BIHANG TILL K. SV. A-ET.-AKAD. HANDL. BAND 13. AFD. IV. N:0 5. 139 



and in tlie M. L. U., of 1764, »hemisplijcrico-depressiis» iö siib- 

 stituted for »globoso-depressus». In the M. L. U. the word 

 »linearibiis» is omitted, and in the S. N. ed. 10 and 12 the 

 last words are mutilated, tlnis: »alternatim bifariis», and in 

 the F. S. ed. 2, of 1761, thus: »alternis bifariis». 



The Lectures liave: »is called Cidaris and comes from 

 the East Indies). In the S. N. ed. 10 and 12 the habitat is: 

 »in Oceano \ in the F. S. ed. 2 : »in Oceano norvenico». 



Tliere is no description. 



The two specimens of the genus Cidaris in the Drott- 

 ninpholni collection, both dcnuded, belono- to widelv different 

 species. One of them onlv, Tab. />, fig. 1, 2, answers to the 

 Linnean »globoso-depressvis>, and is therefore to be regarded 

 as the type of the primitive description afterv^-ards suppressed. 



It may be thus deseribed : 



Testa globosa, ambitu sub-pentagono, inferne tumidior, 

 rertice depressa, altitudine 0,7.5 diametri lequante. 



Calyx rotundato pentagonus; eostalia depressione trans- 

 versa notata, granulata, granulis ad marginem aboralera et ad 

 latera pori majoribus; pori sexiiales, in 1, 5, 4, o, ad tertiam 

 partem terminalem, in 2 ad (juintam siti, miniitiuseiili, snh- 

 tubulosi. Radialia lata, triangularia, superne truucata, inferne 

 emarginata; granvilata ut eostalia. 



Ambulacha nonnihil impressa, prope ambitum 11,2 mm. 

 lata, 0,2",) interradii latitudine sequantia, lanceolata, levis- 

 sime fiexuosa, juxta ambitnm fere strieta et linearia. Areohi 

 media, in III, juxta 2b7, 5,2 mm. lata, 0,4 04 amhulaeri lati- 

 tudine jequans. serie utrinque marginata eontinua verrucula- 

 rum primordialium, quarum in assula qiiivis una, additis prope 

 ambitum minoribus: proxima ad marginem adoralem, altera 

 sub-media, tertia adorali, quarta sub-sutvxrali^). 



Intejjhadia tiimida, o8,.-i lata; areola media aperta, O,:-, 

 toti, ad summum perdneta planiuscnla, superne levissime tan- 

 tum ad sutnram impressa; areola lateralis utrinque dimidio 

 fere ano-iistior. Yerruea^ in hoc oenere exioiue masnitudinis 

 et numerosae, 11,. t et 12; serobieuli duo ultimo fere circidarcs. 

 reliqui transversim sub-elliptiei, supra et infra invieem eon- 

 tigui; verrucuhe annulorum minuscuhe, conferta^; siiperiores 

 et inferiores exigufe quatiior 1. quinque serie simplici alterna, 



') See woodcut below, p. 141!. 



