i8 



1860. Niccala mirabilis Reeve, Elem. Conch., II, p. 96. 



1860. Nucitla mirabilis Hanley in Sowerby Thés. Conch., III, p. 155, pi. CCXXIX, fig. 114. 



1870. Niicnla mirabilis Sowerby, Conch. Icon., XVIII, Nuaila, pi. i, fig. 4. 



1882. Nucula mirabilis Dunker, Ind. MoU. Mar. Japon., p. 238. 



1885. Niiciila (Acila) mirabilis Smith, "Challenger" Lamellibranchia, p. 230. 



1890. Niicula [Acila) mirabilis, Paetel, Cat. Conch. Samm., III, p. 222. 



1895. Nncula {Acila) mirabilis Pilsbry, Cat. Mar. Moll. Japan, p. 151. 



1906. Nncula mirabilis Owston, Japan. Loochooan Shells, p. 32. 



The shell, which I refer to N. (A.) mirabilis agrées with Japanese shells of this species 

 in every respect. The measurements of this shell are: — Length 24.2 mm.; heighl 18.4mm.; 

 diameter 1 1 mm. 



Distribution: — N. {A.) mirabilis has so far been recorded from the Japanese waters only. 



The "Siboga" Expédition brought up a single shell of this species in a deep-sea trawl 

 at St. 18 (7°28'.2S., ii5°24'.6E., 1018 mètres). 



Remarks : — Dall ^) has suggested combining N. divaricaia Hinds, ^V. mirabilis Adams 

 & Reeve, N'. insignis Gould and N. ftiltoni Smith. He considers the différences between the 

 various forms to be only of the nature of racial characteristics of the différent forms foimd in 

 the adjacent areas of the Indo-Pacific Région. The material at my disposai is, however, very 

 limited to be able to offer any definite opinion on this question. 



Family Nuculanidae. 



Subfamily Nuculaninae. 

 Genus Nuculana Link. 



1807. Nitculana Link, Beschreib. Nat. Samm. Univ. Rostock, p. 155. 



1858. Leda Adams, H. & A. (nec Schumacher), Gen. Rec. Moll., II, p. 546. 



1860. Leda Hanley (nec Schumacher) in Sowerby, Thés. Conch., III, p. 106. 



1871. Laeda (sic), Sowerby (nec Schumacher) in Reeve, Conch. Icon., XVIII, Laeda (sic) 



pi. I (explanation). 

 1886. Leda Fischer (nec Schumacher), Man. ConchylioL, p. 985. 



1898. Leda Dall (nec Schumacher), Trans. Wagner Free Inst. Sci. Philadelphia, III, p. 579. 

 1925. Leda Woodring (nec Schumacher), Miocène Mollusks from Bovvden, Jamaica, Pelecypods 



etc., p. 15. 

 1930. Nuculana Stewart, Spécial Publication Philadelphia Acad. Nat. Sci., N" 3, p. 48. 



As I remarked in my notes on the genus Nticula (antea p. i), Schumacher's generic 

 name Leda was only a substitute name for the Lamarckian genus Nticula^ and the name Nziculana 

 Link must, therefore, be adopted for the genus which most authors hâve been designating as 

 Leda Schumacher. 



Stewart (op. cit.), has ably discussed the question of the type of the genus, and I agrée 

 with him that Nuculana permila (O. F. Mliller) based on the Chemnitzian figure "Conch-Cab.", 

 V, p. 7, pi. LV, figs. 550, 551 (1784) is the génotype. 



A large number of new gênera of this family hâve been set up recently by Iredale, but 

 beyond selecting their génotypes he has not published the description of any of them, and but 



i) Dai.L, W. h. — Trans. Wagner Free Inst. Sci. Philadelphia, III, p. 572 (1895). 



