EURYTHOE ALCYONIA. 165 



EuryÜwë pacifica Kiub. , described exactly by M'Intosh , 

 is distinguished from the foregoing species by having its 

 stout ventral bristles serrated on the inner margin ; however 

 it seems to me not without doubt that this difference 

 should be sufficient to separate the two species. 



Genus Pherecardia Horst , (n. g.) ^). 



Body long, with numerous rectangular segments, like 

 in Eurythoë. Head-lobe with an unpaired tentacle , two 

 paired tentacular cirri and a pair of palpi ; caruncle extend- 

 ing over three segments , consisting of a median , heart- 

 shaped portion , which bears on each side several folded lobes. 

 A tuft of short , cylindrical , branchial filaments behind the 

 dorsal bristle-papilla of each body-ring. Bristles of the ven- 

 tral fascicle slender, not furcated; bristles of the dorsal 

 fascicle : some capillary , others stouter , smooth or serrated. 



Pherecardia lobata, n. sp. (PL 7, figs. 10 — 14). 



Among the Annelids of the Utrecht Museum I met with 

 a specimen , so strikingly distinguished from the known 

 Amphinome-ST^ecies by the structure of its caruncle and 

 bristles , that 1 thought it necessary to make a new genus 

 for it. On account of the unsufficient state of preserva- 

 tion, especially of the head, I cannot enter into all the 

 characters of the animal as minutely as should be desirable. 



The body measures 92 mm. in length and the number 

 of its segments amounts to 66; but it is imperfect, for 

 it wants some of the posterior rings. The greatest breadth 

 is 9 mm. The body is flattened , marked on its dorsal side 

 with faint longitudinal folds; on the ventral side there 

 is a shallow, median, longitudinal groove. In its ante-- 

 rior half the body has nearly the same breadth, but 

 towards the hinder end it becomes gradually narrower. The 



1) Derived from <pépsiv , to bear and xxpSix , heart. 



Notes frota the Leyden IMuseum , "Vol. VIII, 



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