OF CONCHOLOGY. 91 



DESCRIPTIONS OF MARINE GASTEROFODiE, INHABITING 

 POLYNESIA. 



BY WM. HARPER PEASE. 

 [Continued from page 80} 



Collonia maculosa, Pease. — Plate 11, fig. 1. 



(Eiichelus maculosa. Proc. Zool. Soc. London, 1862.) 



Description. — T. parva, globosa, umbilicata, nitida, tenuiscula, 

 concentrice irregulariter costata, interstitiis sulcatis, concavis, 

 transversim subtilissime striata ; alba, costis maculis roseis, dis- 

 tantibus maculatis. 



Dimensions. — Diam. 2, alt. If mill. 



Sab. — Paumotus. 



Shell small, globose, umbilicate, rather thin, shining, concen- 

 trically irregularly ribbed, interstices grooved, concave, trans- 

 versely very finely striate ; white, ribs spotted remotely with 

 rose red. 



Remarks. — This little gem, from examination of its operculum, 

 proves to belong to the above genus. All the species of Collonia 

 as yet discovered in Polynesia are umbilicate, with the exception 

 of 0. rubrocincta, Migh. 



Collonia picta, Pease. — Plate 11, figs. 2, 3. 



Description. — T. parva, solidissima, globosa, umbilicata, con- 

 centrice costata ; spira vix exserta ; anfr. supra angulatis ; aper- 

 tura circularis ; columella vix callosa ; albida, superne rufo-ca&- 

 tanea longitudinaliter strigata, infra maculata. 



Dimensions. — Diam. 3, alt. 3 mill. 



Hob. — Paumotus. 



Shell small, solid, globose, umbilicate, concentrically ribbed ; 



