700 BET. K. BOOG WATSON ON THE 



carried across the short junction with the body by a thin nacre- 

 ous callus, "which is continued within and is, in fact, the comple- 

 tion of the whorl into a tube. Inner Up slightly thickened, 

 curved, just barely reflected. Umbilicus wide and pervious, ex- 

 posing all the whorls, and strongly cross-hatched within by the 

 spiral and longitudinal threads. Operculum very thin, clear, and 

 bright, with about eight faintly deiined turns and marked with 

 microscopic concentric lines. H. 0*64. B. 0'87, least 0"62. 

 Penultimate whorl 0-18. Mouth, height 0'43, breadth 0-4. 



This shell slightly recalls Helix ericetorum, MllU., but much 

 more closely resembles some of the West-Indian land-operculates, 

 such as Aulopoma. There is a Margarita umhilicalis, Broderip, 

 ■svhich it is like, so far as one can judge from Chenu's figure 

 "With its continuous peristome it very much recalls a Oyclostrema, 

 all the more so that it is less pearly within, less nacreous and 

 more chalky, and less globosely conoidal than Margaritas usu- 

 ally are. 



6. Teochus (Maegaeita) CHAROPUS, B^ (xapoTTos, light blue.) 



St. 149 (9). Jan. 29, 1874. Lat. 49° 16' S., long. 70° 12' E. 

 Kerguelen Islands, W. Christmas Harbour. 105 fms. 5 specimens. 



Shell. — Globosely conical, like a Ct/clop7iortis, thin, translucent, 

 umbilicated, iridescent, banded, spirally studded with irregular 

 interrupted, long, narrow, sharp tubercles. Sctolpture. Of spiral 

 threads there are from twenty-five to thirty-five, sharply projecting, 

 rounded, and fine on the last whorl; of these, from three to seven are 

 feebler than the rest ; those on the base are continued within the 

 mouth. The interstices are much broader tlian the threads. The 

 whole surface is also fretted by microscopic spirals and stronger 

 longitudinals which follow the oblique lines of growth. Of the 

 threads, six to thirteen appear on the penultimate whorl ; they begin 

 with the second whorl, and there the longitudinals are rather 

 disproportionately strong and regular. The embryonic apex is 

 faintly but coarsely tubercled. Colour yellowish white, shot on 

 the upperside with a dark iridescence ; the spirals are black, 

 clouded, and broken with oblique longitudinal sti'eaks of white. 

 The spire is high and turreted. The apex, porcellanous and scarcely 

 iridescent, is small , high and mammillate, and consists of the one em- 

 bryonic whorl, which is a little turned up on its side. Whorls 6, 

 of gradual and regular increase, rounded, near the apex a little an- 

 gulated by one of the spirals. Suture well marked, angulated^ 



