OP SOUTHERN INDIA. 253 



40. — L. Tiironiensis is either a Mi/sia or a Lucina. 



41-45. — L. Nereis, s^ih-pisum, CatnpaniensiSj MicheUni, Harlei are apparently Luc'vikb. 



\Tj, lenticularis, Goldf., is one of the typical species of I]npliyla, Gabb, vide p. 156]. 



46-52. — L. jproducta, lohata, stib-nmmsmalis, 1850 {= tenuis, Miiller, Petrsef. Aach. Kreid., 

 pt. ii, 1851, p. %^), Geiniizi, cretacea, (vide Favre, Descrip. M. foss. de Lemberg, 1869, p. 115), 

 sub-squamulata and S2ipr a -cretacea, all appear to be true LucincE, 



53-56. — L.in(Equalis,corhisoides^ Pkillipsiana, d^ndi Fischeriaiia, d^Orb., (Eichwald, Leth. ross. 

 xi livr., 1867, p. 648, and Murchison, Ver. and Keys. Pal. d. Euss., pi. 39, figs. 1-8, and pi. 38, 

 figs. 31-32,) are apparently Lucince ; Eichwald quotes them from neocomien beds. 



bl.—L. discors, Eichw., ibid. p. 656, pi. 24, fig. 8, belongs to the sub-genus Cyclas of Lucina. 



Eichwald also mentions Z. Boissyi, Leym., as occurring in neocomien beds of Eussia; the 

 species belongs more probably to the family Venerid^, than that it should represent a Lucina. 



58-59. — L. Nicasei and Masylma are described by Coquand from the Province Constantine, 

 Algiers. 



60-65. — L. occidentalis , parvilineata, pinguis, suh-lenticularis, suhundata, and ventricosa are 

 recorded by Meek in his Check-list of North Am. cret. foss.. Smiths. Misc. Coll., No. 177, 1864. 



QQ, — L.plicatocostata, d'Orb., Voy. d. Y Am. merid., pi. 18, figs. 13-14. L. excentrica, Sow., 

 Darwin, South America, pi. 5, fig. 21. 



67-68. — L. Grangei and Bumoidini (? Desmoulini, Index to Prod„ iii, p. 89), Voy. Astrol. Pal.> 

 pi. 2, are also from South America. 



69-74. — Clissocolus dubius, Lucina nasuta, postice-radiata, subcircularis, cumulata, and ? L. cre- 

 tacea, are noted by Gabb from California (Pal. Calif., ii, p. 213). 



75-77.~— From Conrad's Check-list of eocene foss. of N. America, (Smiths. Misc. Coll., 

 No. 200, p. 6,) are to be noticed L. acutilineata, fibrosa, and gyrata, (Dosinia apud Gabb, Pal. 

 Calif, vol. i). 



78-80. — In Lynch's Exp.' report are noted by Conrad from Palsestine L. syrlaca, sub-truncata, 

 and safedensis ; the two former are imperfect casts, the third is a nearly circular, concentrically 

 lamellated Lucina. 



81-86. — In South India the following six species occur: — Lucina \_Codalda'\ percrassa, L. fallax, 

 L. nudata, L. \_Cyclas'] imiiolata, L. [_Myrtea'] Arcotina, L. \_Myrtea'] dentigera. 



All the nine species of South Indian cretaceous LuciNlD^ occur in the Arrialoor group; only 

 one is found also in the Ootatoor group, and another species is met with in all the three groups. 



As regards the representation of the whole family in cretaceous beds, there can be no doubt 

 that the number of species sensibly increases from the lower into the higher beds, and equally so 

 does the number of generic and sub-generic types. 



MUTIELLA, Stol., 1870, (see p. 247). 

 /\. MuTiELLA EXiGUA, StoUczka, PL XIII, Pig. 5. 

 M, testa ovulata, tumida,fere ceqtiilaferali, umbonibus paululum prominulis, obtu- 

 sis, incurms ; supe7]ficie concentrice rugose lamellata ; margine lunulari expanso, levis- 

 sime curvato, margine areali subrecto, modice declivi ; cai^dine in valva sinistra denti- 

 bus duobus cardinalibus lamelliformibus et unico postico laterati elongate tuber- 

 culo parvo terminanti instructo ; expansione cardinali interne obsolete rugulata 

 (? bidenticulataj , 



Height of shell : its length ... ... ... ... 0"85 



Thickness „ : „ ... ... ... _ 0'71 



The concentric lamellae are very characteristic for this comparatively small 

 species of Mutiella ; there was most probably also a fine radiating striation between 



