GLYCERA LAPIDUM. 477 



in 1898. He divides the structure into three regions — the anterior or pharyngeal, the 

 middle or proboscis (trompe pharyngienne), and the posterior region or ventricula 

 (stomach). From the structure of the teeth this would appear to be G. capitata. The 

 great development of the nervous system of the proboscis is emphasized. 



This author further adds that Glycera has transverse bands of cilia on the segments 

 of body and head. He figures and describes a nuchal organ on each side of the basal 

 cephalic segment. A longitudinal groove occurs on the prostomium ventrally. Gravier 

 concludes that the head of a Polychaate differs fundamentally from a normal metamere. 



Viguier 1 again considers all in front of the mouth as the prostomium. 



In regard to distribution, none were found beyond 470 fathoms in the ' Challenger,' 

 but Ehlers mentions Glycera capitata at 664 fathoms in the ' Porcupine.' Hemipodus has 

 not hitherto occurred in British waters; as a rule it is southern and abounds in the 

 Strait of Magellan ('Challenger'). It is probable that most of the European forms 

 stretch to the American shores, and that further study will simplify the present list of 

 species. 



Genus LXXVI. — Glycera, Savigny, 1820. 



Head acutely conical with eight or more rings. Buccal (peristomial) segment large. 

 Eyes absent or present ; two retractile palpi (Ehlers). Segments with two or three rings. 

 Feet bifid ; a dorsal division with a stumpy dorsal cirrus often above the foot and simple 

 bristles with very narrow serrated wings, and a ventral with compound bristles and a 

 flattened ventral cirrus. Ventral spine considerably longer than the dorsal. Branchiae 

 present or absent. A modified blood-vascular system. Perivisceral corpuscles reddish. 

 Proboscis large, powerful, with four black teeth, the tips of which are strongly hooked 

 and emerge from a follicle with large glands. Muscular layers, nerve-cords, and segmental 

 organs as in the type. 



Kinberg (1865), in his characters of the genus, placed reliance on the structure of 

 the teeth (his maxilla), which he described as having a long and a short lateral process, 

 whilst the " branchiae " were terminal, and stated that with the ventral cirrus there were 

 generally five lobes on the feet. He did not enter into the minute characters of the 

 bristles. Glycera and Hemipodia were his two genera. 



Group I. 

 No branchiae. 



1. Glycera lapidum, De Quatrefages, 1843. Plate LV, fig. 4; Plate LXIV, figs. 9 2 and 

 9 a ; Plate LXXVI, figs. 1-1 b— feet, etc. ; Plate LXXXV, figs. 3-3 b —bristles. 



Specific Characters.— Read a moderately elongated cone of eight segments. Body 

 elongated (3 — 4 ins.), and of 150 — 170 segments, which are three-ringed, the median in 

 spirit-preparations being more elevated than the others. It terminates posteriorly in two 



1 c Annel. Infer. Bay of Algiers/ 



3 This is termed G. capitata in the explanation. 



