176 



angulis ; areis lateralibus tonuitcr et inconspicue radiatis ; are:! 

 medians glabra: cavositas margaritacea, limbo cupreo; margine 

 LnternS crenulata. Long. 7; lat. I ; alt. 4.5 millim. Inhabits Kago- 

 sima Bay. W. S. 



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

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



Modiolaria i.xri.KTA. 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. posticil obtusfi ; 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 millim. 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. pecti?iula G. 



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

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

 bus; extremitate antica acuta, marginibus arcuatis divergentibus; 

 extrem. postiea rotundata ; areis lateralibus striis frequentibus radi- 

 antibus impressis; area medians striis coucentricis vel etiam striis 

 radiantibus solum insculpta : pagina interior nacrea lineis angulatis 

 runs perlucentibus. Long. 9; alt. G; lat. 2.5 millim. Inhabits Syd- 

 ney. New South Wales. W. S. 



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

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

 like M. 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. postiea 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. 12; 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 .1/. 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 stria? are rather more numer- 

 ous and more deeply impressed. 



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



