56 DIADEMA. COELOPOMA. 
ad peripheriam angulato et costato, basi bicostato; spira uni- 
costata, costis rugOSls; perist. continuo, anfr. penultimo vix 
adnato; apertura rotundato-ovata. —  Operculum corneum, 
trochleae excavatae simile, intus laevigatum. — Diam. 3!/5, 
alt. 2!/, mill.* (P.) 
Pterocyclos? parva Harper Pease in. Amer. journ. conch. I. 1865. p. 290; 
LIS dE SNME-N8? 
— parvus (Diadema) Mart. & Langk. Don. Bismark. p. 58. 
Diadema parva Harper Pease in Amer. journ. conch. IV. 1868. p. 158. 
t. 12. f. 12. (Operculum.) 
Garrettia parva ,Pease* Pütel Catal. 1873. p. 124. 
— . OQ. Semper in Mus. Godeffr. cat. V. 1874. p. 100. 
Habitat »Hervey Isles* Polynesiae (Pease), Aitutaki (Mus. 
God.) 
Obs. ,Cycl. Apiae et strigatum cum hae specie proprium forsan con- 
stituunt subgenus.* (Pease 1865.) 
2. D. rotella Pease. 1 
T. turbinata, solida, umbilicata, laevigata; spira elevata; 
anfr. 4, rotundato-convexis, ultimo ad peripheriam rotundato; 
sutura bene impressa; perist. vix adnatum; pallide spadicea, 
ad peripheriam fascia alba cingulata. — Diam. 2!/,, alt. 
2omnillse" (4) 
Diadema rotella Harper Pease in Amer. journ. conch. IV. 1868. p. 158. 
ilo us. 
Pterocyclos diadema-rotella. Pütel Catal. p. 119. 
Garrellia rotella O. SSemp. in Mus. Godeffr. cat. V. p. 100. 
Habitat in insula Atiu Polynesiae. 
* 
3. biangulata (Garrettia) Pease in Mus. Godeffr. cat. V. p. 100. — 
Ins. Aitutaki (Nomen.) 
XV. Coelopoma A. Adams. 
, Opereulum elatum, conicum, concavum, corneum, lamina 
spirali cornea instructum. Testa subdiscoidea, late umbilicata; 
peristomate simplici, superne subangulato.* (Ad.) 
Coelopoma (novum genus) 4. Adams in Proc. Zool. Soc. 1867. p. 313. 
