MOLLUSCA, I- SMITH. 89 



tin 1 posterior dorsal ;uva is liner ih;in in A.decussata, and mon- distinctly defined bv an 

 ubtuse. rounded urubonal nd'_;e. The po-tenor adductor nii|uvssion in .1. decusxata is 

 large ami round. wheiva- in .1. novcB-zeolandia it is obliquely truneate In-hind 



Length. C>7 nun. : height. :'('> : iliann-tcr. - _'4. 



Station '.H'I. nurth d|' New /calami : 70 la t hums. 



Tin- three characters above referred iu (1) the crenulation of the lateral margins: 

 (_') eulunr : (:') fine posterior dorsal sculpture should. I think, be sufficient to separate 

 this species t'ruin .1. decussata of Sowerloy. 



Similar marginal rrenulatiuii occurs in Area fusca, l>ruguiere. uf which .1. rodatzi, 

 1 (linker, is a synonym. 



28. Glycimeris laticostata (i^nov and Gaimard). 



/', , liuii-iiliin liitii'i'xlutiis. (,). anil (>., V(iy. " Astrnlalir.' /mil.. Mil. III. ji. Ilili, jil. 77. ti^s. 46 



(1835). 

 Glycimeris laticostata : Sutt-r, Man. N./. .M<ill., j>. s. r )l, j.l. LVI, iii;.s. :{, .'i.\. 



Station l:U. Spirits Bay. near North Cape, north of New Zealand : I I -JO fathoms. 

 Two dead valves with some egg-capsules of a Gastropod attaehed. also inerustin^ 

 1 'olvx.ua. etc. 



L".I. <_'lilitini/x i-niixiH-iiitit. n. sp. L'l. II. h'gs. 3 and 8. 



Shell allied to /'. z<'l<in<H<r. (irav. liut Hatter, with smaller ears, esperially the 

 anterior auricles ; valves thinner, with al><>ut twenty-four delicate principal eosta.-. with 

 one or two still finer ones in the intervening grooves ; all minntelv si[iiamose. the scales 

 more closely packed in some specimens than in others: anterior auricle of left valve 

 having about eight thread-like s<|iiamate radiating lira-, the one forming the dorsal line 

 stronger than the rest: the posterior auricle similarly sculptured, luit lira- fewer: 

 anterior ear of ri^'ht valve with a moderately deep liyssal sinus, with live radiating 

 lira- aliove. the upper marginal one twice as strung as the rest; colour pale pinkish or 

 reddish, sometimes showing a few irregular opaque white markings: interior of tin- 

 valves M-lnov. whiter than the outside, radiately grooved and ridded. 



Length. 'J'.i mm. : height. 26'5; diameter. (> 5. 



Stations DO and '.IC, north of New /ealand : 70-100 fathoms. 



Then- is a marked difference in the si/e of the anterior auricles in this species and 

 /'. zilninl'nr. and besides being Hatter, and mure delicate in texture, the present form 

 has a tendency towards obliquity in growth. 



:io. ('lil,nin/x (I'lilliinn) eonvexus (HUUV and Gaimard). 



!',,!, ii COnvCXUS, <>. :in<l (!., \'ny. Astl'ulalie." /mil., \ul. Ill, ji. I |."i, jil. 7i. lii,"~. 1 ." 



Siit.-r. Man. N./. M'.ll.. p. 879, pi. LVI, ti-s. s. s\. 



Siation 90. north uf New /ealand : loo fathoms. 

 Olllv a few dead valves euven-d with I'ulvx.ua. etc. 



