ANATOMY AND SYSTEMATICS OF CARDIOLUCINA 



115 



259587, 259028, 260541, 261338, 259901, 261873). MAURI- 

 TIUS: 1.5 m N.W. Black River, 15m (ANSP 273431). PAKISTAN: 

 Karachi (BMNH ace. 1831). INDIA: 80 miles S.W. Bombay 17° 

 54'N 72 °27'E, (USNM 716676); Madras (BMNH 1953.1.30.190- 

 4); Madras (BMNH 89.2.17.23-6); Tondi, Madras (NMW ace 

 55.158); Manapad (BMNH 1953.1.30.26); Mandapam, Gulf of 

 Mannar, 3m (ANSP 302433); Tuticorin (BMNH 1953.1.30.188- 

 89); S. of Krusadai I., Gulf of Mannar, 18m (ANSP 301196); 

 Andaman Islands (AM C.040397, C.040597); Andaman Islands 

 (NMW 55.158). SRI LANKA: Colombo (AM);Trincomallee, 29m 

 (AM); E., S., and N. coasts (AM C.309467); BMNH 1963491; Palk 

 Strait, 22m (AM); 9°34.5'N 80°39'E (AM C.30946 1 ); northern tip of 

 Eluvativu I., (ANSP 211085). BURMA: 57 miles N.W. Tavoy I., 

 Anadamans Sea, 39m (ANSP 293254). THAILAND: Koh 

 Kahdat(AM C.031287); Phuket (USNM 661 156); south end Light- 

 house I., Phuket, 5m (ANSP 286500); 25 miles N.N.W. Phuket, 42m 

 (ANSP 291734). MALAYSIA: Mersing Island, E. Malaya, 3.5m 

 (AM). SINGAPORE: BMNH ace. 2172; Singapore (AM C.3437); 

 NMW ace 55.158. INDONESIA: Kalimantan (AM C.309470). 

 PHILIPPINES: Corregidor, Bay of Manila, intertidal (BMNH; 

 Manila Bay, 1 8m (ANSP 28 1443); Manila Bay, 1 8m (ANSP 328655 ); 

 off Antonia I., E. Panay, 40m (USNM 293697); N. of Marinduque, 

 353m (USNM 295 197); Lataau I., 33m (USNM 236058); Malampaya 

 Sound, Palawan, 25-35m (USNM 297395); off Tinkata I., Tawi 

 Tawi Islands, 30m (USNM 257677); VIETNAM: VungTau, Chilins 

 (ANSP 330797). AUSTRALIA: Western Australia, Shark Bay 

 (AM C.69245); Carnarvon, 7.6m (AM); Carnarvon (AM C.69270); 

 210 miles N. of Broome, 230m (AM); 110 miles N. of Melville 

 Island, Arafura Sea (AM); 72 miles N.W. of Dampier Island, 1 10m 

 (AM 2405). 



Cardiolucina siquijorensis Taylor and Glover, new species 



Fig. 25 



Type MATERIAL. Holotype, articulated specimen (Fig. 25 b) USNM 

 812176. H= 3.4 mm, L=3.5 mm. Paratypes, USNM 812177, 812169. 



TYPE LOCALITY. Siquijor, Solong-on, Siquijor I., Visayan Islands, 

 Philippines (09° 13'10"N 123° 27'30"E) depth 2-3 m. 



Shell description. Shell very small, to a maximum height of 3.5 

 mm, outline circular H/L 0. 97, inflated, T/L 0.39, tumidity of single 

 valve to 1.3 mm. Shallow posterior sulcus with concentric lamellae. 

 Anterior sulcus absent. Lunule shallow, heart-shaped. Anterodorsal 

 area indistinct, posterodorsal area with concentric lamellae. Exte- 

 rior sculpture, fenestrate, of 1 1-12 broad, straight-sided, radial ribs. 

