I8CII\. mi 55 



\'||. [00H2TORAIMSU Shuttles. 



Shell oval, as in Isehnoehiton ; irinlle covered with .-olid, n.rivex, 

 smooth scales, like those of Chiton 8. 8. 



(ion lacJiiiui'ttdfiift s. s. Median valves having several side 

 slits. Type atotro/w Sowb, 



Sretioii LepidozoiKi I'ils. Median valve- having one side; .-lit. 

 Type /. inertensii Midd. 



Subgenus I. STENOCHITON Adain.s and Angas, 18f>4. 



Stenochiton AD. AND ANG., P. Z. S. 1864, p. 193. 



Shell very much elongated, roundly arched ; valves Ischnoid, 

 the central valves havi ng several slits ; girdle having minute smooth 

 imbricating scales. 



This section was discarded by Carpenter, who referred its only 

 species to his own later group Stenoradsia with doubt ; Stenochiton, 

 however, seems to have as much individuality as most of the divis- 

 ions of Ischnochiton, and may be allowed to stand as a subgenus. 



I. JULOIDES Adams and Angas. PI. 16, figs. 6, 7, 8. 



Shell much elongated, narrow, narrower in front; rufous brown, 

 minutely spotted with white. Valves narrow, longer than wide, 

 very convex, not carinated ; lateral margins scarcely rounded, pol- 

 ished. Lateral areas elevated and at the margins concentrically 

 sulcate. Girdle narrow, pale-brown, spotted with black-brown, 

 covered with very minute, polished, imbricating scales. (Ad. and 

 Ang.) Length 25, breadth 6 mill. 



Holdfast Bay, South Australia. 



Stenochiton juloides AD. AND ANG., P. Z. S. 1864, p. ?93 ; I. c. 

 1865, p. 58, t. 11, f. 15. ANGAS, P. Z. S. 1865, p. 188. " f St* 

 adsia " juloides Ad. and Ang., CPU. MS. 



This species, from its narrow, convex form and polished surface 

 has much the general appearance of a Myriapod. (Ad. and Ang.) 



This species is the type of the genus Stenochiton Adams and 

 Angas, which is thus characterized by them: "Shell elongated, 

 narrow, convex ; valves longer than wide, not carinated; apex of 

 the posterior valve subcentral ; plates of insertion small, multi- 

 fissate in the end valves, the intermediate valves having T> li- 

 on each side; girdle covered with very minute, polished, imbrica- 

 ting scales." 



