18 IVAR ARWIDSSON, SYSTEMATIC KÖTES ON SOME MALDANIDS. 



ments rather few setae were observed; on the following segments they increase con- 

 siderably in number. 



Of the altogether distinct borders of the posterior capillary setae one is rather 

 narrow, with an increase in breadth to about the 5 th setigerous segment, afterwards 

 narrowing again from about the 7 th ; this börder is rather variable in different setae and 

 even, for instance on the 9 th setigerous segment, the börder may be comparatively broad. 

 The other börder is considerably wider on the lst_7th_gth setigerous segments, after- 

 wards narrowing. 



An otherwise normal specimen from Millport lacks capillary setae on the 19 th 

 setigerous segment. 



Size. The anterior part up to and including the 9 th setigerous segment of one 

 of the largest specimens measures 58 mm. in length with a maximum width of 2*3 mm. 



Tubes. The tubes are rather thick, built of fine, light-ruddy grains of sand; in 

 addition a number of exceedingly fine black granules. The tube of a large specimen 

 shows the following dimensions: outer diameter 4*3, inner 2*3 mm. 



Notices of finds. Firth of Clyde: Millport, Great Cumbrae, sandy shore. 

 4 spec, fairly small. July 1910. — Great Cumbrae, about 22, partly large, spec. July 

 1910. — Balloch Sands, several spec, some large. Sept. 1912. — Between L. Cumbrae 

 and Millport, mud, 2 small spec. Sept. 12, 1912. 



Parasites. One of the last-mentioned specimens has on the l sfc setigerous seg- 

 ment a specimen of Loxosma sp. 



Regeneration. The anterior end in front of the l st setigerous segment regen- 

 erated: 1 spec. 1 anterior setigerous segment regenerated: 4 spec; in one spec. 9 poste- 

 rior setigerous segments were at the same time regenerated. 



2 anterior setigerous segments: 



1 spec 



8 » » » 



1 » 



1 posterior » » 



1 » 



5 » » » 



1 » 



9 » » » 



3 » 



one of which shows a stage in which only the 

 ventral anal cirrus is re-developed. 



Leiochone leiopygos (Grube). 



(Pl. 1. figs. 14—19.) 



1860. Leiochone leiopygos (Grube) (3, p. 91 and 8, p. 96). 

 1894. Leiochone clypeata St. Joseph (16, p. 139). 



Mc Intosh's descriptions of L. ebiensis (Aud. et Edw.) 1892 (15) and 1915 (31) refer 

 to the same species. See also p. 10 above. 



Specific diagnosis. The cephalic plate greatly reduced; the comparatively 

 low borders situated close to the keel and extending backwards as far as the keel. There 

 are ocelli mainly in a large extended group on each side of the cephalic lobe, beneath 

 the foremost part of the borders, a few upon the borders and immediately in front of 

 them; the lower side of the cephalic lobe has ocelli only furthest out on the sides. The 