 Interspaces wide, but narrower than the ribs. Ribs are slightly 

 broader towards the anterior. About 14-16 thin, concentric lamellae, 

 project slightly above radial ribs. Hinge plate robust. Left valve with 

 single posterior lateral tooth, the dorsal edge of the socket extended 

 into a sharp rim (Fig. 22 e); two cardinal teeth, triangular in shape 

 and more or less equisized; single anterior lateral tooth. Right valve 

 with single anterior lateral tooth, a single central cardinal tooth and 

 a robust posterior lateral tooth. Ligament extends from beak to the 

 dorsal end of the posterior lateral tooth (Fig. 22 e). Inner margin with 

 12 coarse crenulations, and fine beading extending to the hinge 

 margins. Anterior adductor muscle scar elongate, not buttressed, 

 with only ventral tip detached from pallial line. Posterior adductor 

 muscle scar rounded. Pallial line continuous. Shell creamy white. 



Comparison with other species. This species is similar in size 

 and ornament to C. pisiformis but is distinguished by fewer and 

 broader radial ribs, the shallower lunule, the two equal-sized cardi- 

 nal teeth in the left valve and the single cardinal in the right valve. 



Habitat and distribution. As for type locality. 



Material examined. PHILIPPINES: Siquijor I., collected with 

 type material (USNM 812177, 812176, 812169). 



Cardiolucina sp. 



Fig. 26 



In addition to the species described, we have four lots from the 

 Philippines consisting of rather badly preserved, disarticulated shells 

 and two rather better preserved juvenile shells. These are distinct in 

 a number of shell characters from the other Cardiolucina species. 

 Because the adult specimens are badly preserved and because 

 juveniles often differ considerably from adults, we are reluctant to 

 describe a new species based on this material. 



The adult shells have maximum height of 10.8mm, with tumidity 

 of a single valve to 2.7mm and H/L 0.98, T/L 0.5. The posterior 

 sulcus is broad and shallow, the anterior sulcus absent. About 17-18 

 prominently scalloped, concentric lamellae, with more than 20 fine, 

 rounded, radial ribs, which do not cross the concentric lamellae. The 

 interspaces between the ribs are narrow, but relatively deep and the 

 intersection of the concentric and radial ornament produces a deeply- 

 pitted appearance. The lunule is heart shaped and relatively deep. In 

 the left valve, there is a single posterior lateral, two triangular 

 cardinal teeth, and a single posterior lateral. The inner margin of the 

 shell has about 25 crenulations. 



This species is similar to C. semperiana but can be distinguished 

 by the lack of the anterior sulcus, the shallower posterior sulcus, the 

 pitted appearance of the shell surface and the more rounded 

 anterodorsal area. 



Material examined. PHILIPPINES: off Sibugay I., E. of 

 Masbate, 1 98 m (USNM 292666); Daram Channnel, W. Samar, 48 m 

 (USNM 292830); off Matocot Point, W Luzon, 400 m (USNM 

 295706); off Corregidor Light, 73 m (USNM 294200). 



ATLANTIC OCEAN SPECIES 



Cardiolucina lamothei (Dautzenberg, 1913) 



Figs 27 a & b, 28 



Lucina lamothei Dautzenberg, 1913: 100-101, pi. 3 figs 50-54. 

 Phacoides (Parx'ilucina) congoensis Thiele & Jaeckel, 1931: 220- 



221, pi. 4 fig. 91. 

 Phacoides (Bellucina) lamothei (Dautzenberg) - Lamy 1920 : 215. 



Type material. Figured specimens of L. lamothei - two syntypes 

 from Tamara, Archipel de Los, Guinee, marked TYPE in 

 Dautzenberg's handwriting (MNHN). Numerous other specimens 

 from localities mentioned by Dautzenberg (1913) are housed in the 

 Royal Belgian Institute of Natural Sciences (IRSNB inventory I.G. 

 1059 1 ). Our figured specimen is from a sample sent by Dautzenberg 

 toTomlin(NMW 1955.158). 



Type locality. West Africa, Tamara, Archipel de Los, Guinee. 



Shell description. Shell solid, very small, height to maximum 

 of 4.0 mm. Subquadrate, inequilateral, slightly extended anteriorly. 

 Not inflated. Anterior sulcus shallow leading to marginal sinus. 

 Umbones are conspicuous, prosogyrate. Lunule very small, under- 

 neath beaks. Anterodorsal area indistinct and slightly convex. 

 Escutcheon with concentric lamellae. Exterior sculpture of 15-18 

 prominent, narrow concentric lamellae, which are slightly reflexed. 

 About 40 fine, radial ribs in the interspaces between concentric 



