i63 



Measurements of Holotype : — Length 6.7 mm., height 6 mm., diameter 3 mm. 

 Locality : — A few shells of this beautiful species were brought up in a trawl at Saleh 

 Bay, north coast of Sumbawa (St. 312). 



4. Dentilucina [Callucind) jiabelliformis sp. nov. (Plate V, figs. 11, 12). 



The following is a description of this new species : — Species of a small size, shell 

 longitudinally ovate, moderately inflated, subequilateral, thick; anterior border running imper- 

 ceptibly into the greatly arcuate ventral margin, posterior border obliquely subtruncate; umbones 

 full, low, slightly projecting above the hinge-line ; no anterior and posterior dorsal areas; lunule 

 narrow, moderately impressed ; sculpture consisting of low but distinctly raised concentric lamellae, 

 which are sharp-edged near the margins particularly posteriorly, and irregular but distinct radial 

 threads in the interspaces; inner margin of valves smooth. Shell of a greenish yellow colour, 

 nacre white. 



Measurements of Holotype: — Length 6.5 mm., height 5.4 mm., diameter 3.8 mm. 



Habitat: — The holotype and two stray valves were brought up in a trawl at St. 256 

 (5°26'.6S., i32°32'.5E., 397 mètres). 



Remarks: — The peculiar form and sculpture of the shell of D. (C) fiabelliformis are 

 very distinctive. 



5. Dentilucina [Belhicina) macassari sp. nov. (Plate V, figs. 13 — 16). 



This new species is closely allied to the type-species of the subgenus Bellucina — Dentilucina 

 {Belhuiita) eticosmia Dali ^) (= Lîicina pisitm Reeve) — , but is easily distinguished by its much 

 smaller, more oblique more inflated and much thicker shell. The anterior and posterior dorsal 

 areas are well marked; the former being the better developed; the ventral border is less arcuate. 

 The sculpture consists of about a dozen well developed concentric lamellae; of thèse the last 

 6 — 7 are very strongly developed; and a large number of strong radiais running over the 

 concentric lamellae and in the interspaces; the criss-crossing of the concentric and radial lamellae 

 gives the surface a latticed appearance. The inner margins of the valves are strongly fluted. 

 The shell is of a dirty white colour. 



Measurements of Holotype: — Length 4.8 mm., height 5 mm., diameter 5 mm. 



Habitat: — A few shells of this interesting species were collected at Macassar (St. 71). 



6. Dentihicina [Belhicind) hedleyi sp. nov. (Plate V, figs. 17, 18). 



This new species I hâve named in memory of the late Charles Hedley, the distinguished 

 Curator of Molluscs in the Australian Muséum, Sydney. 



D. [B.) hedleyi is closely allied to D. {B .) rugosa (Hedley) ") but is distinguished by its 

 smaller, more regular and orbicular shell, with a more regularly curved anterior margin, more 

 truncate posterior margin, and less developed anterior and posterior dorsal areas. The sculpture 



i) Dall, W. h. — Proc. U.S. Nat. Mus., XXIII, p. 806 (1901) and Reeve, L., Conch. Icon., VI, Liicina^ pi. XI, figs. 66,(2,1^ 

 .(1850). Lamy, E., Journ. Conchyliol., LXV, p. 2H (1920) lias combinée! L. pisum with L. semperiana Issel from the Red Sea, but this 

 latter species, from its description, appears to be quite distinct. 



2) Hedley, C. — Proc. Linn. Soc. N. S. Wales, XXXIV p. 427, pi. XXXVII, figs. 17, (1909). 



