182 Mr. W. Small on Annelida rohjchceta 



The head-parts are unfortunately incomplete. The rela- 

 tion between the length and breadth of the head in the 

 present specimen corresponds to Malmgren's drawing. The 

 eyes are large; the anterior pair are placed well back on the 

 head and close to its lateral edge^ and are larger than the 

 posterior pair, which are placed laterally in front of the 

 nuchal border of the head. The tentacles are wanting. 

 Tlidel (1879, p. 23) has completed the descriptions of Malm- 

 gren and Sars (1873, p. 4) by describing the median tentacle. 

 Tlie one tentacular cirrus and the palps agree entirely with 

 the published descriptions. 



No scales and no dorsal cirri are present. The tubercle 

 which, according to Malmgren, takes the place of the dorsal 

 cirrus on the segments which do not bear scales is not 

 apparent. The ventral cirrus is sparingly supplied with 

 short clavate cilia. 



Ditlevson, whose material consisted of a fragment of 9 

 segments, bases the identification of his specimen on the 

 appearance of the bristles, and remarks that his examination 

 of the bristles shows them to agree exactly with the descrip- 

 tion and figures of Malmgren. 



The spines on the dorsal bristles of the present example 

 are more prominent than shown by Malmgren's drawing, 

 and the dor&al bristles themselves, especially the superior, are 

 more curved. Malmgren^s artist likewise has not given 

 sufficient prominence to the spines of the superior and infe- 

 rior ventral bristles, nor does the drawing of the inferior 

 ventral bristle show that the spines increase in length and 

 prominence towards the apex of the bristle. 



The dorsal bristles (twelfth foot) are gracefully curved 

 (PI. VI. fig. 3) ; the spines become larger towards the tip 

 and attain tiieir maximum size a short distance from it. The 

 transverse rows of spines almost pass across the complete 

 breadth of the bristle, recalling the condition in Evanie 

 impar. Indeed, the dorsal bristle of Eucranta villosa closely 

 resembles tiiat of Evarne impar but for the tip, which in 

 Eucranta is rounded and blunt. The bristles are covered 

 with a brown granular mass. The inferior dorsal setae are 

 more curved and slender and have longer spines than the 

 superior. 



The bifid condition of the tip of the superior ventral bristle 

 (fig. 4) is not comiuon ; it occurs in Eupolynoe occidentalism 

 M'lntosh, and in Eupolynoe anticostieiisis, MTntosh, both of 

 which are Canadian forms. The bristle itself is slender and 

 tapers gracefully. The lateral spines are large and slightly 

 recurved and are almost equalled in length by the transverse 



