35G DE. BAIRD ON SEVERAL GENERA OF EUNICEA. 



Anterior feet with the fascicle of bristles all simple, lanceolate, 

 some, however, nearly double the length of the others ; and in 

 these feet no forcipate uncini, nor pectinate setae, nor acicula) are 

 to be seen. In the feet, however, of the upper third of the body 

 the pectinate setae and the forcipate uncini make their appearance, 

 the pectinate seta; with the head straight, and all the teeth or pec- 

 tinations on the same plane, the forcipate uncini as in Nothria 

 and OnupMs, while the simple seta> become more broadly lanceo- 

 late and limbate. The branchia) on this part of the body consist 

 of numerous branchlets or filaments, two stout branches at first 

 being given off, which very shortly divide again into others, which 

 again divide till there are about twenty filaments or branchlets. 

 The main stems of these branchiae are beautifully edged with 

 blunt, round-pointed cirri ; and all the branchlets or filaments ap- 

 pear as if beaded on their margins. The posterior feet retain the 

 pectinate setae and uncini ; but the branchiae are reduced (as in the 

 first two or three feet) to two simple filaments. 



Rah. Madras, F. Bay, Esq. 



Grenus IV. Nothria, Johnston (s. str. Malmgren). 



Branchiae bipartite. Tentacular cirri placed on the dorsal part of 

 the buccal segment. Tentacle, antennae, and palpi simple, not 

 aunulatcd on any portion of their length. 



Sp. 1. NoTnRIA CONCHTLEGA. 



Onuphis concliylega, Sars, Beskr. og Jaktt. p. 61, tab. 10. f. 2S a-c. 



Onuphis Eschrichti, CErsted. Groenl. Ann. Dors. 20, tab. 3. f. 33-41 

 &45. 



Diopatra Eschrichti, Grube, Fam. Ann. 43 ; Quatrefages. 



Northia concliylega, Johnston, Cat. Non.-Parasit. Worms, 138. 



Nothria *concliylega, Malmgren, Ann. Folycli. Spetsberg. 6G. 



Hah. Coralline region, British coast, Berwick Bay {Dr. John- 

 ston) ; Shetland Islands {J. Gwyn Jeffreys) ; South Devon {J. 

 Granch) ; North Seas {Malmgren). 



Grenus V. Htalin(ecia, Malmgren, Ann. Polych. Spetsberg. 67. 

 Northia, Johnston, Cat. Brit. Worms. 

 Branchia) reduced to one simple branchial filament. No ten- 



* For some critical remarks on the genus Nothria, see at the end of genus 

 Hyalinoicia following. 



