0 P ISTHOP ORU S . 
41 
VIII. Opisthoporiis Henson. 
Pfr. Mon. Pneum. II. p. 25; III. p. 36. — Blanforcl in 
Ann. and Mag. nat. hist. 3d. ser. XIII. 1864. p. 451. — 
Martens Ostas. Zool. II. 1867. p. 110. * — Stoliczkd in Journ. 
As. Soc. Beng. XLI. 1872. Pt. 2. p. 265. — Patel Catal. 
1873. p. 16. 119. 
Species : 
1. biciliatus (Pterocyclos) Mouss. (Coll. 1.) I. 40 ( Cydotus Tay- 
lorianus). 50 (Pterocyclos). II. 26. III. 36. — Martens Ostas. Zool. 
II. p. 110*). — Patel Cat. p. 119. — Issel Moll. Born. p. 73 
(injuncto sequente). — Cydostoma Taylorianum Pfr., ; Charbonnieri 
Red. ,-ff Borneo. 
2. ? 0. spiniferus (Cyclostoma) Morelet. f 
„T. latissime umbilicata, depressa, striatula, albido-fulva, 
flammulis castaneis, zigzagformibus, subtus pallidioribus, varie- 
gata, spira planulata, medio prominula; anfr. 4*/ 2 sutura pro- 
funda discreti, priores fusco-violacei, convexiusculi , ultimus 
supra peripheriam angulatus , obsolete plicato - striatus , antice 
vix descend ens, spina tubulari albida, recurvata, juxta suturam, 
9 mill, pone aperturam munitus; apertura obliqua, circularis, 
intus variegata; peristoma duplex: internum rectum, continuum, 
prominens; externum albidum, expansum, margine dextro di- 
latato, superne angulatim patente. — Operculum subcartilagi- 
neum, pallidum, multispirum, oblique lamelloso-striatum, extus 
concaviusculum ; nucleo centrali, nitide corneo. — Diam. 17, 
altit. 5y 2 mill. 44 (M.) 
Cydostoma spiniferum Morelet in Journ. Conch. IX. 1861. p. 177. 
Opisthoporus spiniferus Mart. Ostas. Zool. II. p. 113. 
*) „Testa depressa, late umbilicata, perpendiculariter confertim rugosa, 
seriebus 2 spiralibus ciliorum sat longorum, mollium ornata, virenti-brunnea, 
maculis fuscis latis plus minusve fulgurantibus picta; vertex castaneus pau- 
lum prominulus; anfr. 4 1 / 2 , convexi, sutura sat profunda, ultimus ad apertu- 
ram descendens, paulo antea tubulo suturali recurvo aperto munitus; apertura 
sat obliqua, circularis; peristoma reflexum, dilatatum, callo junctum, pallide 
flavum, subduplicatum , externum ad suturam sinuatum et effusum. — Oper- 
culum calcareum, multispirum, extus planiusculum, albidum, nucleo nigri- 
cante. — Diam. maj. 14 — 19, min. 10 — 14, alt. apert. long. = lat. 
• 61 / 2 — 8V 2 mill.* 
