56 
DIADEMA. COELOPOMA. 
ad peripheriam angulato et costato, basi bicostato; spira uni- 
costata, costis rugosis; perist. continue*, anfr. penultimo vix 
adnato; apertura rotundato - ovata. — Operculum corneum, 
trochleae excavatae simile, intus laevigatum. — Diam. 3% 
alt. 2 Vs mill." (P.) 
Pterocyclos ? parva Harper Pease in Amer. journ. conch. I. 1865. p. 290; 
II. t. 5. f. 8. 
— parvus (Diadema) Mart, Langlc. Don. Bismark. p. 58. 
Diadema parva Harper Pease in Amer. journ. conch. IV. 1868. p. 158. 
t. 12. f. 12. (Operculum.) 
Garrettia parva „Pease u Patel Catal. 1873. p. 124. 
— — 0. Semper in Mus. Godeffr. cat. V. 1874. p. 100. 
Habitat „Hervey Isles 44 Polynesiae (Pease), Aitutaki (Mus. 
God.) 
Obs. „Cycl. Apiae c t strigatum cum hac specie proprium forsan con- 
stituunt subgenus. “ (Pease 1865.) 
2. D. rotella Pease, f 
„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 1 / 2 , alt. 
2 mill. 44 (P.) 
Diadema rotella Harper Pease in Amer. journ. conch. IV. 1868. p. 158. 
t. 12. f. 3. 
Pterocyclos diadema-rotella Patel Catal. p. 119. 
Garrettia rotella 0. Semp. 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. 
„ Operculum olatum, conicum, concavum, corneum, lamina 
spirali cornea instructum. Testa subdiscoidea, late umbilicata; 
peristomate simplici, superne sub angulato. 44 (Ad.) 
Coelopoma (novum genus) A. Adams in Proc. Zool. Soc. 1867. p. 313. 
