I(i8 72 



L. fragilis, Phil. (or L. ladens L.). ' Sowerby (Marine shells of South Africa, 1892, 

 p. 61) also states Port Elizabeth as the locality for L. fragilis, Phil.; this is, however, 

 due to erroneous determination, as the most southerly limit of distribution for these 

 forms is the Cape Verd Islands and Loanda Island. In the supplement to "Marine 

 Shells of South Africa" Sowerby also says, regarding Loripes clausus, Phil., from Natal: 

 "This is the shell quoted by me, pi. 61, as Loripes lacteus" (according to Sowerby 

 L. lacteus L. is identical with L. fragilis, Phil.). In the specimens in the Museum 

 in Copenhagen the cardinal and lateral teeth are entirely wanting; moreover, they 

 do not at all resemble Luc. clausa, Phil. (= L. barhaia, Reeve). Krauss's descrip- 

 tion of his specimens, which are also from Port Elizabeth, ("auf dem linken Ufer 

 des Zwartkopflusses")" corresponds exactly with L. edentula L., therefore I do not 

 hesitate to put L. fragilis, Krauss = L. edentula L. Dunker's figure (Index moll. 

 mar. Japon., PI. VIII, Figs. 7—8) of L. edentula L. testa junior, looks very remarkable 

 and conveys the impression that the specimen figured must be abnormal. 



Lucina (Thyasira) ovum, Reeve. 



Lucina ovum, Hekve, Conchol. icon., VI, 1850, Lucina. .Sp. 21. 



l.oripes — — Angas, Ppoc. ZooI. Soc. London, 18()7, p. 92fi, No. 89. 



Koh Mak, sandy coast ('/s). 



Long. 15 mm. 



Distribution; — Andamans (Zool. Mus., Copenhagen). — Philippines, 

 Botany Bay. 



As mentioned under L. vesicula, L. ovum is not easy to unravel. It is not 

 so tumid as L. tumida, neither does the rather straight dorsal side pass so roundly 

 into the posterior end, the transition being more sudden. A great many authors 

 have looked upon Diplodonta globosa, Forsk., quite erroneously and have considered 

 it to be identical with Luc. ovum, Reeve (for further details compare Diplodonta 

 globosa, Forsk.). 



Lucina (Thyasira) buUula, Reeve. 



Lucina Inilhila, Heeve, Conchol. icon., VI, 185Ü, Lucina, Sp. 35. 



Cryptodon buUulus, Reeve, Edg. Smith, Rep. on the Lamellibranchiata of the Challenger Exped., p. 189. 



Between Koh Mesan and Cape Liant, .'S — 9 fathoms (-/ä). West coast of Koh 

 Chang, 10 fathoms, mud ('/s). N. of Koh Kahdat, 4 — 5 fathoms, coarse sand (V2). 

 W. of Koh Kut, 15 fathoms, mud ('hi). 



Long. 5- 10 mm. 



Distribution:— Amboina ("Challenger"), Adelaide, Port Essington (Brit. Mus.). 



' RucQuoy, Dantzenberg et Dollfus, Moll. mar. de Roussillon, II, p. 627, give the following 

 measurements for L. lacteus: — long. 23 mm., alt. 22 mm., crass. 13 mm. Kobelt, Prodromus faunae 

 moll. test. mar. europ. inhab., p. 370, gives the following measurements for L. fragilis, Phil.:— long. 

 9 mm., alt. U) mm. 



- Die südafrikanischen Mollusken, 1848, p. 5, No. 3. 



