106 Proceedings of the Biological Society of Washington. 



those of C weberi. The arms are from 130 mm. to 180 mm. long, the 

 average length being about 145 mm. 



The centrodorsal is thick discoidal, 7 mm. to 9 mm. in basal diameter, 

 and from 4 mm. to 6 mm. across the concave dorsal pole; the cirrus 

 sockets are arranged in two and a partial third closely crowded alternating 

 rows. 



The cirri reach a maximum of xxxii in number, but usually there are 

 only a few well developed, the majority being more or less rudimentary; 

 in general they resemble the cirri of C. tveberi but they are much more 

 slender, much less curved distally, and are composed of a larger number 

 of segments ; the proportionate number of more or less rudimentary cirri 

 is greater in this form than in C. weberi. The cirri are from 18 mm. to 

 .30 mm. in length (usually between 23 mm. and 26 mm.), and are com- 

 posed of from 20 to 28 (usually 24-26) segments of which the longest, in 

 the proximal portion, are about one third again as long as broad, and 

 the outer, from about the eleventh onward, about twice as broad as long, 

 the transition from the one type to the other being rather abrupt ; the 

 short outer segments have the dorsal surface convex in profile view, the 

 maximum height of this convexity being at first at the distal end of the 

 segments, but gradually moving proximally so that the distal segments 

 are provided with low blunt median tubercles; the opposing spine is 

 transversely elongate. 



Type. — In the Zoological Museum, Munich, Bavaria, from Sagami Bay, 

 Japan, down to about 150 meters (83 fathoms). 



Paratypes.— Cat. Nos. 35,776 and 35,777, U. S. N. M., from the same 

 locality. 



Comantheria intermedia is most closely related to C. weberi A. H. Clark 

 from the Lesser Sunda Islands. 



Dichrometra dofleini new species. 



The cirri are about xxx, 27-28, 30 mm. long; the segments in the proxi- 

 mal half are about as long as broad, and in the distal half slightly broader 

 than long with small dorsal tubercles or short spines, these beginning on 

 the twelfth segment. 



In the type specimen there are forty-seven arms 130 mm. long, developed 

 in 2, 2, 2, 2 order, or in 2, 1, 1, 2-2, 1, 1, 2 order on each ray. 



P2 is 16 mm. long with twenty-eight segments ; P3 is 18 mm. long with 

 twenty-seven segments, most of which are twice as long as broad, the 

 distal becoming much elongated. 



Type. — In the Zoological Museum, Munich, Bavaria, collected by Pro- 

 fessor Dr. Franz Doflein in Enoura Bay, Suruga Gulf, Japan, in about 

 150 meters (83 fathoms). 



Dichrometra dofleini is most nearly related to D. ciliata A. H. Clark 

 from the Ganjam coast of India in from 30 to 38 fathoms. 



Prometra owstoni new species. 



Centrodorsal discoidal, rather thick, the broad flat polar area 2 mm. 

 in diameter and covered with numerous small uniform rounded tuber- 

 cles ; the cirri are arranged in two irregular alternating marginal rows. 



