背鰭108軟条，臀鰭99軟条，胸鰭15軟条，腹鰭13軟条，鰓耙数2+0+8=10，鰓条骨数5，脊椎骨数22+99=121。頭長は全長の14.8％，眼径は4.2％，体高は5.8％，吻長は4.3％，両眼間隔は1.2％，上顎長は5.4％，胸鰭長は7.6％，腹鰭長は2.3％，背鰭前長は21.2％，臀鰭前長は28.7％，胸鰭前長は14.1％，腹鰭前長は12.2％。体は円筒形で延長し，尾部はやや側扁し徐々に細くなる。体長は頭長の約8倍，体高の約16倍。眼は卵円形で大きく，頭長は眼径の約3.8倍。眼の上縁は頭部背縁を形成する。吻は円鈍で短く，吻長はほぼ眼径に等しい。両眼間隔域は極めて狭い。上顎は下顎より前方に突出する。上顎後端は瞳孔の前縁下に達する。上顎後縁と下顎腹縁に平坦な皮質縁が発達する。両顎歯は鋭い円錐歯で，縫合部付近で2列に，それより後方では1列に並ぶ。数本の鋭い円錐歯が鋤骨上に密に並び，口蓋骨上に1列に並ぶ。鼻孔は1つで管状を呈す。鰓孔は下方へ伸び，胸鰭基底の後端付近の水準に達し，上方には大きな皮弁を有する。擬鰓がある。胸鰭は丸味を帯び，短く，その長さは頭長の半分。腹鰭は小さく，胸鰭よりやや前方に位置する。背鰭と臀鰭は低く，基底は長い。背鰭基底は臀鰭基底よりやや長い。背鰭起部は胸鰭先端上に位置する。側線は単線で不明確だが，腹縁近くをジグザグに走る。小円鱗が皮下に埋没し，各々は重なり合わない。頭部と胸鰭基底部は被鱗しない。口腔と鰓腔は黒い。体の背方は褐色で，腹方は淡褐色で，5つの三角形の暗色斑が体側にある。 　アルゼンチン　パタゴニアの陸棚上。 　チリ　パタゴニアにはLycenchelys antarcticus Reganが分布する。

（中村　泉）

　1 from Argentina(215.5 mm TL), FAKU AP 22. 　D108; A99; P₁15; P₂13; GR2+0+8=10; BR5; �X 22+99=121. HL14.8% of TL; ED4.2; BD5.8; SN4.3; IO1.2; UJ5.4; P₁L7.6; P₂L2.3; PreD21.2; PreA28.7; PreP₁14.0; PreP₂12.2.
Body elongate, cylindrical posterior part of caudal region slightly compressed, tapering; head about 7 times, body depth about 16 times in SL. Eye large, oval, its diameter about 3.8 times in head, its upper margin reaching dorsal profile of head. Snout round, short, nearly as long as eye. Interorbital region very narrow. Upper jaw more projected forward than lower jaw, posterior margin of upper jaw reaching anterior margin of pupil. Flat dermal fringes on posterior margin of upper jaw and ventral margin of lower jaw. Jaw teeth sharp, conical in two rows near symphysis and in a single row laterally. Several sharp conical teeth in a patch on vomer and uniserial on palatines. A nostril tube-like. Gill-opening extending to the same level as lower end of pectoral fin base, its upper margin with a large dermal lobe. Pseudobranchiae present. Pectoral fin round, short, its length about half of head. Pelvic fin small, situated slightly anterior to pectoral fin base. Dosal and anal fins low and long in base, base of former slightly longer than base of latter. Dorsal fin originating from above around tip of pectoral fin. Lateral line obsucure, running zigzag-fashion along ventral half of body. Small cycloid scales burried in skin, not imbricated. Head and pectoral fins naked. Buccal and branchial cavities blackish. Body brownish dorsally, paler ventrally with five triangular blotches on each side of body. Dorsal fin brownish and anal fin pale brown. Pectoral and pelvic fins yellowish white. 　Continental slope of Argentine Patagonia. 　Lycenchelys is represented by this species in Angentine Patagonia, and is known by L. antarcticus Regan in Chilean Patagonia.

(Izumi NAKAMURA)

Distribution of Lycenchelys bachmanni in Patagonia.

Sensory pores on head.

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