SCALIDH OF THE WEST INDIA ISLANDS. 195 
Long. 15} mm.; lat. 7 mm.; alt. aperture 5 mm. 
Scalaria denticulata, Sowb., Thes. p. 87, t. 32, f. 25-26 (non Mg.) 
Hab. Anguilla (H. Krebs); St. Thomas, St. Croix (Hornb., Swift, Riise, Krebs), 
Bahama (Riise). 
Chiefly distinguished by its beautiful decussated sculpture between the ribs, 
arising from the filiform spiral lines of various thickness, generally alternating, 
every second, third, or fifth being thicker; and the lines of growth, which are very 
thin and capillaceous. 
Sect. **, Costis undulato-dentatis. 
10, ScaLa soLuta, Dkr., n. sp., Pl. 29, fig. 5. 
T. umbilicata, candida, polita, abbreviato-turrita ; anfr. primi levigati, sutura profunda, ult. tres 
soluti; costs x in anfr. ult., lobis 4, parvis per paria digestis, posteriores 2 majores. Aper- 
tura circularis, labro lobato. 
Long. 5 mm.; diam. 25 mm. 
Scalaria soluta, Dkr., MSS. in Mus. Riise. 
Hab. St. Thomas (Krebs); Smith’s Bay (Riise). 
Scala hyalina, Sowb., Thes. fig. 21, from the Philippine Islands, is the nearest 
allied species. 
11. ScaLa ECHINATICOSTA, D’Orb. 
T. abbreviato-turrita, lactea; anfr. tres primi levigati, adnati, czeteri soluti; costa quadrilobate, 
in anfr. ult. xii. Apertura soluta, circularis, labio 4- vel 5-lobato. 
Long. 34 mm.; lat. 2 mm. 
Scalaria echinaticosta, D’Orb., Cuba, 2, p. 18, t. 11, f. 4-6. 
Hab. St. Thomas (Swift, Riise). 
Var. a. Buanpn, Pl. 29, fig. 8 
T. abbreviato-turrita, lactea, perforata; anfr. disjuncti; coste x in anfr. ult., hue illue continue, 
foliacese, vix reflexse, margine undulato-lobato. Apertura soluta, pisiformi-ovalis. 
Long. 5} mm.; diam. 2 min. 
Hab. St. Thomas (Krebs). 
The variety differs in having the suture less open, the lobes on the ribs smaller 
and more numerous; sometimes the ribs are continuous from one whorl to another. 
12. ScALA VoLUBILIS, Morch. 
T. anfr. valde discreti, costis xiii in anfr. ult. brevissimis, undulatis, vix lobatis. 
Long. 4 mm.; diam. 2 mm.,; apertura diam. 1 mm. 
Hab. St. Thomas; specimen unicum spira fracta (H. Krebs). 
Scala hyalina, Sowb., Thes. fig. 22, is very like to this species. 
