JNGI 



. SV. VET. AKADEMIENS 



HANDLINGAR. 



BAND 



63. n:o 7. 



No. 

 1 



Approximate length 

 35 



in mm. 



Number of anal cirri 

 24 



2 



49 







22 



3 



about 75 







22 



4 



75 







29 



5 



< no. 6 







29 



6 



140 X 4* 







24 



7 



= or > the preceding 





30 



8 



175 X 35 1 







29 



31 



The first and thus the smallest specimen has anal cirri almost quite symmetrically 

 arranged; of these nos. 2, 4, 7 and 11 on each side of the ventral cirrus are comparatively 

 long, the others short. In addition there is a very small 25 th cirrus, uncounted above, 

 just under the 3 rd long one on the left side. The 2 nd specimen has alternating long 

 and short cirri except that the 3 rd cirrus to the left of the ventral cirrus is long and the 

 4 th short ; if these two cirri were to change places the symmetry would be complete. 

 Specimen no. 3 has the following cirri long: nos. 3, 5, 7, 10, 12, 15, 17, 19 and 21 

 (the ventral cirrus being no. 1 and the others counted clockwise). Specimen no. 7 is 

 very regular, except for some variations in length in the groups of short and long 

 cirri; on each side the 2 nd , 4 th and 12 th cirri are long; 5 in the middle of the back 

 are all short. Specimen no. 5 has anal cirri not quite symmetrically arranged, but still 

 almost so. The other specimens are somewhat more irregular. 



The tube of the 8 th specimen has an inner diameter of 3 '5 and an outer one of 5*5 

 mm. The anterior end of 3 specimens is regenerated, comprising 3, 3 and 4 setigerous 

 segments respectively. 



Friday Harbour, muddy beach, San Juan Island, Washington, between tide-marks. 

 2 / 7 1911. 7 complete medium-sized specimens, 1 of which has the posterior end regener- 

 ated from the 17 th setigerous segment inclusive. 



Departure Bay, Vancouver Island, British Columbia, 1911, 4 specimens, 2 of which 

 are complete. At least 2 rather large. One well extended specimen, 61 mm. long and 

 about 1 mm. wide, has only 18 anal cirri, alternately short and long, except that nos. 

 1, 2, 4 and 5 on the right side of the ventral cirrus are short. One rather large, loose 

 posterior end with 34 anal cirri is on the whole symmetrical with alternating shorter 

 and longer anal cirri, except that 2 shorter cirri are found on each side of the ventral 

 cirrus and also 3 short ones in the middle of the back. 



Cape Beale, sandy beach, West Coast of Vancouver Island, between tide-marks, 

 3 % 1911. 15 rather small specimens, 11 of which are complete; the eggs observed 

 are immature, of different sizes, the largest 0*28 X 0'3 mm. 2 specimens have the 

 posterior end regenerated behind the 16 th and 18 th setigerous segment respectively. 



Albert Head (near Victoria), Vancouver Island. From this locality there are 6 

 rather large posterior ends, taken by Dr. Cresswell Shearer ( 14 / 7 ). 



1 Maximum thickness. 



