JIEPORT ON THE LAMELLIBKANCHIATA. 47 



Length 4 J mm., height 3, dinmetcr 2|. 



Habitat. — Off Christmas Harbour, Kerguclen IsLand, in 120 fathoms. 



A pretty little species, remarkable for its elevated thin lamelliform lirse. 



Necera angasi, n. sp. (PI. IX. figs. 2-26). 



Testa NecBrcB rostratce similis, sed margine dorsi antico magis obliquo, rectiusculo, 

 margine ventrali postice minus subito contracto, denteque laterali posteriori valv£e dextrse 

 graciliori. 



Length 9^ mm., height 5, diameter 3^. 



Habitat. — Station 164b, off the coast of New South Wales, in 410 fathoms; green mud. 



This species is so very like Nea'ra rostrata of Spengler, that to give a detailed 

 description of it becomes unnecessary. It docs, however, differ a little in form, the hinder 

 dorsal slopes being almost rectilinear and a trifle more oblicpie. There is a difference 

 also in the lower margin, the contraction at the commencement of the rostrum being less 

 sudden, and the anterior end is rather more acute. The sculpture in both forms is of the 

 same character, although that in the Australian shell is perhaps somewhat more delicate. 

 The present species has also a smaller and more slender hinder lateral tooth in the right 

 valve. I have much pleasure in naming this species after my friend G. F. Angas, Esq., 

 who lias written several important papers on the Molluscan fauna of Australia. 



Since the above description was written the only specimen obtained has been 

 accidentally smashed, but fortunately after leaving the artist's hands. 



Necera elegans, Hinds. 



Nerera elegans, Hinds, Proc. Zool. Soc. Loud., 1843, p. 7G. 



Necera elegans, A. Adams, Ann. and Mag. Xat. Hist., 1864, vol. xiii. p. 206. 



Necera moluceana, Adams and Eeeve, Zool. Voy. Samarang, ]\Iollusca, p. 84, pi. xxiii. fig. 4. 



Habitat. — Station 189, Arafura Sea, south-west of New Guinea, in 25 fathoms, green 

 mud (Challenger) ; New Guinea, China Sea, and Singapore, on a muddy floor, in from 

 7 to 18 fathoms (Hinds); Molucca Islands, Gillolo (Adams and Reeve); Mine Sima, 

 Japan, in 63 fathoms (A. Adams). 



I fuUy concur Tvith Adams and Tryon ' in considering the Necera, rtwluccana synony- 

 mous with this species. It is a form easily recognised by the peculiarity of its oblique 

 sculpture. It is rather convex, thin, not glossy, covered more or less with a very thin 

 pale epidermis, sharply rounded in front, contracted and narrowly rostrate behind. The 

 ventral outline is regularly widely arcuate under the main portion of the shell, with a 

 sudden sinuation at the commencement at the beak. The anterior dorsal margin is 



' Amir. Journ. Conch., vol. iv., Appendi.x, p. 97. 



