BIHANG TILL K. SV. VET.-AKAI). HANDL. BAND 13. A1'D. IV. N:0 5. 75 



4. EcHiNu.s Gratilla L. 



p]cHiNUS hemisphsericus, gibbus, ambulacris denis tri- 

 plicatis, areis decussatim nuiricatis, basi decem- 

 fissis. 



S. N. ed. 10 et 12. 



Habitaf in Oceano Indico. 



Testa liemispheerica, sed magis gibba, basi decem 



fissnris n otäta. 

 Ambulacra 10, singula muricata et porösa serie tri- 



plici; in singula serie gemina longitudinali pertusa. 

 AREOLyi': 5 latiores, ad latera magis longitudinaliter 



muricatae, in medio Iceviores. 

 Areol^ 5 anffusfiores latioribus dimidio tantum angn- 



stiores et similiter muricata\ 



One of tbc MS Lcctiires lias thc word »triplicatis» explaincd 

 tlius: »divided iuto three parts , and as tlie final term of tlie 

 diagnosis: »basi decemfissis>, words answering to the »nec 10 

 fissnris notata: of thc E. escnlentns, bnt omitted in all tlie pu- 

 blished diagnoses. The term vdecussatim» is explained: »in 

 quincuncem Plinii >. 



The specimen Linn.eus had before him exists no moro in 

 the collcction, and appears to have been löst before the time 

 of SwARTZ, but the want of it is little felt since the general 

 form, the geminous pores disposed in three longitudiual rows, 

 and the ten deep linear fissures ') of the peristome, leave no 



') Folium fissum est divisum siuubus linearibus marginibusque reclLs. 

 Phil. Bot., ed. Holm., 1751, p. 43. 



