718 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxx. 



Bod}-, lanceolate; maxillary extending to front of orbit; gill rakers, 

 17 below angle of arch; origin of dorsal over posterior third of pecto- 

 rals; pectorals, 2.1 in head; longest dorsal ray about half depth of bod}-; 

 caudal, 2.1 in head. Color in spirits, brownish above, white below; a 

 brownish spot on opercle above; fins pale. 



This description is taken from a specimen 4 inches long, from Ono- 

 michi, on the Inland Sea. We have also specimens from Hakodate. 

 The species is enormously abundant on sandy shores open to the sea in 

 northern Japan. We can not separate the Japanese species from 

 Aimnodytes personatus of the coasts of California and northward, the 

 only apparent difference being a number of anal rays rather higher in 

 the Japanese species {}M)) than usual in the American (24). The Euro- 

 pean species Ammodytes toblmius Linnaeus has but 120 to 130 lateral 



-yppT^'^'^^^^^m:^/ 



Fig. 2.— Ammodytes personatus (from Onomiehii. 



folds, but is otherwise scarceh^ different. Ammodytes americanus of 

 our Atlantic Coast is scarcely different from ^1. tobianus^ and Ammo- 

 dytes alascanus oi the Aleutian Islands (D. 62; A. 31; folds, 160 to 182) 

 is doubtf ull}' distinct from A. personatus. At present it seems safe to 

 identif}' the Japanese species as Ammodytes personatus. 

 {Pefrsonatus^ masked.) » 



HYPOPTYCHUS Steindachner. 

 iTypojj/yc/tw.s Steindachnek, Ichth. Beitr., IX, 1880, p. 20. (dybowskn.) 

 Bod}'^ lanceolate, formed as in Ammodytes., but scaleless and with- 

 out oblique folds. Head pointed, the premaxillaries protractile, the 

 chin prominent; upper jaw with small teeth; lower jaw toothless; 

 vomer with a conical prominence. Gill openings very wide, the mem- 

 branes fully united, but free from the isthmus; opercles thin, unarmed. 

 Lateral line along middle of sides; no fold of skin on side of belly. 

 Dorsal and anal simihir, confined to the posterior part of the body, 

 each of about 20 soft rays, the anterior raj's highest; vent just before 

 anal; pectorals rather long, symmetrical; ventrals wanting. Caudal 

 forked. A low translucent fold of skin along middle line of belly from 

 the l)ase of pectorals to the vent. Branchiostegals, 4. Japan Sea. 

 (vTto, below; tttvx'/ fold). 



3. HYPOPTYCHUS DYBOWSKII Steindachner. 



Hypoptyvhux dyhou'skii Steind.achxek, Ichth. Beitr., X, 1880, p. 20, pi. ii, fig. 3; 

 Bay of Strielok, Japan iSea (near Vladivostok). — Schmidt, Pise. Mar. Orient., 

 1904, ]). 210; Bays of Patroke, Mauka, Aneva, and Corsakou; all near 

 Vladivostok. 



