176 



angulis ; areis lateralibus tenuiter et inconspicue radiatls ; area, 

 median;! glabra, : cavositas margaritacea, limbo cupreo ; margine 

 interna, crenulata. Long. 7 ; lat. 4 ; alt. 4.5 milHm. Inhabits Kago- 

 sima Lay. W. S. 



An unusually short, quadrate species, and quite distinct in charac- 

 ters, so far as a single, not very fresh specimen can be relied on. 



Modiolaria expleta. T. parvula, elongata, ovato-trapezoidalis, 

 dilute virens fusco marmorata ; umbonibus subterminalibus, acutis ; 

 extremitate antica acuta ; margine dorsali et marg. ventrali lente 

 arcuatis vix divergentibus ; extrem. postica obtusa ; valvis tumidis 

 ubique striis punctatis radiatis, ad aream medianam minus impressis ; 

 pagina interior margaritacea, marmorata ; margine interna, utrinque 

 crenulata. Long. 6 ; alt. 4 ; lat. 2 milhm. Inhabits Hong Kong 

 harbor. W. S. 



The striation of the median area is peculiar to this species, so far 

 as I know, bringing it near to M. pectinula G. 



Modiolaria varicosa. T. tenuis, compressa, ovato-trapezoida- 

 lis, dilute viridis, lineis fuscis angulatis ornata ; umbonibus terminali- 

 bus ; extremitate antica acuta, marginibus arcuatis divergentibus ; 

 extrem. postica, rotundata ; areis lateralibus striis frequentibus radi- 

 antibus impressis ; area, mediana striis concentricis vel etiam striis 

 radiantibus solum insculpta : pagina interior nacrea lineis angulatis 

 runs perlucentibus. Long. 9 ; alt. 6 ; lat. 2.5 milliin. Inhabits Syd- 

 ney, New South Wales. W. S. 



Generally resembling 31. expleta in form and coloration, but differ- 

 in" - in size and the want of stria? in the middle area. It is marked 

 like 31. strigata Hanley, a larger and less dilated shell. 



Modiolaria cuneata. T. oblique ovato-cuneata, ventricosa, 

 tenuis ; epidermide pallide virente ; umbonibus terminalibus exstanti- 

 bus decurvis ; margine dorsali cristata, arcuata, ; facie dorsali lata, 

 declivi ; angulo antico-ventrali late rotundato ; margine ventrali 

 aliquid pendente ; extrem. postica, anguste rotundata, ; areis termi- 

 nalibus radiatim sulcatis, sulcis quadratis punctatis, anticis 16, posticis 

 30 ; area, intermedia concentrice striata : pagina interior vinaceo 

 tincta vel marmorata ; margine crenulata. Long. 1 2 ; alt. et lat. 7 

 millim. Inhabits False Bay, Cape Good Hope, at low-water mark, 

 imbedded in the test of a large Ascidian, sometimes a dozen in an 

 individual ; also among rocks, 20 fathoms. W. S. 



Very similar to 31. marmorata, differing chiefly in being of a brown- 

 ish or rosy color instead of pale green ; the umbonal slope is more 

 angular, and the point more acute ; the striaj are rather more numer- 

 ous and more deeply impressed. 



M. arcuata. T. parvula, gracilis, arcuata ; margine ventrali in- 



