ANAITIDES COMPSA. . 107 



dorsal lobe becoming subtriangular; at the same time they decrease regularly 

 and decidedly in size to the first, which occurs on somite V. Caudad from 

 the fortieth parapodium the parapodia retain nearly the same general form and 

 relations but increase in size to the middle region. The notocirrophore becomes 

 proportionately still larger and distally more expanded, with the style in com- 

 parison with it narrower all the way about its line of attachment. In the poste- 

 rior region the parapodia decrease regularly and strongly in size caudad. 

 Toward the caudal end the styles of the neurocirri are narrowed, acutely pointed, 

 lanceolate, while the notocirri remain very broad in comparison with the rest 

 of the parapodium. (Plate 16, fig. 5, 0.) 



The setae are all colorless. They are arranged in single fan-shaped series, 

 one supraacicular and one subacicular, though the two series are not always 

 distinctly separated. In one specimen there are, e. g., ten setae in each of the 

 two fascicles of the eleventh parapodium; in the fortieth parapodium there are 

 twenty in each series; in a parapodium from the middle region the number is 

 about the same; while in a parapodium about the thirtieth from the caudal end 

 there are six in each fascicle or series, the reduction in number occurring in a 

 general way in correspondence with the reduction in size of the parapodia. The 

 shafts of the setae are only slightly curved. Each is rather abruptly and con- 

 spicuously enlarged at the distal end to form the socket, the enlargement being 

 closely covered on each side of the oblique socket with short acute prickles or 

 hairs. The blade is long and slenderly tapered, the tip fine, always conspicuously 

 curved, with the concave edge strongly, closely, and very finely serrate. The 

 free portion of the setae shorter than the neuropodia. (Plate 15, fig. 8). 



In a paratype 195 mm. long, the fully extended proboscis is 6 mm. long, by 

 far the greater proportion of the length belonging to the distal, unridged portion. 

 The orifice is surrounded with seventeen low, proximally thick and contiguous, 

 distally very shortly subcorneal, papillae. In other specimens the proboscis 

 is not fully protruded, though all show clearly the proximal papillose division. 

 In this proximal region there are twelve longitudinal rows of papillae, these being 

 separated into groups of three by a wider middorsal, midventral, and on each 

 side a mediolateral, smooth interval. In each row there are most commonly 

 eighteen papillae, though the number may fall to a few less than this in the 

 ventral series and, on the other hand, may rise as high as twenty-two or twenty- 

 four on the dorsal side. Each papilla is strongly flattened in the direction of the 

 longitudinal axis of the proboscis, its outUne as a whole being somewhat semi- 

 circular. 



