EEPORT ON THE LAMELLIBEANCHIATA. 191 



support the strongisli ligament, also just in front of the apices. The interior of the 

 valves is opaque-white, hardly at all glossy, and rather rough through being somewhat 

 punctate iind irregularly striate. The anterior muscular impression is very long, with a 

 jagged outline, and falls partly within the subpunctate pallial line. The hinder scar is 

 much smaller, and somewhat coarsely striated. 



Length 15^ mm., height 14|, diameter 8. 



Habitat. — Station 316, off the Falkland Islands, in 3 to 5 fathoms ; mud. 



Lucina phcifera (A. Adams), from Borneo, is somewhat like this species in form, 

 having a radiating depression dowTi each side, but is more strongly concentrically ridged, 

 and has a single anterior lateral tooth in each valve, whilst Cryptodon falklandicus is 

 totally edentate. 



Cryptodon rufolineatus, n. sp. (PL XIV. figs. 4-4o). 



Testa insequilateralis, modice convexa, rotundata, albida, apices versus dilute rufescens, 

 lineis pallide rufis paucis radiata, subleevigata, striis incrementi tenuibus sculpta, antics 

 infra umbones sublunulata. Pagina interna dilute rufescens, haud nitida, radiatim 

 substriata. Cardo tuberculo parvo in utraque valva instructus ; ligamentum angustum, 

 parvnm, in sulco infra marginem dorsalem situm. 



This is a roundish species, but rather longer than high, and narrower and more 

 pointed in front than behind. It is moderately globose, somewhat inequilateral and 

 glossy, whitish, marked at intervals with narrow subpellucid zones, reddish towards the 

 umbones, and ornamented with a few pale red rays. The front dorsal margin is fainlly 

 concave and sloping, the posterior being longer, nearly straight, and less oblique. 

 There is a slight lunular depression, which is not, however, clearly circumscribed. The 

 hinge is almost toothless, there being only a small tubercular prominence beneath 

 the beak, probably in both valves, although I have but a single left valve from which 

 to judge. The ligament is totally internal, small, and located in a narrow groove 

 under the posterior dorsal edge. The interior of the valves is not glossy, except 

 near the outer flatfish margin. It is faintly tinged with red near the central part, and 

 exhibits, in a slight degree, the external rays, and is radiately substriated. The front 

 muscular scar is rather large, and, as usual, falls within the ^Jallial line. 



Length 6 mm., height 5, supposed diameter of the perfect specimen 3. 



Habitat. — Ofi'Levuka, Fiji, in 12 fathoms. 



This is a pretty little species, judging fi'om the single valve at hand, which, how- 

 ever, is probably not full grown, and remarkable for being rayed with colour, a very 

 unusual feature in shells belonging to the Lucinidse. 



