2l8 BUSH 



occur in the middle of the fascicle, which also have long slender 

 capillary tips ; these apparently become worn off, as the simple spear 

 is often seen, and they often have more color than the other setae. The 

 hooked setae are difficult to find, probably because easily broken, but 

 have been seen on all but the first segment, never more than two together. 



On the abdomen the setae are spear-shaped, with long terminal fila- 

 mentous ends. The uncial plates have a long slender primary tooth 

 and a shorter closely appressed secondary one. They form a nearly 

 complete circle around the body, passing posterior to the fascicles of 

 setae, interrupted only by a narrow ventral area. 



Length of one of the largest specimens 120 mm. ; breadth at base of 

 thorax 7 mm., at first segment 5 mm. ; length of branchiae about 17 

 mm. A much more contracted specimen of 85 segments is about 55 

 mm. in length, 9 mm. in breadth at base of thorax, and 4.5 mm. at 

 first segment, with the branchiae 14 mm. in length. The smallest speci- 

 men, of about 50 segments and 10 pairs of branchiae, is 15 mm. long, 

 besides 7 mm., the length of the branchiae. 



Virgin Bay, Prince William Sound, June 27, sixteen specimens em- 

 bedded in thick jelly. 



MYXICOLA AFFINIS sp. nov. 

 pi. xxxvin, figs. 17-20. 



Type locality. Pacific Grove, California. 



A specimen filled with eggs, of a decided yellow color, with a 

 greenish tinge to the branchiae, especially the very long pinnae, has 

 8 thoracic and 50 abdominal segments and 20 pairs of branchiae with 

 comparatively long, free, slender tapered tips. 



It is very like specimens of Myxicola steenstrupi Kroyer (see pi. 

 xxxvni, figs. 13-16, 21, 22, 24) from the Bay of Fundy, but has the 

 limbate setae much broader, and the hooked thoracic setae (numbering 

 14 on the last segment) stouter and much less curved. 



Length 4.5 mm. ; greatest breadth of thorax 5.5 mm., of first seg- 

 ment 4.5 mm. ; length of branchiae 12 mm., of free end 3 mm. 



Myxicola pacifica Johnson (1901) is a larger species, with 9 tho- 

 racic segments and 14 pairs of very long (21 mm.) branchiae. 



MYXICOLA GLACIALIS sp. nov. 

 pi. xxii, fig. i ; pi. xxv, figs, i, 2; pi. xxvi, fig. 4, b\ pi. xxxvin, 



figs. 12, 23, 25-32. 



Type locality. Dutch Harbor, Unalaska Island. 

 This is a slender species, with the body of the usual cream color, the 

 thoracic region and branchiae colored with deep purple having a tinge 



