17S PETOH : 



to two oliambors, which are more polyhedral than those of the 

 stalk. This structure is continued into the arms, but between 

 the arms the disc is reduced to one chamber in thickness. 



In large specimens the disc is about 5 cms. diara., slightly 

 concave. The mouth of the stalk is 6-8 mm. diam. ; its out- 

 line is not exactly circular", but broken by small horizontal 

 projecting teeth, one opposite every alternate division of the 

 arms : there are either eight or nine such teeth in my speci- 

 mens. Round this opening is a circular patch, about 2 ' 5 cms. 

 diam., deep red, with an irregularly toothed margin. This 

 deeply coloured area is covered with low, thin, wavy ridges, 

 which are arranged more or less in stars in the outer half , and 

 converge towards tlie projecting teeth of the mouth of the 

 stalk in the inner. The upper wall of the disc is slightly 

 thickened over this area. Elsewhere the disc is deep pink and 

 slightly radially corrugated. The purple gleba is confined to 

 this deep red area ; at first it is continuous over the opening, 

 but afterwards retracts, and forms a ring round it ; it does 

 not extend to the arms. These points were noted in Schle- 

 chtendal's original description of Aseroe Junghuhnii. He 

 says, " Stipitis orificium latius quam in aliis speciebus esse 

 videtur, margine varie lobato cingituv, et limbi regio conter- 

 mina, in qua sporarum massa conglobata et quasi coagulata 

 deposita est, rugis bullosis innatas cristulas humiles laxe 

 reticulatas oftert, procul dubio membranse sporophorae S. 

 hymenii residua." 



U;^The arms of these three large specimens are about 4 cms. 

 long. One has seventeen, and the other two have eighteen 

 each. There is no indication of an arrangement in pairs, but 

 Mr. E. E. Green informs me that he has frequently seen this 

 species in the same district' with paired'arms, and with arms 

 split for half their length. The arms^'are separated by a 

 rounded sinus : they are about 5 mm. broad at the base and 

 taper gi-adually to the tip. They are quite smooth, rounded 

 on the upper side and flattened below. The cross section is 

 semi-elliptical with the flat side downwards. A cross section 

 through the middle of an arm shows about eight chambers 

 arranged in a single ring: the number diminishes to the tip, 

 which is one-chambered. 



