POLYPLACOPHORA. 97 



areas smooth, rugulosely granulated at the sides. Marginal ligament 

 rufous, beset with saffron colored setae. Length 59, width 44 mill. 

 (Rochebr. in Bull. Soc. Philom. 1881-'82, p. 192). 



Cape of Good Hope (Verreaux) ; Madagascar (Cloue). Not 

 common. Mus. Paris. 



GYMNOPLAX ANAGLYPTUS Rochebr. Shell ovate, subcom- 

 plauate; olivaceous, painted with brown striae. Anterior valve, 

 posterior part of the posterior valve, and lateral areas corrugated. 

 Central areas minutely sulcated at the base, the sulci incurved; at 

 apices very delicately (" mollissime") striated. Marginal ligament 

 rather wide, bluish-gray (" schistaceo"). Length 15, width 10 mill. 

 (Rochebr. in Bull. Soc. Philom. Paris, 1883-84, p. 33). 



Cape Good Hope. Rare. Mus. Paris. 



GYMNOPLAX MELANOTREPHUS Rochebr. Shell ovate, subcarin- 

 ate, intense chestnut colored. Anterior valve, posterior part of the 

 posterior valve and lateral areas of the intermediate valves radially 

 lyrate, the lyrse acute, obtusely dentate. Central areas very subtly 

 rugose. Marginal ligament rather wide, chestnut colored, regularly 

 begirt with square orange spots. Length 15, breadth 10 mill. 

 (Rochebrune, in Bull. Soc. Philom. 1883-'84, p. 34). 



Cape of Good Hope. Rare. Paris Museum. 



4. Species from the Red Sea. 



ACANTIIOPL.EURA VAILLANTII Rochebr. Shell ovate elongate, 

 wide; whitish painted with olivaceous spots. Anterior valve and 

 posterior part of posterior valve granulose, and having scattered 

 conic tubercles. Intermediate valves having the lateral areas covered 

 with elongated black tubercles ; central areas rugulose in the middle, 

 anteriorly tuberculate. Marginal ligament wide, bearing whitish 

 and green subelongated, conical spines. Length 43, width 32 mill. 

 (Rochebr., Bull. Soc. Philom. 1881-*S2, p. 192). 



Suez Canal (L. Vaillant). Quite common. Paris Mus~ 



TONICIA PTYGMATA Rochebrune. Shell subelongate, much 

 elevated, obtusely carinated ; whitish with pale chestnut spots and 

 tawny lines ; anterior valve radially striated ; lateral areas and pos- 

 terior area of tail valve strongly and deeply corrugated ; central 

 areas sculptured with lamellose and undulating sulci. Marginal 

 ligament narrow, corneous, rufous. Length 21, breadth 13 mill. 

 (Rochebr. in Bull. Soc. Philom. de Paris 1883-1884, p. 33). 



Red Sea (M. Botta) ; Paris Museum. 

 7 



