THE - CONCHOLOGISTS' - EXCHANGE 53 
SPECIES. LIVING. DEAD. VI. Rhysotina, Ancey, “Testa solida, 
Dentalium diparile, Orb Many Many | “imperforata, semi-globosa vel subdepressa, 
Cerithium muscarum. Say. . 16 | “fulva absque nitore, spiraliter impressa. Spira 
Trochus tampaensis, Con. . . 2 . , | “convexo-elevata vel convexo-conoidea, apice 
Pleurotoma Simpsoni, Dall. N.S. 2 “Jeevigata. Anfractus modice numerosi, regu- 
4 limonitella, Dall 7 “Jariter crescentes, sutura parum  profunda 
Cautharus coromandelinus, Lam. . I 
(Old and broken but very large.) 
General Results—A very large number of 
bivalves both as to species and individuals, 
and a great many young and small adult shells. 
Columbella mercatovia was not obtained atany | 
other time North of the Lower Keys. 
DESCRIPTION OF NEW GENERA 
OR SUBGENERA OF 
HELICIDA. 
BY C. F. ANCEY. 
(Continued from No. 5, page 20.) 
» V. Bertia, Ancey. ‘Testa maxima, sinis- 
“trorsa, solida, sat minute umbilicata, nitidula, 
“subtus nitida flavaque, nigro late fasciata, 
“superne brunnea. Spiro elevato fornicata, 
“slobosa obtusissima. Anfractus sat numerosi, 
“reculariter crescentes, ultimus tumidus, rotun- | 
“datus. Apertura obliqua, peristoma simplex, 
‘eacutum, ad umbilicum eversum.”’ 
Nanina Cambodgiensis, Reeve. 
Indo-China. 
Type. 
Geog. distribution. 
This very fine shell has been referred by 
some authors to Rhysota and by others to Ario- 
phanta, probably on account of its large size 
and sinistrorse shell. It widely differs from 
both. The Rhysota have a large, heavy shell, 
but the characters of the aperature and umbil- 
icus are quite distinct; while Ariophanta, 
Desm, are furnished with a thickened peri- 
stome. 
| 
| 
“separati, ultimus rotundatus, major, subtus 
“convexus et in umbilici loco depressus. Aper- 
“tura substricta, peristomate obtusato, prope 
“columellam obtuse lateque plus minusve 
‘‘dentato.” 
Types. Helix Welwitschi, Mor. and H. 
hepatizon, Gould. 
Geog. distribution. Island of Sao-Tome. 
The present series is certainly more closely 
allied to Czlatura than to any other group of 
Helices. It bears no relation to the Cananan 
group of Helix malleata, as suggested by 
several conchologists. 
VII. Sheldonia, Ancey. ‘Testa fragilis, 
“imperforata, gobosa, quasi sericatula, glabra. 
“Spira convexo-elevata, obtusa ; anfractus 
‘“minus numerosi, rapide accrescentes, ultimus 
“slobosus, antice non deflexus, maximus,margo 
“columellaris tenuissimus. Peristoma simplex 
“acutem.”” 
Types. Helix Trotteriana, Bens., H. phy- 
tostylos Bens., H. Natalensis, Pfeiffer and 
perhaps Cotyledonis, Bens. 
Geog. distribution. South Africa. 
Sheldonia resemble Cysticopis, but are ap. 
parently related to rope. 
VIII. Bermudia, Ancey. ‘‘Testa lenticu- 
“laris, solida, oblique striata, epidermide och- 
“racea induta, umbilico cylindrico preedita, 
“acute carinata, circa umbilicum angulosa. 
“‘Anfractus 5 regulariter crescentes, applanati, 
‘ultimus non antice deflexus. Apertura 
| “obliqua, peristoma simplex, acutum basi intus 
‘‘albo incrassatum, margo columellaris crassus, 
“cum basali angulum efilciens. Animal Zoni- 
“tidarum instar.” 
Type. Helix Bermudensis, Pfeiffer. 
Geog. distribution. Bermuda. 
