34 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



been collected in many localities off Japan in from 62 to 549 meters 

 (34 to 300 fathoms). 



H. L. Clark, who has often observed six armed specimens, believes 

 that this figure is the normal one for the young of A. pergamena, 

 although the adult only has 5 arms ('11, p. 284) ; but Matsumoto is not 

 of this opinion ('17, p. 36). 



ASTERONYX LOVENI Miillcr and Troschel. 



See for bibliography : 



Asteronyx loveni Kcehler ('04), p. 167. — H. L. Clark ('11), p. 285. — Doder- 

 lein ('11), p. 115.— Mortensen ('12), p. 264.— H. L. Clark ('13), p. 219; 

 ('15), p. 180; ('16), p. 78.— Matsumoto ('17), p. 33. 



Localities. — Albatross station 5444; East coast of Luzon, San Ber- 

 nardino Strait to San Miguel Bay; Atalaya Point, Batag Island, 

 bearing S. 65° E., 9.45 kilometers (5.1 miles) distant (lat. 12° 43' 51" 

 N., long. 124° 58' 50" E.) ; 563 meters (308 fathoms) ; June 3, 1909; 

 gn. M. 



One specimen (Cat. No. E. 168, U.S.N.M.). 



Albatross station 5650; Gulf of Boni, Celebes; Lamulu Point bear- 

 ing N. 5° W. 23.16 kilometers (12.5 miles) distant (lat. 4° 55' 45" S., 

 long. 121° 29' 00" E.) ; 988 meters (540 fathoms) ; December 17, 

 1909 ; gn. M. 



One specimen (Cat. No. E. 167, U.S.N.M.). 



Notes. — In the larger individual the dimensions of the disk are 

 18 mm. by 15 mm. The arms are incomplete, but two of them are 

 preserved for the greater part of their length. In spite of the rela- 

 tively large dimensions of the disk, the first spine does not show any- 

 where along the arm the least tendency to become elongated and to 

 take the form so well known in A. loveni. Mortensen has recently 

 shown ('12, p. 264) that this development of the ventral spine usu- 

 ally begins to show itself when the disk reaches a diameter of be- 

 tween 15 mm. and 20 mm., but that it may begin very much later; 

 thus in one of the specimens which he studied, in which the diameter 

 of the disk was 20 mm., the ventral spine had not yet begun to elon- 

 gate. It is not surprising, therefore, that in my specimen the ven- 

 tral spine has not yet taken on its normal development. 



But by way of compensation I notice in the specimen from station 

 5444, which has a disk diameter of only 13.5 mm., an elongation of 

 the first ventral spine 20 mm. beyond the disk, and a little further 

 on this spine reaches almost the length of a segment. 



