418 THE ANNELIDA POLYCHAETA. 



Locality. Between Galapagos Islands and Peru: Sta. 4651 (lat. 5° 42' S., 

 long. 83° W.). Depth 2,222 fms. Bottom of sticky grey mud. 11 November, 

 1904. One incomplete specimen. 



Gen. et sp.? 



Some tubes and a posterior fragment of a single specimen which cannot 

 with entire certainty be referred to any genus known to me. Behind the setig- 

 erous somites there is a more slender non-setigerous portion narrowing caudad 

 and consisting of six somites. The more posterior of these are strongly trans- 

 versely wrinkled. Between this region and the anal cirri is a smooth ring which 

 narrows at the caudal end and there bears a circle of cirri; at its caudal end it 

 is weakly longitudinally furrowed for a short distance. The cirri are subequal, 

 short, crowded, and twenty-six in number. The diameter of the circle of cirri 

 is clearly less than that of the anterior end of the smooth ring. Within the circle 

 of anal cirri a conspicuous, anal, cylindroconical body projects straight caudad 

 and bears the anus in a strictly terminal position. The cone is strongly radially 

 folded, with the midventral fold largest. 



Locality. Off Mexico: Sta. 3415 (lat. 14° 46' N., long. 98° 40' W.). 

 Depth 1,879 fms. Bottom of green mud and Globigerina ooze. Bottom temp. 

 36° F. 10 April, 1891. One fragment, with tubes. 



Ammochaeidae. 



Closely related to the Maldanidae is the Ammocharidae, which is not repre- 

 sented in the Albatross collections. It is sometimes known as the Oweniidae; 

 but as the genus Owenia Delle Chiaji is preoccupied, its place must be taken by 

 Ammochares Grube and the name Ammocharidae accordingly given precedence. 

 A second genus is Myriochele Malmgren, which differs from Ammochares, e.g., 

 in having no branchiae in the anterior region and the mouth more ventral in 

 position. 



Terebellidae. 



The members of this large and complex family have a general resemblance 

 to the ampharetids, of which they are apparently the nearest relatives. They may 

 be of very large size, the length sometimes being thirty or forty centimeters. 

 The body, as in the ampharetids, presents an anterior broader region, or thorax, 



