OF SOUTHEEN INDIA. 253 



40. — L. Tnroniensis is eitlier a Mi/sia or a Lucina. 



41-45. — h. Nereis, sub-pisiim, Ca)n.paniensis, Michelini, Harlei are apparently Lucina. 



\L. lenticularis, Goldf., is one of the typical species of Eriplii/la, Gabb, vide p. 156], 



46-52. — L. producta, lohata, sul-numismalis, 1850 {^= tenuis, Miiller, Petraef. Aach. Kreid., 

 pt. \\, 1851, p. 66), Geiyiiizi, cretacea, (vide Favre, Descrip. M. foss. de Lemberg, 1869, p. 115), 

 sub-squamulata and snpra-cretacea, all appear to be true Lucina. 



53-56. — L.in(equaUs,corbisoitles, Phillipsiana, and FiscZ/eriona, d'Orb., (Eichwald, Leth. ross., 

 xi livi-., 1867, p. 61.8, and Murchison, Ver. and Keys. Pal. d. Russ., pi. 39, figs. 1-S, and pi. 38, 

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



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



Eichwald also mentions i. Uoissyi, Leym., as oceuri-ing in neocomien beds of Russia; the 

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



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

 Algiers. 



60-65. — L. occidentalis, parvilineata, pinguis, sub-Ieiificularis, subundafn, and ventricosa are 

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



66. — L.plicatocustafa, d'Orb., Voy. d. F Am. merid., pi. 18, figs. 13-14. L. excentrica. Sow., 

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



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

 pi. 2, are also from South America. 



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

 tacea, are noted by Gabb from California (Pal. Calif., ii, p. 243). 



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

 No. 200, p. 6,) are to l^e noticed L. acutUineata, fibrosa, and gyrata, (Dosinia apud Gabb, I'al. 

 Calif, vol. i). 



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

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

 lamellated Lucina. 



81-86. — In South India the following six species occur: — Lucina [Codai-ia'] percrassa, L.fallax, 

 L. nudata, L. \Cyclas'\ taniolafa, L. [Myrfea] Arcotina, L. \_Myrtea'] dentigera. 



All the nine species of South Indian cretaceous LvciMD^E 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. 2-i7). 



1. MuTiELLA EXIGUA, StoUczha, PI. XIII, Pig. 5, 



31. testa ovulata, tumida, fere ceqtiilat.erali, tmibonihus 'paululum prominulis, obtii- 

 sis, incurvis ; supe7'Jicie concentrice rugose lamellata ; margine lunulari expcmso, levis- 

 s'lme curvato, margine areali subrecto, modice declivi ; car dine in valva sinistra denti- 

 hus duobns cardinalibus kmielliformibus et unico postico laterali elongato tuber- 

 cnlo paroo terminanti instructo ; expansione cardinali interne obsolete rugulata 

 ( f bidenticulata) . 



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



Thickness „ : „ ... ... ... ... 071 



The concentric lamellae are very characteristic for this comparatively small 

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



