Prof. Grube on the Annelid Family Maldaniea. 395 



spaihulata, Gr., is probably described from two extremities 

 not belonging to the same species, and therefore to be removed 

 provisionally from the system ; and 0. microcephala^ Schm., 

 seems, from the figure, to be engaged in the reproduction of 

 the anterior extremity ; for the first segment in the figure bears 

 bristles, and is therefore not the buccal segment, and the pro- 

 cess in front of it by no means resembles the cephalic lobe of 

 other Maldaniea. 



For the purpose of a general revision of the arrangement of 

 the genera, the structure of the cephalic and caudal extremi- 

 ties seems to the author to be particularly fitted ; and he thinks 

 that this arrangement may be most conveniently given in the 

 following manner : — 



1. The terminal segment is funnel-shaped, with the anus in 

 the middle of the bottom of the funnel. 

 a. In nearly all the forms belonging here the margin of 

 the funnel runs out into points or teeth, as in the genus 



Clymene^ Sav., which Malmgren divides into the genera 

 Wiodine^ Nicomache^ Axiothea^ and Praxilla^ according as the 

 vertical plate is dilated or not into a free margin, and according 

 to the number of the segments, whether bearing or wanting 

 bristles. Grube would unite under Clymene all the forms 

 which have a margined vertical plate, and would therefore refer 

 to it the Axiothece and Praxillce^ and transfer Nicomache to 

 Leiocephalus. Of Rhodine the terminal segment is still un- 

 known. The genus Clymene does not occur at all amongst the 

 northern ones exclusively described by Malmgren; Kinberg 

 limits it to G. amphistoma^ Sav., and gives as its character, 

 according to Savigny, twenty-five (probably twenty-eight) seg- 

 ments, and states that the three anteanal segments bear uncini, 

 but the three segments following the buccal segment only 

 setae. But Savigny only indicates twenty-eight segments as 

 not observed with certainty; and the specimens which the 

 author found marked with this name in Ehrenberg's collection 

 from the Red Sea are only in fragments (long cephalic and 

 caudal ends), and therefore leave us in the dark upon this 

 point, although they agree with Savigny's description so far 

 that they may be regarded as identical ; they show no uncini, 

 however, upon the anteanal segments ; whilst on the three 

 anterior segments referred to, a small spine exists beneath the 

 setas which may easily have escaped Savigny ; his figm'e at 

 least shows the pit from which it issues. 



If we laid as great a weight as Malmgren upon the number 

 of the segments, a new question would arise, namely, whether 

 it is requisite to consider only the total number of segments, 



28* 



