620 



Japan, Dr. Sibbald. Mus. Cuming. The small variety in 

 Mr. Sowerby's collection (f. 52) is perhaps the C.graphica of 

 Lamarck. 



26. CytherjEA lusoria (pi. cxxviii. f. 40, 41, 42), Lamarck, 

 Cyth. no. 1. Var. C. fusca, Koch, Ph. Abbild. t. 3. f. 1. 



Cyth. testa C. meretrici simili, seel latere postico roagis angu- 

 lato ; margine ventrali subrecto. 



The ventral edge is straighter, and the lateral hinder angle 

 more distinct. Fig. 40 represents the typical variety, having 

 chestnut-coloured concentric bands, divided into two rays near 

 the umbones; it is in Mr. Cuming's collection, from the 

 Philippines. Pig. 41 is in Mr. Sowerby's collection, and co- 

 loured exactly as the typical variety of C. meretrix ; and fig. 42 is 

 entirely chestnut-coloured : it is front the collection of Mr. Gubba, 

 and well agrees with C. fusca, Koch. All have broad purplish 

 bands covering the posterior angle. China. 



27. Cyther^ea morphina (pi. exxix. f. 59, 60), Lamarck, 

 Aniin. s. vert. Cyth. no. 8. var. 



Cyth. testa C. meretrici simili, sed lateribus snffusis, lunula 

 magis inflata, marginibus crassioribus ; colore pallide fidvo, griseo 

 radiatim fasciato. 



Shell thicker, more spreading at the sides, with a rather 

 straighter and thicker margin and more tumid lunule than 

 C. meretrix ; no posterior purple band ; the colour pale reddish- 

 brown, with greyish rays. 



Pig. 59, China; Mus. Cuming. Pig. 60, Mus. Hanlei/. 



28. CytheRjEA Formosa (pi. exxix. f. 47), Soiverby, jun. 

 Cyth. testa C. meretrici simili, sed magis obliqua et elongatu ; 



latere postico elongatiusculo ; colore pallido, fasciis griseis suifuso, 

 prope umbones castaneo biradiato. 



This shell is thinner, more oblique, and more elongated, than 

 C. meretrix, which it otherwise greatly resembles. The hinder 

 part is coloured with grey, which is spread in concentric bands 

 towards the fore part ; there are also two broad chestnut-coloured 

 rays, commencing at the umbones, and interrupted near the centre. 



Locality unknown. Mus. Cuming. 



29. CYTHERyEA zonaria (pi. exxix. f. 53, 54), Lamarck, 

 Anim. s. vert. sp. 5. Var. C. exilis, Chemn. f. 362, 363 ? 



Cyth. testa lineis angulatis fasciatim picta, C. meretrici simili, 



