40 Prof. M'Intosli's Notes from the 



backwards, projects straight outward, and dorsal bristles are 

 present, though the second spine oul}^ appears about the 

 45th foot. The typical foot presents three pointed lobes and 

 a small dorsal cirrus above it, the third or inferior being the 

 conical ventral cirrus, the hind lip being broad and rounded. 

 The ventral bristles are in two fan-like groups, the extreme 

 dorsal and ventral bristles being stronger than the central in 

 the posterior region of the body. This important feature 

 seems to have escaped the patient and persevering labours of 

 Arwidsson, though it is also slightly indicated in G. capi- 

 tata, Cb^rst. In the epitokous condition the body is longer, 

 the feet longer and more prominent, and the spines and 

 bristles longer and more attenuate. Moreover, simple 

 bristles occur amongst the compound in the ventral series. 

 In contrasting this form with the northern Glycera cajntata 

 in its epitokous condition the greater length and slenderness 

 of the bristles is apparent, as well as the less pronounced 

 increase in the thickness of the upper and lower groups of 

 the strong compound bristles. 



It was Glycera lapidutn w^ich was dredged in the ' Chal- 

 lenger'^ off Fayal in the A:;ores, not G. capitata, and it was 

 the latter species (as the original labelling of the slides as 

 well as the remarks of Ehlers now indicate) which was pro- 

 cured at Kerguelen, but such differed from the ordinary type 

 in the great length of the tips of the compound bristles and 

 in the stoutness of the shafts of the upper and lower series 

 of the same bristles, a feature approaching the condition in 

 G. lajndum. The differences in transverse section between 

 the ordinary foim {G. lapidum) and the Kerguelen type, 

 especially in regard to the nerve-cords, were described in the 

 ' Challenger ' volume. 



De Quatrefages first applied the term Glycera lapidum to 

 the species described by Dr. G. Johnston as Glycera alba, 

 O. r. M.f, and with it he associated Keferstcin's Glycera 

 capitata, ffii'st. In his description of the species, however, 

 there is little that is definite, for he does not mention whether 

 the segments are two- or three-ringed, though he states that 

 the body is attenuate at both extremities, is devoid of 

 branchise, that the head has 8-9 rings and is very elongate, 

 the feet are short, biramose, have 2 or 3 groups of bristles, 

 and that the superior cirrus is very small, whilst the ventral 

 is large and conical. A perusal of Dr. Johnston^s description 

 and an examination of specimens in the British Museum show 



* Annelids of the ' Challenger,' p. 344. 



t Ann. & Ma--. Nat. Hibt. ser. 1, vol. xv. p. 147, pi. ix. figs. 1-10. 



