14 



name ^V. obliqua is distinct from the Lamarckian species of this name. This new species for 

 which he proposed the name N. S2iperba is a northern species, and is distinguished by its very 

 solid shell, which is proportionately longer than high, has a finely crenulated margin, and in 

 having a shght but constant inflexion of the dorsal margin just anterior to the long row of 

 teeth. In addition to the above distinctions pointed out by Hedley, it may be noted that the 

 posterior border of the shell of N. superba descends very obliquely and as a resuit the shell 

 is much more oblique than in the true A^. obliqua. 



Distribution ; — N. (^V.) superba is, according to Hedley, the common species of the genus 

 off the coast of Queensland at a depth of about 20 fathbms. It has also been recorded from 

 near New Guinea, Arafura Sea and the Torres Straits. 



The "Siboga" Expédition dredged from a depth of 29 mètres a beautiful spécimen, 20.5 mm. 

 long, at Anchorage near Seget, west entrance of Selee (Galewo) Strait (St 163). 



2. Nucula [Nuaila) cumingii Hinds. 



1843. Nucula Cumingii Hinds, Proc. Zool. Soc. London, p. 97. 



1844. Nucula Cumingii Hinds, Voyage "Sulphur", p. 62, pi. XVIII, fig. i. 



1845. Nucvla Cumingii Catlow & Reeve, Conch. Nomencl., p. 53. 

 1858. Nucula Cumingii Adams, H. & A., Gen. Rec. Moll., II, p. 545. 



1860. Nucula Cumingii Hanley in Sowerby Thés. Conch., III, p. 157, pi. CCXXIX, fig. 117. 



1860. Nucula Cumingii Reeve, Elem. Conch., II, p. 96. 



1870. Nucula Cumingii Sowerby, Conch. Icon., XVIII, Nuc7ila, pi. I, fig. 5. 



1890. Nucula Cumingii and N. Loi'ingi Paetel, Cat. Conch. Samm., III, p. 221. 



1896. Nucula Cumingii Casto de Elera. Cat. Sist. Filip., p. 806. 

 1905. Nucula Cumingii Hidalgo, Cat. Filip., p. 376. 



1909. Nucula Cumingii Lynge, D. Kgl. Dansk. Vidensk. Selsk. Skr. Nat.-Math., (7) V, p. 103. 



19 10. Nucula loringi Hedley, Austral. Ass. Adv. Sci., XII, p. 343. 



191 3. Nucula loringi and N. Cumingii Hedley, Proc. Linn. Soc. N. S. Wales, XXXVII, p. 264. 



Nucula [Nucula) cumingii is a large but thin shelled species. The surface of the shell 

 is smooth, except in full grown shells, which near the ventral margins show a number ofconcentric 

 rings of growth. 



Distribution : — A^. (yV.) cumingii has been recorded from the Malacca Straits, Singapore, 

 Gulf of Siam, Strait of Macassar, New Guinea, the Philippines and Australian waters. 



The "Siboga" Expédition trawled spécimens at St. 87 (o°32'S., i I9°39^8 E., 655 mètres), 

 St. 88 (o°34'.6N., ii9°8'.5E, 1301 mètres), St. 254 (5° 40' S., i32°26'E., 310 mètres) and 

 St. 300 (io°48'.6S., I23°23'.i E., 918 mètres), and dredged single spécimens at Anchorage 

 near Seget, west entrance of Selee (Galewo) Strait (St. 163) and Anchorage off Atjatuning, 

 west coast of New Guinea (St. 169). 



3. Nucula [Nucula) donaciformis Smith. 



1895. Nucula donaciformis Smith, Ann. Mag. Nat. Hist., (6) XVI, p. 15, pi. II, fig. 8. 



1897. Nucula donaciformis, Illustr. Zool. R. I. M. S. "Investigator", Moll., pi. I, figs. 5, ^a — c. 



Smith's description of ^V. (A^.) donaciformis is very complète, and needs no further 

 élaboration. It may, however, be noted that older shells hâve their ventral margin slightly more 



