184 THE VOYAGE OF H.M.S. CHALLENGER. 



Habitat. — Dredged in 40 fivthoms among the reefs off Honolulu, Sandwich Islands. 



In form this species is somewhat hke Lucina quadrata, Angas, but has a different 

 style of sculpture, the concentric ridges being further apart, the radiating lirse more 

 distinct, and the inner margin of the valves consequently denticulate. The hinge- 

 characters are the same in both. 



Lucina (Codakia) Jijie7isis, n. sp. (PI. XIII. figs. 9-9a). 



Testa paulo obliqua, irregulariter rotundata, mediocriter convexa, alba, ante urn bones 

 aliquanto excavata, postice subdepressa, liris tenuibus numerosis radiantibus aliisque 

 concentricis grracilioribus mag-is remotis cancellata. Dens cardinalis unicus in valva dextra 

 conicus, medianus ; posticus lateralis erectus, intra marginem situs, anticus nuUus. 

 Ligamentum internum obliquum, profunde infra marginem dorsalem posticum locatum. 

 Pagina interna hand nitida, punctulata, ad marginem subtLIiter denticulata. Cicatrices 

 magnse ; paUii sinus simplex. 



This species is a little oblique, more or less rounded, moderately convex, white, 

 exhibiting a small luuular excavation and a slight depression down the posterior side at a 

 little distance from the margin. The sculpture consists of numerous very fine radiating 

 lirse, which are crossed by others stiU more slender and rather further apart. These 

 towards the hinder side are, except in the faint depression, a little lamelliform. The 

 umbones are smooth, moderately prominent, curved over towards the anterior side, and 

 not very acute. There is in the right valve a single conical erect cardinal tooth situated 

 just below the tip of the beak, having on each side a deepish pit which apparently 

 indicates the presence of two cardinals in the left valve, at present unknown. On the 

 posterior side there is a moderately elongate lateral tooth, sej)arated from the outer 

 margin by a deepish furrow. The ligament, which is internal, is deeply located in a long 

 narrow groove running obliquely from near the apex beneath the hinder dorsal Hne. 

 The inner surface of the valve is dull, without gloss, exhibiting a considerable number of 

 minute shallow punctures not arranged apparently in any particular order. The outer 

 margin is finely denticulated, the number of teeth being nearly one hundred. The 

 muscular scars are rather large and the palUal line simple. 



Length 5^ mm., height 5, diameter 4. 



Habitat. — Off Levuka, Fiji Islands, in 12 fathoms. 



'Lucina (Codakia) sp. juv. 



Habitat. — Amboina, in 15 to 20 fathoms. 



As but a single valve, 2^ mm. in length, was obtained, which has the appearance of 

 being but the young state of some larger species, I refrain from naming it, although 



