Gattij Marine Lahoratory ^ St. Andrews. 43 



flattened lanceolate lobes anteriorly^ and behind a shorter 

 conical lobe, whilst a blunt lobe occurs infcriorly. The 

 ventral cirrus is bluntly lanceolate and reaches only to the tin 

 of the truncate lobe just inentioncd. The branchia becomes 

 very distinct at the 20th foot, and it diminishes towards the 

 tip of the tail to a small process at the base of the dorsal 

 lobe. 



Though it is doubtful whether an accurate diagnosis can 

 be made concerning the Glycera unicornis of Saviguy "^^ yet 

 the descriptions of subsequent authors, more especialiy those 

 of Malmgren (his G. Goesif) and Ehlers J (who, however, 

 gives it bifid branchiae in certain instances) , would appear to 

 separate this form. Such brancliitC have not been seen in 

 Britain, and it may yet be necessary to distinguish it from 

 the Glycera Goesi, Malmgren. In Britain it has hitherto 

 been chiefly found in deep water in Shetland, in the Minch 

 and off the south-west of Ireland. The head is typical, the 

 body about 5 or 6 inches in length, and the segments two- 

 ringed. The proboscis has conical papillse interspersed with 

 globular ones. The inner spur of each tooth takes the form 

 of that of G. capitata, viz. a ridge which comes near the 

 surface in position and a long bar below. In all the fano- 

 has a denticle about the point of origin of the inner spur 

 and the base of the tooth is set obliquely in the proboscis so 

 that the distance between the extreme points is considerable. 

 The branchiae commence on the 32nd foot and continue 

 nearly to the posterior end (examples incomplete). The 

 typical foot has considerable depth, with the comparatively 

 large dorsal cirrus at the base. The branchia is on the 

 anterior surface of the foot and is directed forward and 

 slightly upward. Two long lobes occur at the tip of the foot 

 anteriorly and two shorter flattened conical lobes posteriorly, 

 besides a short ventral cirrus with an oblique and rather 

 blunt tip. The Glycera decipiens of Marenzeller §, from the 

 Bay of Miya in Japan, appears to resemble this species very 

 closely both in regard to the position of the branchiae and 

 the structure of the foot ; Arwidsson is of the same opinion. 



No representative of the family Ariciidse is entered in 

 Dr. Johnston's ' Catalogue of the Annelids in the British 

 ^fuseum,' though under this head he gives several examples 

 of the Spionidsc. The work, however, was only published 

 after his death, and omissions probably occurred, for in an 



* Syst. des Aim. p. 37. 

 t Ann. Polych. p. 71, tab. xv. fig. 81. 

 { liorstenw. ii. p. 666, Taf. xxiv. fig. 3o. 

 § Siuljap. Annel. p. 140, Taf. vi. fig. 3. 



