192 A DESCRIPTIVE CATALOGUE OF THE 
G. B. Sowerby, Jun., in the “Thesaurus Conchyliorum,” 1844, Part IV., con- 
taining ninety-four species, indicates ten species from the West Indies, of which 
eight are new. 
In the present paper are enumerated forty species, of which eighteen are new 
and three for the first time identified as West Indian. 
Synopsis Familie Scalidarum Indiarum occidentalium. 
Fam. SCALID/. 
Gen. Scara, Klein (Scalaria, Lam.). 
Sect. *. Aciona, Leach. 
1. ScALA KREBSII, Morch, n. sp., Pl. 29, figs. 1 and 2. 
T. umbilicata, ovata, polita, striis spiralibus aciculatis irregularibus; strize incrementi obso- 
letissimee ; anfr. disjuncti ad suturam angulato-plani, convexi; coste x in anfr. ult. ad 
suturum aurite: apertura subcircularis, labio subreflexo. Color albus, in media parte anfr. 
pallide ferrugineus. 
Long. 17 mm.; lat. 105 mm.; alt. aperture 6 mm. 
Analogue of Scala subpretiosa, Bly. (Sc. pallasii, Kien.) Sowb. Thes. Conch. 
1844, fig. 14; but the new species is much smaller. 
Hab. St. Thomas “60' bl. S. Mud.” H. Krebs (fig. 1), St. Martin, spm, juvenile 
(H. Krebs, fig. 2). 
2. SCALA PRETIOSULA, Mérch, n. sp. 
T. perforata, oblongo-ovata, lactea, politissima; striz incrementi argute, obsoletissimee ; anfr. 
omnino disjuncti, sutura hiante; coste viii in anfr. ult. compresse, candid, foliaceze, obso- 
letissime crispatze, suturam versus expanse cost 6 ult. antecedenti oblique adnate, ceterz 
continu; apertura ovalis (sed. fracta in spm.). 
Long. 114 mm.; lat. 6; mm.; alt. apertura 4 mm. 
Hab. St. Martin (H. Krebs), two specimens; the smallest is 6 mm. long and 
4 mm. broad. 
Scala fasciats, Sowb., most nearly resembles this species. The whorls are com- 
pletely separated, rendering the umbilicus visible through the sutural opening. 
The ribs are foliaceously dilated at the suture, touching the corresponding rib of 
the preceding whorl, but the last six ribs obliquely, giving the appearance of 
being alternate. 
