1911.] NATURAL SCIENCES OF PHILADELPHIA. 251 



Jaws (described from a co-type, station 4,431) hard and firm. Man- 

 dibles with stout, divergent, nearly black stems joined only slightly 

 by an anterior isthmus; masticatory plates hard, white, oval, with 

 smooth, entire anterior border. Maxillae black or nearly so. Carriers 

 of forceps-jaws nearly as wide as long, broadly rounded behind; the 

 forceps of the usual falcate form; II very large and stout with five 

 large teeth and one small one on each side; III on the right side is a 

 long narrow piece with eleven teeth diminishing in size from before 

 backward and is paired with two pieces on the left side with four and 

 eight teeth, respectively; IV bears a single prominent tooth on each 

 side; V is a small toothless plate. Two other specimens dissected 

 agree in all essentials, the teeth being generally tipped with white and 

 the border of the mandible in one case tridentate. 



Color of the full-grown specimens pearl or gray with a beautiful and 

 delicate iridescence. Two of the larger specimens have the dorsum 

 finely mottled with brown. The smallest examples are more dis- 

 tinctively colored: one is pale brown above with an obscure white 

 zone on IV and V; another (the smallest) has the first three segments 

 almost solidly orange-brown, IV and V pure opalescent white and 

 several succeeding segments annulated with brown and white. 



Stations 4,312, off Point Loma Lighthouse, vicinity of San Diego, 

 95-135 fathoms, fine gray sand and rock; 4,373, same locality, 95-225 

 fathoms, green mud, sand and rock; 4,377 (Type), same locality, 

 127-299 fathoms, green mud and sand; 4,420, off San Nicolas Island, 

 32-33 fathoms, fine gray sand; 4,431, off Santa Rosa Island, 3S-41 

 fathoms, varied bottom; 4,463, off Point Pinos Lighthouse, 2S5-357 

 fathoms, green mud; 4,532, same locality, 30 fathoms, gray sand 

 and rock. 



This species is related to E. bilobata Treadwell, but is readily dis- 

 tinguished by several characters, especially by the notably smaller 

 number of gill filaments. The type of E. bilobata is 5.5 mm. wide and 

 the first gill (on IX) has nine filaments, the maximum reaching eighteen. 

 A specimen of E. multipectinata of the same size has only two filaments 

 on the first gill and a maximum of seven filaments. 



Other species having pectinate gills for the entire length which have 

 been reported from the Pacific Ocean are E. antennata Savigny, E. 

 microprion v. Marenzeller and E. flavo-fasciata Grube. All of these 

 have the gills beginning farther forward and differ in other respects 

 also. 



