GLYCERINE. 475 



De Quatrefages (1865) described a dorsal and a ventral-blood vessel accompanying 

 the intestine in the Glyceridae, though he also noted that the reddish fluid accumulated in 

 irregular places, and that in some the circulation was diffuse. He distinguished the 

 genera by the uniramous or biramous feet, and their nature. 



Ehlers (1868) divides the Glyceridse into two great groups, according to the 

 structure of the feet. In the first the foot has two anterior but only a single posterior 

 lobe, and under this section fall two forms, viz., Glycera capitata and the British Glycera 

 lapidum, De Quatrefages. The other British forms are included under the second 

 division, viz., those in which two anterior and two posterior lobes are present. This 

 division has three sections. In the first the anterior lobes are long, whilst the posterior 

 are either truncated or rounded or very slightly pointed. Of those devoid of branchiae is 

 a British representative, viz., Glycera siphonostoma. In the second section in which the 

 two anterior lobes of the foot are long, whilst one of the posterior lobes is longer than the 

 other and with simple branchia?, is the well-known Glycera alba, H. Bathke. In the third 

 section, comprising forms in which the anterior lobes of the foot are long and the two 

 posterior somewhat long, and with simple dorsal branchia3, is G. albican*, De Quatre- 

 fages. 



Ehlers unites Goniada with Glycera, and there is much to be said in favour of this 

 view, and comparatively little against it. He groups the Glyceridaa thus : 



A. Proboscis with four hook-like jaws issuing from glandular sacs. Foot in all the 

 segments well formed (uniform) : — Glycera tetragnatha. 



1. Foot simple (of one division) with only a single spine and a bundle of jointed 



bristles. 

 Hemipodus, De Quatrefages. 



2. Foot with two divisions, two groups of bristles, and two spines. 



Glycera (Sav.). 



B. Proboscis with several irregularly formed teeth, without glandular sacs. Anterior 

 and posterior feet unlike (ungleich) : — Glycera polygnatha. 



Goniada and Bone. 



Claparede (1868) observes that the perivisceral cavity in Glycera is divided into two 

 by muscular floors. In the majority of the Annelida Errantia it is divided into three 

 longitudinal chambers. He was of opinion that this family (Glyceriens, Grube) may best 

 be divided into two genera, the one Glycera, like Savigny's original species G. unicornis, 

 being devoid of teeth, the other, Ehynchobolus, having them. 



The blood- system is reduced, but Wiren found blood-vessels in Glycera alba, and 

 Arwidsson 1 in this, in G. Goesi, G. siphonostoma, and G. capitata. 



Ray Lankester again met with hasmoglobin in the perivisceral corpuscles of Glycera 

 (species not stated) at Naples. 2 This subject has been investigated by Cuenot/ Goodrich, 4 

 and Kollmann. 5 Goodrich found leucocytes and granular cells besides the corpuscles 



1 ' Bih. k. Sv. Vet.-Akad. Handl./ Bd. xxiii, 1897. 



2 ' Proc. Roy. Soc./ No. 140, 1873, p. 3 (sep. copy). 



3 < Arch. Zool. exper./ 2 e ser., t. v, Suppl. 2, 1873. 



4 ' Quart. Journ. Micr. Sc./ vol. 43. 



5 'Ann. Sc. nat./ 9 e ser., t. viii, p. 147. 



