1884.] OF THE 'CHALLENGER' EXPEDITION. 277 



believe, been previously recorded from this island. The other species 

 are : — Helix bermudensis, Pfeiffer ; H. circumfirmata, Redfield ; H. 

 microdonta, Deshayes ; H. vortex, Pfeiffer ; Bulimus ventrosus, 

 Ferussac ; Succinea bermudensis, Pfeiffer ; Helicina convexa, Pfeiffer; 

 Melampus gundlachi, Pfeiffer. 



St. Thomas, "West Indies. 



The forms obtained at this island are unimportant and none are 

 restricted to it in their distribution, being met with in other islands 

 of the West-Indian group. 



1. Bulimulus exilis, Gmelin. 



This species is not restricted to this island, but has also been 

 reported from Guadeloupe, Dominica, Barbuda, and Cayenne. 



2. Stenogyra (Subulina) octona, Chemnitz. 



3. Helicina subftjsca, Menke. 



The two specimens under examination approach, although they 

 are not quite so dark in colour, the variety /3 of Pfeiffer (Monogr. 

 Pneumon. p. 35). It appears to have been found on other islands 

 besides St. Thomas. 



4. Megalomastoma antillarum, Sowerby. 



Other localities whence this species it said to have been obtained 

 are the islands of St. Vincent and Tortola. 



5. Physa rivalis, Maton & Rackett. 



A few small specimens from this locality apparently belong to 

 this species. The shell figured by Sowerby (Conch. Icon. vol. xix. 

 fig. 31) is very unlike the drawing, and probably is specifically 

 distinct from P. rivalis. The authorship of this species is erro- 

 neously attributed by Sowerby (I. c.) to his father, whose figure does 

 not at all coincide with that in the ' Conchologia Iconica,' and who 

 moreover rightly gives a West-Indian locality. 



6. Hydrobia auberiana, d'Orbigny. 



This species, described in Sagra's • Histoire &c. de l'lsle de Cuba ' 

 (vol. ii. p. 8, pi. 7. f- 6-7) as a Paludcstrina, has a very thin semi- 

 transparent operculum of a roundly ovate form but rather pointed 

 above. It is also found on the island of St. Croix. 



Kerguelen and Prince Edward's Island. 



Helix (Patula) hookeri of Reeve, the only land-shell at present 

 known from Kerguelen, has not hitherto been recorded from the 

 latter of the above localities. The specimens from Marion Islands 

 are remarkable in being radiately striped with red, but, with the 

 exception of this slight difference, correspond precisely with normal 

 examples of the species. 



