CHLOEIA ENTYPA. 31 



ventral line a sharply defined, wide, depressed band or neural channel. 



The branchiae are large. Each one normally extends caudad much as in 

 C. maculata Potts, but is much longer, typically overlapping the succeeding 

 somite and branchia. The branches from the main trunk of the branchia are 

 relatively long and numerous; they may bear a few secondary branches or 

 pinnulae but the more distal ones are more commonly simple. 



The dorsal cirri are very conspicuous because of their strongly contrasting 

 deep violaceous color. Each is attached caudad of the notopodial tubercle as 

 usual. They are distally slenderly subulate and in the preserved specimen 

 are shorter than the long ventral setae. The ventral cirri are pale throughout 

 and are slenderly subulate. Each is attached on the caudoventral side of the 

 ventral fascia. 



The dorsal setae are distinctly coarser than the ventral. The prevailing 

 type is moderately curved and has the furcate apical part more or less at an 

 angle with the proximal division. The larger distal branch is long and acute, 

 the shorter branch or spur being parallel with it excepting the tip which curves 

 slightly outward or away from the axis. (Plate 13, fig. 8). The principal 

 branch is prevailingly smooth along both edges. A second type occurs in the 

 middle and especially the posterior region. The setae of this type are coarser. 

 The outer edge of these setae is very finely serrulate, the teeth being minute and 

 occurring chiefly on the distal half. (Plate 14, fig. 1). None of the setae show 

 such coarse teeth as occur for instance in C. fiava (Pallas). Only one form of 

 setae was observed in the ventral fasciae. These are finer and longer than the 

 dorsals. In the furcate tip of these setae the main branch is straight and slender 

 with the edges smooth. The spur is short and straight and a little divergent. 

 (Plate 13, fig. 9). 



Locality. Off Mexico. Sta. 3418 (lat. 16° 31' N., long. 99° 52' 30" W.). 

 Depth, 66 fms. Bottom, brown sand with black specks. Bottom temp., 39° F. 

 Exped. 1891. 



One specimen. The depth is exceptional for the genus. 



In general structural features this species approaches the widespread 

 C. fiava (Pallas), though it is a much smaller form with correspondingly fewer 

 somites. It has the similar conspicuous, purplish brown, dorsal cirri arising 

 from a non-pigmented base, but lacks the other dark markings so conspicuous 

 in fiava and does not present the more brightly yellow tips to the setae. The 

 branchiae and setae differ clearly from those of fiava in details of form and 

 structure. 



