38 K.L. Lamprell, J. Stanisic 
anterior lateral tooth raised, peg-like; anterior cardinal oblique, thin, raised, joined to median 
cardinal towards the dorsal side of the hinge plate with a deep pit below their junction; median 
cardinal thick, raised, separated from the dorsal side of the hinge plate; posterior cardinal oblique 
slightly curved, joined to dorsal side of hinge plate; inner margin ridged. Hinge of right valve with 
anterior lateral widely separated from the anterior cardinal (by lateral pit), anterior cardinal oblique 
terminating at ventral edge of hinge plate, thin, raised, joined at dorsal side of hinge plate to median 
cardinal; median cardinal raised, slightly oblique, wider ventrally, separated from anterior and 
posterior cardinals by deep pits; posterior cardinal oblique, bifid, terminating short of ventral edge of 
hinge plate. Internal margins ridged, ridging stronger at the anterior and dorsal margins. Adductor 
muscle scars and pallial line poorly defined. Colouration: base colour white or tan with tan-brown or 
white v-shaped irregular markings over whole of shell surface; internally white with external colour 
patterns visible through the shell surface; escutcheon with tan-coloured chevron-shaped pattern 
crossing both valves. 
Material examined: Holotype: MNHN – Nouvelle-Caledonie: Secteur de Pouebo (Lagon: Іру, stn 
876, 30-70т, 20355, 164°51'E, 30-70 m, 13 Jan 1987). Length (anterior to posterior margin) 9 05 
mm, height (umbo to ventral margin) 8.15 mm, width of conjoined valves 5.9mm. i 
Paratypes: MNHN - Nouvelle-Caledonie: Secteur de Poindimie (Lagon: 9lv, 8rv, many juveniles, stn 
830, 105-110, 20°49'S, 165°19'E, 10 Jan 1987); Secteur de Pouebo (Lagon: AM C305575 2 D 
Irv, Пу, stn 876, 30-70, 20355, 164°51'Е, 13 Jan 1987). at? 
Other material: Plateau Chesterfield-Bellona: (Chalcal 1: stn D21, Пу). Nouvelle Caledonie: Grand 
Recif Sud (Lagon: stn 324, 1rv); Secteur des Belep (Lagon: stn 1104, Irv). ў 
Remarks: Lioconcha-richerdeforgesi sp. nov. is more ovate than L. philippinarum, L. dautzenbergi 
and L. melharteae, and does not have the raised umbones of these species. L. richerdeforgesi is ТЕ 
more densely ribbed than L. dautzenbergi and L. philippinarum and lacks the strong brown colour of 
these species and the white colour with orange markings or with tan-coloured zigzag patterns of L 
melharteae. The v-shaped, tan-coloured- markings of L. richerdeforgesi readily separate it from the 
other species of Lioconcha (Sulcilioconcha) discussed here. Compared with L. melharteae (which it 
most closely resembles), L. richerdeforgesi has more numerous ribs, is less inflated, has the lunule 
noticeably narrower, the anterior margin more widely rounded and lacks an angulated posterior 
Pitar (Pitarina) citrina (Lamarck, 1818) 
(Figure 4c-d) 
Cytherea citrina Lamarck, 1818: 306. 
Dione citrina Reeve, 1863: pl.10, fig.43. 
Pitar (Pitarina) citrinus Lamprell and Whitehead, 1992: sp.520. 
Dione ustulata Reeve, 1863: pl.11, fig.49. 
Diagnosis: Shell solid, inflated, subtrigonal, length to 40 mm. Sculpture of fine concentric lirae 
Colour orange, yellow or sometimes white, with purple posteriorly; interior white or pur le, 
sometimes rayed posteriorly. DID 
Material examined: Nouvelle-Caledonia: Nouméa (Pte aux longs cous, 3pv, J.Vidal; i 
Toro, 4lv, J.Vidal; Presqu'ile Nou, Anse Kuendu, 2ру, J. Vidal). S ӘБ Slam (Өлер 
Remarks: Pitar citrina is widely distributed throughout the Indo-Pacific, it is a shallow-water species 
which was not represented in the expedition material but was donated to the MNHN from the J Vidal 
collection. : 
