STAUROCALYPTÜS TUBüLOSUS. 1// 



geneniUy tulinlar shape and the peculiarly liairy character of the 

 gastral surtace. Certainly these features have yet to be shown 

 to be constant before they can be finally accepted as specific 

 differential characters. However they seem to me to l)e not 

 unmi portant when taken into consideration conjointly with certain 

 points in tlie spiculation in which the present species stands in 

 disagreement with S. dowlingi. 



Spiculation. 



The principrd parenclnjmaUa are oxydiactins which not in- 

 frequently attain a length of 12 mm. and a breadth of 130 /^ in 

 the middle. Generally, however, they are much smaller, being 

 under 10 mm. in length. The ends are finely attenuated and 

 smooth-surfaced. Compared with S. doivlingi, the parenchymalia 

 of tlie present species are on tlie whole considerably coarser. (In 

 S. dowlingi the maximum dimensions of parenchymalia, in speci- 

 mens very nuich larger than the type of S. t/ibulosus, are known 

 to be length 8 mm. and breadth 41 /^). 



The oxydiactinic prostalia may attain 20 mm. or more in 

 total length and 95 // in greatest breadth. (In iS. dowlijigi 60 

 mm. l)y 800/^). 



The oxg pentad hiic prostalia are generally small, inconspicuous 

 and usually isolated, but sometimes stand out in small loose groups. 

 The pai'atangentials are either paratropal or nearly regularly 

 cruciate. Their length rarely reaches 4 mm.; more generally they 

 are much shorter (under 2 mm.). In the prostalia situated close 



