324 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 15 



from the fifth setigerous segment and number 15 pairs; they are simple, 

 Ungulate, moderately large and directed over the dorsum. Abdominal 

 segments are moniliform and broader than long, with the greatest dia- 

 meter near the middle where the acicular spines project from the sides 

 of the body. The notopodial postsetal lobe is a short digitate process 

 (fig. 4) and greatly surpassed in length by the acicular lobe; it differs 

 in this respect from the corresponding part in the genotype, A. (Cirri- 

 phorus) branchiata, in which the postsetal lobe is greatly prolonged. 

 The projecting acicular spines are yellow, thick and subcylindrical along 

 the shaft. The anal end is unknown. 



Distribution. — Aricidea (Cirrophorus) aciculata has been taken only 

 in San Pedro area, California, in 115 to 177 fathoms. 



Aricidea (Cirrophorus) furcata, new species 

 Plate 43, fig. 6 



Collections.— 2113-52 (2) ; 2114-52 (1) ; 2152-52 (23, type collec- 

 tion) ; 2153-52 (1); 2228-53 (1); 2311-53 (2) ; 2342-53 (1) ; 2414- 

 53 (1). 



The body in life and preserved is rust colored or reddish brown or 

 speckled with brown, especially in the branchial region. Total length is 

 about 10 mm and width about 1 mm. Segments number 50 or more. 

 Branchiae are present from the fourth setigerous segment and number 

 29 to 33 pairs. The prostomium is broadly depressed conical ; it has a 

 short clavate antenna; eyes are absent. Nuchal organs are crescent 

 shaped slits at the sides near the posterior margin of the prostomium. 



The first branchial pair is short and much smaller than the others; 

 the last 6 pairs diminish in size but are larger than the first pair. In 

 these segments the postsetal lobe is a small, digitate simple lobe; it is 

 pale in contrast with the darker body; it diminishes in size in the last 

 several branchial segments and can be seen in abdominal segments only 

 as a very small triangular lobe, present to the end. 



Setae in anterior and branchial segments are slender and distally 

 pointed. In abdominal segments the notopodial fascicles are much smaller 

 than neuropodial ones ; the first have 3 or 4 very long slender setae and 

 2 or 3 accompanying furcate setae (fig. 6) in which the two tines are 

 unequally long and one has serrations. Corresponding neuropodia have 

 fuller, longer spreading bundles of long, slender setae. 



Aricidea {Cirrophorus) furcata differs from A. (C.) lyriformis 



