LIOLOPHURA. 239 



central areas densely lirate and transversely sulcated ; the lateral 

 areas elevated, radially lirate, the lirse pustulose. 



Girdle moderate, olivaceous, beset with minute scales. 



Length 40, breadth 26 mill. (H. Ad. & Ang.~) 



Rapid Bay, S. Australia ( Angas) ; Camp Cove, Port Jackson, N. 

 S. Wales (Brazier). In deep water. 



Lorica angasi H. AD. & ANG., P. Z. S. 1864, p. 193. ANGAS, 

 1865, p. 187 ; 1871, p. 97. Aulaeochiton angasi CPR., MS. 



I have not seen this species, which is here figured for the first 

 time, from drawings made by Emerton for Carpenter, who writes as 

 follows : 



" Anterior valve large ; posterior valve small, the mucro terminal, 

 much elevated, prominent ; diagonal ridges elevated ; dorsal ridge 

 acute. Interior : posterior valve a little sinuated behind, the sinus 

 wide; having two callous, subobsolete, slightly roughened ribs in place 

 of the insertion-plates. Anterior valve with 10, central valves 1 

 slit ; teeth acute, serrated outside and at the edge ; eaves prominent, 

 deeply grooved ; sinus narrow, deep ; the sutural plates separated, 

 but having a lamina between them which is sometimes bilobate or 

 denticulate. Girdle reduced one-half in width behind, and sinuated, 

 very closely beset with solid minute scales, seen under a lens to be 

 obsoletely bilobate. 



Length 32, breadth 22 mill, ; divergence 110. 



" One of Mr. Cuming's specimens is much broader and somewhat 

 tripartite. This species differs from the typical Lorica in the anterior 

 projection of the girdle ; in the minute raised scales, which under the 

 microscope look like grains of wheat set on end ; in the sinus having 

 a separate lamina, somewhat lobed ; in the absence of anterior ' false 

 apex ' on the valves ; and finally in the mucro being terminal and 

 but slightly waved, with a correspondingly slight wave in the girdle 

 behind." 



The " hairs " shown on the girdle in fig. 9 are foreign to it. 



Genus XIX. LIOLOPHURA Pilsbry, 1893. 



Liolophura PILS., The Nautilus vi, p. 105 (January, 1893). 

 Acanthopleura sp., of authors. 



Valves exposed, dull and somewhat roughened, generally eroded 

 outside, with minute eyes irregularly scattered over the lateral areas, 

 the head-valve and the sides of the central areas. Interior dark 



