159 



Brod. A close observation of these two Chitons showed, that 

 there are some distiuct differences between them, so tbat for 

 one of them I propose the uew name Chiton (Radsia) chierchiae. 



The length of the animal is 120 m.m., the breadth 75 m.m.; 

 the length ot the valves 110 m.m., the breadth 62 m.m. The 

 valves are so much eroded, that of the original sculpture and 

 colour hardly anything is visible. Probably the colour of the 

 valves was dark-brown or black, or black with dark-green. The 

 girdle, however, shows both white and black scales. 



The shape and form of the animal have a graat resemblance 

 to those of Chiton {Radsia) goodalli Brod.; this is also the case with 

 the shape of the valves. So I need not give au illustration of 

 the entire animal. 



The first valve is illustrated in Fig. 15; it shows very fine 

 radiating ribs in great number; unfortunately these ribs are so 

 much eroded, that only at the apex are they well visible. Very 

 strong growth-lines occur. The interior is porcellaneous and sea- 

 green with a large brown spot on both sides of the apex. 

 Twenty-two slits; the teeth are somewhat irregular and strongly 

 pectinated. 



The second valve is shown in Fig. 16. The lateral areas are 

 a little raised ; the diagonal line is distinct. The jugum shows 

 ± 12 distinct broad low ribs with very small interstices. The 

 pleurae are very finely striated. The lateral areas however do not 

 show any sculpture. The side-slopes are somewhat curved; the 

 divergence is 115°. Interior sea-green with a brown spot in the 

 middle and two brown rays. Sinus broad, having 14 (valve II) 

 or 18 (valve III) large irregular teeth. Sutural plates broad. 

 The second valve has three slits on each side, the third three on 

 the right and two on the left. 



The posterior valve (Fig. 17) shows a very small anterior and 

 a large posterior area ; the mucro is near the anterior margin, 

 the slope behind the mucro nearly straight. Sculpture of the 

 anterior area like that of the central areas of the middle valves; 

 the posterior area shows only well-developed growth-lines. Twenty- 



