616 



13. CYTHEUiEA COMPRESSA (pl.cxxviii. f. 33,34), 8oicerhy,jnn. 



Cyth. testa ovali-subtrigona, albii, vel fasciis rubescentibns 

 varie radiata, crassa, Isevi, compressa ; margine ventrali subrotmi- 

 dato, prope angulum posticum subcontracto. 



Shell shaped Like C. Mactroides, but much more compressed. 

 It is nearly equilateral, and the outline of the ventral margin is 

 slightly contracted near the posterior angle. 



The variety with waved lines between the rays is from the 

 Cape of Good Hope ; this, and the specimen (fig. 33) of a general 

 brown tint, belong to Mr. Hanley. 



14. Cyther.^a nitidula (pl.cxxviii. f.25), Lamarch, Anim. 

 s. vert. no. 21. 



Cytli. " testa ovato-elliptica, laevigata, fulvo-rubente ; cingulis 

 subduabus spadiceo-maculatis ; natibus albidis." — Lamarck. 



Shell resembling the last, but deeper, larger, and more oval. 

 It is coloured by clouded reddish-brown rays, which at the sides 

 branch out into obHque lines. 



Locality uncertain. 



15. CYTHERiEA LiNEATA (pi. cxxviii. f. 26), Sowerbi/, juii. 



Cyth. testa trigona, subventricosa, sequilatera, tenui, laevigata, 

 subcinerea, postice angulatim trilineata, antice unipunctata, intiis 

 ad latera purpurea ; margine ventrali subrecto, lateribus sub- 

 rotundatis ; umbonibus parvulis, lateribus cseruleis ; lunula sub- 

 angustata ; linea impressa circumscripta. 



Shell trigonal, longer than liigh, equilateral, rather thin, 

 smooth, of a pale ashy-buff colour, with three sharply angulated 

 lines at the posterior side, and a spot at the anterior side ; both 

 sides strongly marked with purple inside. The umbones are small, 

 with little dashes of blue at the sides ; the lunule is defined. 

 This shell is related to the three or four preceding, but by the 

 above characters easily distinguished. The specimen figured, 

 from the collection of Mr. Hanley, is, as far as we know, unique. 



16. Cytheu^a Hanleyana (pi. cxxviii. f. 23, 24), Sowerb^, 

 jun. 



Cyth. testa subovali-trigona, subobhqua, inpequilatera, tenui, 

 Iffivi, pallidissimc grisea, fasciis interruptis radiatis fuscis et ad 

 latus posticum macula una distincta picta ; latere postico sub- 

 clongato ; imibonibus parvulis, cseruleis ; lunula indistincta. 



