Gaily Marine Laboratory^ St. Andrews. 41 



that lie refers to the common British species (G. lapidum) 

 hitherto termed Ghjcera cap'ituta, a species in Avhich the seg- 

 ments are tluee-riuged. The G. cajntata of Keferstein is 

 described by the author as two-ringed, so that Q^^hlers and 

 Arwidsson must have satisfied tliemselves that this is amis- 

 apprehension before grouping it with the British form, which 

 is three-ringed. 



It is sckh)m that two forms so closely approach each 

 other as Ghjcera capitnta, CErst., and Ghjcera lapidum, 

 De Quatrefages, for the differences in the comparative length 

 of the foot in spirit-preparations are not noteworthy, and 

 the other characters require minute investigation. G. capi- 

 tata, however, is a purely northern form, characteristic of 

 the waters of Greenland, and not passing farther south than 

 the North Atlantic according to Arwidsson, whilst G. lajJi- 

 dum ranges far southwards. The latter is distinguished 

 from G. capitata by having an eleven-ringed cephalic region, 

 pointed foot-lobes, first three feet small and devoid of a 

 dorsal cirrus, ventral cirrus pointed, and dorsal cirrus larger. 

 The papillae of the proboscis are long and subulate, situated 

 on eighteen longitudinal muscular areas, between which are 

 short ovoid papillae. The spur of the teeth forms a wide V, 

 whereas in Ghjcera capitata, CErst., there is but one limb 

 and a truncated surface (Arwidsson, chieffy). How far 

 future observations may indicate a closer relationship between 

 the two forms is an open question. The differences in struc- 

 ture and distribution are, meanwhile, noteworthy. 



Another abundant species is Glycera siphonostoma, Delle 

 Cliiaje (G. tessellata, Grube), which has an extensive range 

 from the north of Scotland to the Cape. In this large form 

 the segments are two-ringed and the massive proboscis has 

 lanceolate papillae each streaked like a leaf. The foot is 

 comparatively short, with an ovoid dorsal cirrus on the body 

 at the base, two long, anterior, broadly lanceolate lobes, 

 about equal in length, and two short, blunt, posterior lobes 

 besides the ventral cirrus, which is of considerable length, 

 though it does not extend so far outward as the anterior 

 lobes. The spur of the teeth in the proboscis resembles that 

 of Ghjcera cajntata, G^rst., in having a single process and a 

 flat edge at its base. The body is upwards of a foot in length 

 and nearly half an inch in diameter. 



Glycera Ehlersi, Arwidsson ? 



A species from 80 fathoms in St. Magnus Bay, 1867; 9 

 miles off Balta, in 80 fathoms, in 1868; and in 53 fathoms 

 on 3rd and 4th August, 1 880, in the ' Knight Errant.' 



