4 Hooded hooks appear within first five feet 5 



4' Hooded hooks appear after 8th foot 12 



5 Ail hooded hooks simple 6 



5' Anterior hooded hooks compound, subsequent ones simple 10 



6 Prostomium very long, often pointed. First few feet very small 7 



6' Prostomium broadly conical. First few feet normally developed. 



[Apex of hooded hooks with a crest of several small denti- 

 cles above a larger tooth] 9 



7 Hooded hooks with a crest of small denticles surmounting a 



larger tooth. [Mx. II with three teeth. (L. acuta)] No N.C. record 



7' Hooded hooks with two well-developed teeth 8 



8 Teeth on hooded hooks at right angles. Mx. II with three teeth; 



maxillary supports short and broad L. a/xiTaiis 



8' Teeth on hooded hooks almost parallel. Mx. II with five or six 



teeth; maxillary supports long and slender L. parado.va 



9 Mx. Ill with two teeth. Postsetal lobe of parapodia always 



markedly longer than presetal one L. tctmura 



9' Mx. Ill with one tooth. Postsetal lobe of middle parapodia 



hardly longer than presetal one L. sp. 



10 Mx. II with three teeth; Mx. IV as large white plates with a 



black margin. [Posterior parapodia with subequal lobes] L.albidtniuta 



10' Mx. II with four or five teeth. Mx. IV completely dark 11 



11 Mx. Ill with two adjacent teeth. Postsetal lobe obviously longer 



than presetal in middle and posterior segments L. latrcUli 



11' Mx. Ill as a curved cutting plate with one tooth at the corner. 

 Postsetal and presetal lobes subequal and both short in 

 middle segments, but elongate and slender in far posterior 

 segments L. cmzeiisis 



12 Acicula black. [Simple hooded hooks appear after 20th foot] 13 



12' Acicula i)ale 14 



13 Mx. 1 1 with three teeth ; Mx. 1 1 1 with one tooth. Anterioi- hooded 



hooks with very long blades L. brcvipcs 



13' Mx. II with four or five teeth; Mx. Ill with two teeth. Hooded 



hooks always with short blades L. fraii'dh 



14 Anterior setae include compound spinigerous forms; hooded 



hooks ai)])ear about .setiger 18. first few compound, remain- 

 der simple. Mx. Ill with two indistinct teeth L.juiiuarii 



14' No compound spinigerous setae; hooded hooks always simple 



and appear about 12th-17th foot. Mx. Ill with one tooth L. tenuis 



58 



