3 I 8 POLYCHAETA 



Fabricius, which occurs less frequently and in deeper water, ;ind 

 is larger than the preceding. Both are Atlantic forms. 



Fam. 8. Amphinomidae. The body in this family is either 

 vermiform, as in Eurythoe, or oval and flattened, as in Euphro- 

 syne and Spinther. The head carries a peculiar sense organ, the 

 " caruncle," consisting of a smooth axis with the sides folded so 

 as to look like a number of lamellae. The parapodia carry gills. 

 Most of the Amphinomids are tropical and Southern forms. 



Eurythoe borealis Oerst. measuring 6 inches, occurs all round 

 the British area, from the Shetlands, where it occurs in deep 

 water, to the Channel Isles, where it lives on shore, under stones, 

 etc. (For parapodium of Amphinome see p. 264.) 



Euphrosyne. The body is short, oval, and flattened. The 

 parapodia are not distinct processes, but the chaetae extend from 

 each side of each segment nearly to the middle dorsal line, 

 and are absent ventrally (Fig. 137, C, p. 265). The dorsal and 

 ventral cirri are more or less filiform, and there is an inter- 

 mediate similar process on the back ( ? = lip of chaetigerous sac). 

 Amongst the chaetae are a number of curious branched processes 



usually called " gills." The presence of these and of the 

 chaetae give the upper surface of the body a fluffy appearance. 

 E.foliosa Aud. and Edw. is fairly common under stones on our 

 southern shores. It is about an inch in length and is of a 

 cinnamon-red colour. 



Fam. 9. Eunicidae. -The elongated body is provided with 

 parapodial gills in more or fewer segments (except in Lumhrico- 

 nereis). The " gills " may be cirriform (Hyalinoecia), pectinate 

 {Eunice, Onuphis), or more complex (Diopatra). The notopo- 

 dium is represented by a lobe (usually called " cirrus ") into 

 which an aciculum projects ; in some cases it even contains a 

 few chaetae ; most of the neuropodial chaetae are jointed (Fig. 

 138, F). The prostomial tentacles vary in number; they may 

 be three or five, or five and two short " frontal palps," or they 

 may be absent. Peristomial cirri are absent, though in Eunice, 

 Diopatra, and Onuphis " nuchal cirri " are present on the dorsal 

 surface of the second segment (Fig. 134, D). One of the most 

 characteristic features in the anatomy of the Eunicids is the 

 peculiar jaw apparatus (see p. 270). The majority of the 

 genera form permanent tubes of parchment - like consistency, 

 1 Buchanan, Quart. J. Micr. Sci. xxxv. 1894, p. 445. 



