, nee Pand., 1856) is a closely related group, but the type 

 S. ciliata (Kef.) may, perhaps, be a distinct subgenus. 



Another group, perhaps of generic value, is typified by S. ruhro- 

 vittata (D. Ch.) well described and figured by Ehlers (Borstenw., p. 

 424, pi. xviii, figs. 1-16), which was the type of Staurocephalus Gr. 

 It has a prominent, long, pyriform head with large, flat, recurved, 

 frontal palpi; much shorter articulated antennae ; 4 eyes ; a conspic- 

 uous ciliated lobe on each side of the neck ; a terminal article on the 

 dorsal cirri ; stout nearly parallel lower jaws, ending abruptly ante- 

 riorl}^, and with acute, mostly strongly dentate plates in two or three 

 series forming the upper jaws. For this group, I would propose the 

 subgeneric name Teleonereis. 



If it be thought necessary to change the name of the family owing 

 to the change in the principal genus, I would propose to adopt 

 Stcmronereidce, as it is analogous to LumhrinereAdm. 



The following three Bermuda species belong to the group called 

 Atiisoceras by Ehlers, for they have long articulated antennfe. The 

 same is true of Stcmronereis 2yallidus (V. 1873), of the New England 

 coast; S. sociabilis (W. 1878) of Virginia; S. coecus (W. 1884), 

 of New England ; and several European species, including Stauro- 

 nereis Jiudolj^hii (D. Ch.) so well described by Ehlers, and S. Chiajei 

 (Clap.) of the Mediterranean ; S. rubra (Gr.) St. Croix ; S. vittata 

 (Gr.) aud -8. Moculata (Gr.) from the west coast of Costa Rica. 



S. (Stauroceps) eruclformis (Malmgren). This Arctic species may 

 be the type of a special subgenus, Stauroceps. It has a small head 

 with very short non-articulated antennae and smooth dorsal cirri, 

 without a terminal article. Its jaws, as figured, also appear to be 

 more simple than those of most of the other described species. 

 S. minimus (Langerh., 1884) of Madeira has even less developed 

 antennae and cirri, though it must be immature. Perhaps it belongs 

 rather to ParacUus. 



Stauronereis melanops, sp. iiov. 



Head rounded in front and behind, with the sides a little promi- 

 nent, about as long as broad ; a pair of divergent, narrow-lanceolate 

 ridges arises from the middle of the posterior margin. 



