238 SOLARIUM. 



noidea, aliquando orbiculari-depressa, alba, cliocolati colore vol 

 fusco-rufescente variegata, tessellata, vel radiatim et undulatini 

 strigata: nonnuuquam color brunneus, tantum super suturam 

 angustam (sed manifestam), etiamque ad peripheriam, albo est 

 articulatus. Aufractus convexi, sulcis spiralibus validis latitudine 

 variantibus, iu cingula 4 subaequalia convexa oblique creno-granosa, 

 quorum postremum pleruiuque est articulatum, et totum priumra 

 aliquando est album, divisi. Sulcus peripheric creteris tantum 

 latior. Basis subplanulata, cmgulis 6 similibus (minus autem 

 elevatis) iustructa. Cingulum amplectens umbilicum coarctatum 

 cujus porca unica valida est eminens et nodulosa, saepius album, ali- 

 quando fucatum, sajpe zona chocolated circuuiscriptum. Apex ple- 

 rumque nigricans. — Var. ? planulata. Conspicue depressa ; sulci 

 spirales lati, crenati : umbilicus patens. — Var. tessellata {Areola. 

 CAemn. p. 134, f. 1710, 1, probabiliter — Trochus a. Gmel. 3573. 

 Sol. a. Phil, in Kust. Chem. Sol. pi. 2, f. 12, 13). Strigata, 

 vel tessellata, color albus brunneum superans ; anfractuum cin- 

 gulum primum, et cingula 2 circa umbilicum alba, immaculata. 

 Obs. A very long series of specimens has induced me to unite 

 forms that at first I should scarcely have hesitated to rauk as dis- 

 tinct. The species varies greatly as to shape, breadth of sulci, 

 prominence of the belt, and diversity of colour and pattern : the 

 umbilicus is always more contracted in the Trochoid than in the 

 Kotelliform examples. In one specimen only have I descried 

 two umbilical ridges. As a general rule the depressed specimens, 

 if dark, come from the Sandwich Isles, if with much white from 

 Annaa; the latter when conoid from Borneo, the former if conoid 

 from the Society Isles : the flammular are chiefly from the Philip- 

 pines and the Red Sea. Planulata (f. 63) is perhaps distinct. 



27. bisulcatum (f. 71, 72), jyOrhigny. — T. perparva, orbi- 

 culari-discoidea, fulva, in cingulo peripheral!, et cingulo supra 

 suturam angustam distiuctam brunneo rufescente vel fulvesceute 

 articulata. Aufractus pauci, sensim aucti, cingulis 5 granosis 

 angustis instructi; quintum, fortasse, latius. Anf. ultimus cin- 

 gulis granosis 7, quorum ultima 2 sunt latiora, prrcterea ornatus: 

 intervalla satis lata (baud mere sulci), undique clathrata. Peri- 

 pheries biangulata; porcse 2 conspicue eminentes : sulcus medius 

 angustus, clathratus, vix filosus. Umbilici satis ampli crense 

 parvas et permultre; paries satis altus, haud spiraliter porcatus, 

 rude transversim corrugatus. Obs. Between dorsuosum axidijper- 

 specliviunculus. 



28. dorsuosum, (f. 73, 74), Hinds. — T. orbiculari-depressa; 



