SCALARIA.— Plate XVI. 



Species 1-25. OIus. Nobis.) 



Sc.\LARi.4 MbRCim. Sea. testa parvd, alh'ulA, angustd, 

 spiraliter dense striata; anfractibus mmerosis, 

 iente crescentibus ; varicibus creberrhnis, crassius- 

 culis, ad suivram paulo expansis. 



MiJRCH's ScALARiA. Shell small, whitish, narrow, 

 spirally closely striated ; whorls uunierous, slowly 

 increasing; varices very close, rather thick, a 

 little exi>anded at the suture. 



Angas. ? 



Hub. 



Species 124. (Mus. Barclay.) 

 ScALARiA ABBREVIATA. Sctt. testd brevi, cmssa, sub- 

 caaniled, imperforatd, spiraliter sulcata, costis 

 planulatis, undulatis, uno latere angidatim laqueatis, 

 ad suturam aculeatis, ad carinam inferioreni 

 prominentibus ornatd ; interstitiis ad suturam et ad 

 carinam profunde foveolatis ; anfractibus 2micis, 

 stipcriic subdeclivis; ultimo anfractu infrd carinato, 

 admarginem aperturce incrassato ; varicibvs 7iiagnis, 

 crassis, crenulatis, perpaucis ; aperturdsiihrolundd, 

 margine crasso, crenato. 

 The abbreviated Scalaria. Shell short, thick, 

 bluish, imperforate, spirally grooved, ornamented 

 with flattened, undulated ribs, angularly fluted on 

 one side, aculeated at the suture, prominent at the 

 lower keel ; interstices deeply sloped above ; last 

 whorl keeled below, thickened at the edge of the 

 aperture; varices large, thick, crenulated, very 

 few ; aperture rather round, margin thick, 

 crenated. 



SOWERBY. 



Hab. Tamarind Bay, near Black River, Mauritius. 



This is figured in Thesaurus as a variety of Scalaria 

 varicosa, from which subsequent examination compels 

 me now to distinguish it. 



Species 12.J. (Mus. Sir D. Barclay.) 

 Scalaria :*iultiperforata. Sea. testd pallid!: fulvd, 

 acuminata, costis latis, decumbentibus, undulatis, 

 uno latere angulatim laqueatis sculptd ; interstitiis, 

 L-oiiriiiiic Joreolatis ; anfractibus compressis, ad 

 silt II nun riiiiiiliculatis, aculcis elevatis coronatis ; 

 vltiiiiii aifnirtii infrd carinato, ad carinam foveolato ; 

 varicibus pierpaucis, irregularibus, crassis, pro- 

 minentibus, ad suturam elevatis, productis. 

 The many-holed Scalaria. Shell pale, fulvous, acu- 

 minated, sculptured with broad, decumbent, undu- 

 lated ribs, angularly fluted on one side ; interstices 

 neatly pitted; whorls compressed, channelled at 

 the suture, crowned with raised points; last 

 whorl keeled below, pitted at the keel ; varices 

 very few, irregular, thick, prominent, raised and 

 produced at the suture. 

 Sowerby. 

 IJab. Black River Bay, ^Mauritius. 



The sculpture of this little shell is e.xquisite. the 

 flattened ribs being fringed on one side with an angular 

 fluting which leaves little distinct perforations against 

 the back of the adjoining rib. There is au obsolete 

 tendency to the same arrangement of sculpture in 

 Scalaria varicosa and S. abbreviata, which belong to the 

 same group, but are not nearly so narrow and acumi- 

 nated, and have not the whorls so laterally compressed. 



(Fig. 9, h, PI. II. Mus. Sir D. Barclay.) 

 Scalaria rariscost.\ta. This exquisite specimen was 

 dredged by Sir David Barclay, Bart., oflf Round 

 Island, Mauritius. The ordinary specimens give 

 no idea of the beautiful sculpture wliich belongs 

 to the shell when in perfect condition. Besides 

 the four larger ribs which in this specimen are 

 crowded in the last whorl, the whole shell is 

 sculjitured with fringed and aculeated lesser varices. 



