508 REPORT ON ZOOLOGY, MDCCCXLIV. 



sum ; tentacula et oculi nulli. In this genus Rathke has 

 described the three species, Amm. auloyaster, Hmacina, and 

 cestroides, but afterwards found (Archiv, 1844, Bd. i, p. 

 259) that the latter species coincided with Ophelia mamiUata 

 Oerst. To the genus Siphonostoma he has added four new 

 species : S. plumosum : corpore attenuate ; cute verrucosa ; 

 superioribus setarum fasciculis inferiores longitudirie raulto 

 superantibus ; cirris octo cylhidraccis rnagnis ; tentaculis 

 paulo latioribus. S. vaginiferum : corpore attenuate ; cute 

 subrugosa ; setarum fasciculis cute tanquam vagina abductis ; 

 cirris numerosis, parvis, in duos fasciculos collatis tenta- 

 culis multo latioribus et longioribus. S. iiillosum : corpore 

 breviori ; cute ubique villosa ; setis inferioribus crassis, 

 brevibus, superioribus multo tenuioribus et longioribus ; 

 cirris numerosis, parvis, in duos fasciculos digestis ; ten- 

 taculis multo latioribus. S. inhabile : corpore toroso dolii- 

 formi ; cute verrucosa ; cirris 6 (8 ?) parvis ; tentaculis paulo 

 latioribus. Lastly, Rathke has instituted as a new genus, 

 between Sabella and Clymene, that of Clymeneis, with the 

 species, CL stiymosa, which differs from Sabella in the wane 

 of branchiae on the head, and from Clymene in the narrow 

 and slender posterior production of the body, which, conse- 

 quently, is not furnished with any infundibuliform appendage. 



According to the observations of H. Koch and Will 

 (Archiv, 1844, Bd. i, p. 331) Ch&topterus pergamentaccus 

 occurs also in the Adriatic Sea. Peach (Institut. 1844, 

 p. 419) thinks he has observed, that the Nereis tubicola is 

 able to swim about on the surface of the sea; but this is 

 declared by Forbes to be merely accidental. 



A new and extremely remarkable Annelid, having the 

 aspect of a young SyUis, has been discovered by Quatrefages 

 on the coast of Brittany, and been nsaaied.hyardinia. (Comptes 

 rendus, 1844, p. 77 ; or Ann. d. Sc. Nat. t. i, 1844, p. 19.) 

 It has, on each side of the body 5 a row of motory organs, 

 which recall in every respect the rowing organs of the Rota- 

 toria ; its rudimentary feet, as in the other Branchiata, 

 support stiff setae. 



