346 EUNICID^E. 



Under the sixth division are Nematonereis, Schmarda, with dorsal cirri, and Blainmllea, 

 De Quatrefages, without them. 



In the second series of this group both halves of the jaws have an equal number of 

 pieces; no true cephalic tentacles {E. labidog natha nuclei). It comprises Ninoe, Kinberg, 

 with branchiae, and Luvibriconerei.% Blainville, without them. 



In the second great group (the Eunicea prionognatha) he makes two divisions, viz., 

 first, the E. prionognatJta monocopa, in which the feet are single and the bristles simple. 

 In the first section the dorsal cirri are stunted or absent ; the first pair of teeth with 

 pincer-shaped hooks at the tip and alike. Aracoda, Schmarda, has five pairs of teeth, 

 whilst in Arabella, Grube, the first pair of teeth are unlike. In these all the teeth are 

 similar. In the group following the first pair of teeth is devoid of pincer-shaped ends. In 

 this he places Notocirrus, Schmarda, with stunted dorsal cirri. In the second division the 

 pinnse are bifid, with simple and compound bristles, and under this is Stawocephahis, Grube. 

 Claparede, in his 'Supplement' (1870), takes up the subject of the teeth of the 

 Eunicidas, and compares his nomenclature with that of Ehlers. 



Ehlers : Claparede : 



Trager . . . Support (most posterior piece). 



Zange . . . Pince. 



Zahn .... Deut, or piece dentaire. 

 Sageplatten . . . Plaques en scie 



or or 



Reibplatten . . . Plaques en rape (Claparede would 



call latter paragnathes). 

 Maxillaire inferieure (for lower 

 jaw). 

 He is of opinion that while he may have minimized their importance, Ehlers has exagge- 

 rated it — in classification. He thinks that Ehlers' Labidognathes and Prionognathes pass 

 gradually into each other. Whilst the jaws may be utilized in a certain measure for tribes, 

 their employment is difficult in constituting genera, for the same form of jaw occurs in 

 different genera. The importance of the shape of each piece is less than Ehlers supposes. 

 Claparede found great variations in the jaws of the same species. He further observes that 

 the group (Eunicea) has large tubular fibres on the dorsal surface of the nerve-area. 



At a later period Grube, in his ' Philippine Annelids,' describes the Eunicea (and he 

 includes Staurocephalus) as having a subtriangular or semi-oval head, with lobate palpi (his 

 subtentacles) more or less united, rarely lateral tentacles or none. Tentacles subulate 

 or elongate posteriorly, sometimes none. Eyes two or four or absent. Body long, 

 vermiform, often slender, sometimes rounded, iridescent, with numerous short segments, 

 ending in two or four anal cirri. Buccal segment biannular, two tentacular cirri or none. 

 Proboscis with paired or unpaired horny or calcareous plates. One superior maxilla with 

 hooked tips on each side, simple or toothed ; inferior laminae hooked anteriorly, toothed, 

 truncate or convex. Branchiae simple styles or pectiniform or subfascicular, occasion- 

 ally spiral, springing from the dorsal cirrus, or absent. Feet simple, dorsal and ventral 

 cirri, one spine or more ; one or two fascicles of bristles, often without cirri, but with a 

 setigerous lobe. Bristles simple, or along with compound bristles ; sometimes slender, 



