BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 13. AFD. IV. N:0 5. 155 



placed tlie dcscription of the Xo 10 under the No 9, and at 

 the same time took care, by way of ememdation, to alter the 

 beginning word: »praecedenti» into »E. diademati», the trivial 

 name then newly given to the No 8. 



The absurd eomparison with the E. Diaderaa, which was 

 in this way, I suspect, smuggied in, could not but throw irre- 

 mediable confusion över the whole description, destined as 

 this was, not to elucidate the characters of the E. mamillatus, 

 but, as will be seen, to point out their very contrasts. For all 

 comes right when the description under the No 9 in the M. L. U. 

 is transTerred to the No 10, and its first words restored to : 

 T. praecedenti simillima. Then it is found that Linn^eds says 

 of the E. Lucunter: that it is very like the E. mamillatus, 

 but distinguished by its verrucae which are quadruply smal- 

 ler)^, — the areae of tlieir scrobicular circles are respectively 

 as 1 to 3,24 — and have their »basis>^, that is the rather 

 broad scrobicuhi, to a great extent nearly flat and not rising 

 conically directly from the circle as in that species. Fur- 

 thermore, lie says, the »ambulacra», that is the poriferous 

 zones, on the under side have their pores disposed in such a 

 manner as to form a repand or slightly sinuovis outline ^), and 

 to be intercepted between »puncta», that is minute secondary 

 verruculae. He then once more insists on the character of 

 the »tubercles» of the areolte being »longitudinal>\ that is: ar- 

 ranged in rows coutinuous from the peristome to the top, and 

 regularly bordering upon the zome, the very opposite of what 

 is seen in the E. mamillatus, whose rows of ambulacral tu- 

 bercles are abridged: consisting of true verrucae from the peri- 

 stome to above the ambitus, but then of a sudden reduced to verru- 

 culae. Lastly he states that the colour is white, presenting 

 hardlv a trace of the l)rown tino-es of the E. mamillatus, 

 which strikingly illustrates the colouring of either species as 

 they generally occur in old collections. 



It is seen how nicely the characters of the E. Lucunter 

 are indicated, so pointedly indeed as almost to permit us to 

 reconstrue, by contrast, the löst description of the E. mamil- 

 latus. How this came to disappear perhaps not even the care- 

 less copyist himself was able to explain. 



') Pbilosophia botanica, p. 42, foUum repandum, fig. 29. Comparc 

 aJso my Etudes, t. XVIII. fig. 157. 



