Annelida of the Bermudas. 633 



Hemarks on certain c/enera of Syllidce. 

 Amblyosyllis Grube non Langerhans. 



The genus Amblyosyllis Grube (Vidensk. Meddel. Naturhis. For., 

 Kjobenhavn, 1857, p. 186) seems to have been misunderstood by- 

 later writers. It seems to be widely different from the genus of 

 that name as defined by Langerhans and adopted by others. 



As originally established it included only A. rhomheata from St. 

 Croix. It was said to agree with Syllis as to its body, parapodia, 

 cirri, and setae, but the cephalic lobe is coalescent with the buccal 

 segment, and palpi are wanting. "Tentacles 3, tentacular cirri 2, 

 eyes 2." Under the specific description these characters are re- 

 afiirmed. The tentacular cirri are again said to be 2 "(utrinque 1)." 

 The setae are numerous, compound, with long linear blades. The 

 body-segments are few (14). The two eyes are large, oval. The 

 tentacles (antennaj) and cirri are long and imperfectly articulated or 

 " crenulated." 



It is, perhaps, the sexual zooid of some better known genus, biit 

 the single pair of tentacular cirri and eyes, and the absence of dis- 

 tinct palpi are characters entirely at variance with the genus 

 Amblyosyllis of Langerhans, unless it be arbitrarily assumed that it 

 Avas very badly described. 



The latter is made nearly equivalent to Pterosyllis Clap, and nine 

 species were referred to it, besides Grube's type. As defined, it 

 scarcely differs from Trypanosyllis., except in having a long, folded 

 oesopbagus. But it has two pairs or three pairs of eyes ; two pairs 

 of tentacular cirri ; a distinct buccal segment; and two free, separate 

 palpi, which are usually small and bent down under the head. 



To this genus of Langerhans belongs the elegant New England 

 species, Pterosyllis cincinnata Ver. (1874, p. 394, and 1881, p. 308). 

 The latter has rather small, but distinct, palpi ; six eyes ; and very 

 long moniliform cirri. 



Until the original species of Grube can be reexamined, it would 

 appear to be far better to retain Pterosyllis for the northern genus, 

 for it is probable that there are still numerous unknown generic 

 types of annelids in the West Indies, 



Q-rubeosyllis V., nom. nov. = Grubea Quatr. 



The name Girubea Quatr,, 1865, was preoccupied by Grubea Dies- 

 ing, 1858, a genus of trematode worms. Therefore I propose to sub- 

 stitute for it Grubeosyllis. (See the analytical table, p, 632, for the 

 generic characters,) 



