42 Prof. M'IntosL's Notes from the 



This differs from any other British form in the structure 

 of the foot and in the j^i-catly elongated snout. 



The cephalic cone is much elongated and shows about 

 twenty-two rings with the tentacles at the tip. Tlie papillse 

 of the proboscis are elongate and conical, whilst here and 

 there are a few with broader tips, so as to be somewhat 

 lanceolate. The teeth present only a single spur of con- 

 siderable length with a shoulder or flange at the base. 



The segments of the body, where most distinct, appear to 

 be three-ringed. 



The typical foot has a comparatively large rounded dorsal 

 cirrus with a broad base, two elongated conical lobes ante- 

 riorly, and a single median lobe of considerable size — with 

 a rounded edge posteriorly. The ventral cirrus is conical 

 and extends beyond the tip of the latter. 



This characteristic form has been in the meantime "asso- 

 ciated with a species described by Elders as Glycera lopidam '^, 

 but which differs from that which has a better title to the name, 

 and therefore Arwidsson has termed it Glycera Ehlersi f- 

 It is true it differs from the species described by Ehlers in 

 liaving apparently three rings to each segment, but in small 

 specimens it is often difficult to apply this character. The 

 structure of the foot of the two forms is tlie same, though 

 Ehlers has given no figure. Both have a single spur to the 

 teeth — with a flange at its base — and the papilhc of the 

 proboscis are similar. Ehlers considered that the Glycera 

 capitata of Keferstein | was his form, but I agree with 

 Arwidsson in referring Keferstein's form to Glycera lapidiim. 



Amongst those with branchiae is the almost cosmopolitan 

 Glycera alba, H. Bathke, which ranges from Britain to 

 Japan and is equally at home in the west of Shetland as on 

 the shoi'es of Devon and Cornwall. The body is of consider- 

 able length (G-8 inches) and the segments ai-e two-ringed. 

 The proboscis is short and clavate and the papillae small and 

 clavate. The teeth have a long external and a shorter 

 internal spur, both arising from a broad base. The foot is 

 somewhat short anteriorly, longer posteriorly. Branchiae 

 are present on all the feet except the first and the last (about 

 twelve at each end) and arise from the dorsal edge of the 

 foot towards the tip. The dorsal cirrus is short, w ith a con- 

 striction at the base. The foot soou shows two spines, two 



* Borstenw. ii. p. G52. 



t Op. cit. p. 19. 



X Zeit. f. w. Zool. Bel. xii. p. 105, Taf. ix. figs. 17-27 (1862). 



