234 PROCEEDINGS OF THE NATIONAL MUSEUM vol.88 



spines on the median segments of the outer ramus and five pairs on 

 the median segments of the innei-. There are two long thin spines 

 on the posterior distal angle and usually one very fine short spine 

 on the anterior distal border. 



The caudal appendages (fig. 5, c) are short and flat with truncated 

 ends bearing fine spines. There is no penis. 



/Sise (in millimeters) as follows: 



Capittjlum : 



Length 10 10 9 9 8. 5 11 



Width 5 5 4.5 4 4 7 



Peduncle : 



Length 3 3 3 2 2 4.5 



Width 2 2 2 2 2 3 



Localities. — Off Allen Bank, Puget Sound, April 8, 1937, 60 meters; 

 one specimen on Boltenia villosa, four specimens on Pyura hmistor. 

 Off Point No Point, Puget Sound, April 7, 1933, 90 meters, one adult 

 and two immature on coral. 



Genus MITELLA Oken 



MITELLA POLYMERUS (Sowerby) 



Synonymy : See Nilsson-Cantell, 1921, p. 165. 



This species is abundant in many localities in Puget Sound and 

 individuals often attain a large size. The scales on the median part 

 of the peduncle are intermediate in size between those figured for 

 forma typica and forma echinata by Broch (1922). Gruvel (1905) 

 and Nilsson-Cantell (1921) state that the scales on the lower part of 

 the peduncle are in the form of spines and somewhat irregularly ar- 

 ranged. An examination of a number of specimens failed to reveal 

 any "spines" on the peduncle, which is in accord with the findings of 

 Broch (1922). 



The mouth parts and cirri agree with the description of Darwin. 

 The membrane covering the prosoma and the sack, as well as the 

 mouth parts and some of the segments of the cirri, is covered with 

 fine spines. The spines are slightly larger and more numerous on 

 the membrane just below the labrum. The papillae on each side 

 of the filamentary appendages and on the sack have short spines and 

 si^inules similar to those found on the filamentary appendages. 



In many of the large specimens the caudal appendages have two 

 segments, with short spines at ^le upper edge of each. In two speci- 

 mens only one caudal appendage occurred. 



Localities. — ^Washington: False Bay, San Juan Island; Iceberg 

 Point, Lopez Island; Goose Island; Seal Rock and Waadah Island, 

 Neah Bay. Bandon, Oreg. Trinidad, Calif. Ensenada, Lower 

 California. 



