DR. BAIRD ON THE AMPHINOMACEA.. 215 



Contributions towards a Monograph of the Species of Annelides 

 belonging to the Amphinomacea, with a List of the known 

 Species, and a Description of several new Species (belonging to 

 the group) contained in the National Collection of the British 

 Museum. To which is appended a short Account of two hitherto 

 nondescript Annulose Animals of a larval character. By W. 

 Baibd, M.D., P.E.S., &c. &c. 



(PhKTv.a IV., v., Vl.) 



[Eead April 2, 18G8.] 



In the preceding volumes of the ' Journal of the Linnean Society,' 

 Vol. VIII. pp. 172-202, and Vol. IX. pp. 31-38, I have communi- 

 cated two papers to the Linnean Society, entitled " Contributions 

 towards a Monograph of the Aphroditacea.'' In most of the systems 

 of arrangement of the Annelides, the species of the group AmpJii- 

 nomacea succeed those of the AphrodUacca ; and I now propose 

 following up those papers by some contributions towards a further 

 knowledge of the species of Amphinomacca also. 



The few species known to Pallas and Grraelin were all arranged 

 in the genera ApJirodita and Terebella. Bruguiere first separated 

 them from Aplrodita, and formed a distinct genus to receive them, 

 to which he gave the name AmpUnome. These worms difier much 

 from the Aphrodifacea, by the want of those organs called elt/tra, 

 and by the presence of an uninterrupted series of branchiae, which 

 occur on almost all the segments of the body, and which do not 

 alternate, as in these latter, with cirri. Many of them are very 

 long and present a play of fine iridescent colours ; most of them 

 are natives of tropical seas. Since the genus Ampldnome was 

 formed by Bruguiere, great additions have been made, several 

 new genera and even distinct families have been formed ; and as 

 our knowledge of the various species which form this group in- 

 creases, it will no doubt be found necessary to form several more. 



aroup AMPHINOMACEA. 



Amphiuomeaceae, Johnston. 

 Ampliinomea, Kinberg, Cams. 



Family I. AMPHINOMID.^. 



Amphinomea, Blainville, Grube, Schmarda, Cams, Fillers, Quairefages. 

 Ami)hiiionia;a, LnlreiUe. 



15* 



