SAINT HELENA. 553 



its basal whorl immediately above the latter, affiliating it with 

 the various forms which cluster around the S. striatella, Eang, 

 and the octona, Chemn., and bespeaking also a certain affinity 

 with the equally St.-Helenian (but, at the same time, still re- 

 cent) S. melanioides, Woll. 



The S. terebellum, which has been found in the cutting of 

 the Sidepath Koad, above the Briars, between Jamestown and 

 Longwood, at an elevation of some 1200 feet above the sea, is 

 rather conico-fusiform in outline, and composed of about six 

 whorls which are so much flattened as to cause the suture to 

 appear but very slightly sunken or impressed ; its columella is 

 not sinuated (as in the S. melanioides), or posteriorly subtrun- 

 cate, but rounded-off uniformly and gradually into the lower 

 margin of the peristome ; and its surface (at any rate in a sub- 

 fossil condition, and probably in statu normali equally) is 

 almost free from sculpture. Its extreme length would seem to 

 be about 81 lines. 



Genus 7. STENOGYRA, Shuttl. 



Stenogyra compressilabris. 



Bulimus compressilabris, Benson, Ann. Nat. Hist, xviii. 



434 (1856) 

 Pfeiff., Mon. Hel. iv. 461 (1859) 



Habitat in horto publico ad Jamestown ; in aquseducto quo- 

 dam parvulo a cl. E. L. Layard olim reperta. 



The present Stenogyra, which I did not myself meet with 

 during our sojourn at St. Helena, appears to have been found 

 by Mr. E. L. Layard (while halting there for a short time on 

 his passage to the Cape of Good Hope) in a small artificial 

 watercourse in the public garden at the entrance to Jamestown. 

 In all probability, therefore, it is a species which has been natu- 

 ralized in the island. It seems to be white and subuliform, 

 composed of about seven volutions, and closely sculptured with 

 flexuose costate-striae ; and Mr. Benson adds ' This is a form of 

 the widely-spread type to which Bulimus Goodallii, octona, 

 &c., belong.' His diagnosis of it is as follows : ' Testa vix per- 

 forata, subuliformis, confertim flexuose costulato-striata, cerea, 

 albida, sutura subimpressa apice obtusiusculo ; anfractibus 

 vix 7, ultimo -f- longitudinis sequante ; apertura truncato-ovali, 

 basi rotundata ; peristomate tenui, simplici, margine dextro 

 superne antrorsum arcuatim producto, subcompresso, columellari 

 verticali, breviter reflexo, subtus nullo modo truncate nee emar- 

 ginato. Long. 6^ ; diam. 2 mill? 



