MEGALOMASTOMA. TOMOCYCLUS. 
139 
29. Guildingianum (Cyclostoma) Pfr. I. 134. II. 85. III. 87. — 
Megalomastoma suspensum Guild., Swains. (Pfr. I. 135 not.)? — 
Megalommastoma suspensum Patel Cat. p. 120: Guatemala? — 
Habitat ? 
Quid? 
Megalomastoma lentilabrum Sow., Patel Cat. p. 120. — St. Thomas. 
XXVII. Tomocyclus Crosse & Fischer. 
„Testa perforata, turrita truncata; apertura subcircularis, 
parvula; peristoma duplex, internum breviter porrectum, ex- 
ternum late expansum, foliaceum, margine supero interrupto, 
peculiariter exciso et cavato. — Operculum circulare, corneum 
sed crassiusculum, arctispirum, antice planiusculum , postice 
medio processu obtuse rotundato munitum, margine anfractuum 
sublamelloso.“ (Cr.) 
Tomocyclus *) Crosse Fisch. in Journ. Conch. XX. 1872. p. 76. 
Tomocyclos (genus Pupineorum) Patel Catal. 1873. p. 17. 120. 
Nonne generi Megalomastomati tamquam sectio subjun- 
gendum genus? 
Species : 
i. T. Gealei Crosse & Fischer, f 
„T. perforata, turrita, truncata, solidula, parum nitida, 
olivaceo-fulvida ; spira elongata, sensim attenuata, apice trun- 
cato; sutura valde impressa; anfr. superstites 7 convexi, primi 
2 sublaeves, sequentes costulis arcuatis, subobliquis, tenuibus 
longitudinaliter ornati, ultimus basi funiculato-carinatus, Carina 
mox evanescente, solutus, descendens; apertura verticalis, sub- 
circularis, parvula; peristoma liberum, solutum, duplex: in- 
ternum breviter porrectum, externum latissime expansum, folia- 
ceum, intus concavum, album, margine supero ad perforationem 
interrupto, peculiariter exciso, in fossulam peristoma internum 
emarginantem desinente. — Long. 43, diam. maj. 12 ^ mill. 
Apertura cum peristomate externo 11 mill, longa, 14 lata, 
intus (perist. excluso) 7 mill, longa, 7 lata.“ (C.) 
') To pog , frustum resectum; r.vxXog, circulus. 
