Gatty Marine Lahoratory^ St. Andrews. 39 



lower lobe now far exceeds the superior in bulk^ the broadly 

 lanceolate outline being due to the approximation of the tAvo 

 flaps. The ventral cirrus is proportionally smaller. In the 

 superior division aj^^ain the setigerous lobe forms a short and 

 broad cone with the lanceolate cirrus superiorly. With 

 sliglit modificatious this structure continues to the posterior 

 end. 



Advanced ova occur in specimens from Ireland and Shet- 

 land in July. 



Grube and Elilers have each given classifications of the 

 Glyccridae, the former basing his main groups on the presence 

 or absence of branchise^ the latter using the armature of 

 the proboscis and the nature of the feet to form his chief 

 divisions. Ehlers's first group, the " Glycera tetragnatha/' 

 hoAvever, includes both of Grube's ; the second, the " Glycera 

 polygnatha," comprising Goniada and Glycinde, being treated 

 separately by Grube. Arwidsson "^ retains, after Malmgren, 

 the Glyceridae and Goniadidse as sepai'ate families, and his 

 jjaper, illustrated by outline-figures, forms an important 

 contribution to the subject. 



The teeth in the Glyceridse are arranged in pairs, their 

 disposition, however, being such that they divide the circum- 

 ference of the extruded proboscis inio four nearly equal 

 parts ; the larger space, however, often occurring between 

 the two pairs, not between the individuals composing a pair. 

 The pairs of teeth are recognized by the direction of the 

 spurs, which are symmetrically arranged on each side — spur 

 pointing to spur — whether it is simple as in Glycerella or 

 bifid as in the common Glycera lapidum. The single process, 

 however, appears always to be longer than the bifid, and in 

 either case the spur forms a large angle with the tooth which 

 is obliquely inclined to the process. 



The first and most abundant British form is Glycera 

 lapidum, De Quatrefages, which stretches along both coasts 

 from north to south, is a common European form, and 

 ranges to the South Atlantic. In its epitokous form (like 

 " Glycera setosa ") it is found swimming at the surface of 

 the sea from Shetland to the Channel Islands^ though it is 

 not common in this condition. This species has the body- 

 segment three- ringed, the papillfe of the proboscis are filiform 

 and crenate, and the foot has a single spine in front. At the 

 35th foot, however, the dorsal lobe, instead of being folded 



* " Stutlien iiber d. Fam. Glyceiidee &c.," Bergens Museum Aarbog, 

 1898. 



