CYCLOPHORID. 37 
Genus, GADINIA—Gray. 
Shell conical, muscular impression horse-shoe shaped, the right side 
shortest, terminating at the siphonal groove, which is in front of the 
right side of the muscular scar. Apex sub-central. 
G. nivea, Hutton ; Jour. de Conch, xxvi, p. 36. Irregularly oval, 
white ; with about forty sharp radiating ridges, crossed by concentric 
lines of growth. 
Length, ‘8; breadth, °7. 
Otago. 
The animal of this species has not yet been examined. 
ORDER—BRANCHIATA. 
Respiration, aerial or aquatic; larva with a conspicuous velum; 
intestine with a heemal flexure or straight. 
Sub-Order—Prosobranchiata.. 
Shelled gasteropoda, with the gills in front of the heart. Dicecious. 
DIvis1oN—NEUROBRANCHIATA. 
Terrestrial or aquatic, dicecious, operculigerous, breathing air by a 
vascular net-work on the roof of the mantle cavity, which is open in 
front ; tentacles two, non-retractile, behind, or at the base of which, are 
the eyes ; penis anterior. 
FAMILY—CYCLOPHORID. 
Eyes on the side of the head, at the outer bases of the tentacles. 
Foot elongate. Radula narrow, with seven rows of recurved, hooked 
teeth. Head, probosidiform ; tentacles subulate. Operculum distinctly 
spiral, horny. 
Genus, CYCLOPHORUS--Montfort. 
Shell globosely turbinated, depressed or discoidal, usually widely 
umbilicated ; aperture circular; peristome continuous, straight or ex- 
panded. Operculum orbicular, of many gradually enlarging whorls ; 
nucleus central. 
C. lignarius, Pfeiffer; P.Z.S., 1857, p. 112, Cyclophorus lignartus, 
Pfr. M. Pn. V., Suppl. 1, p. 44; Suppl. 2, p.64, No. 24; Reeve, f. 94. 
Shell narrowly umbilicated, turbinated, rather thin, obliquely irregularly 
striated, rufous, covered with an opaque woody epidermis ; spire conical, 
rather acute ; whorls 5~5 14, convex, the last flatter at the base ; aperture 
diagonal, ovately-rotund ; peristome double ; the outer one membran- 
aceous, narrowly expanded, excised at the adjoining whorl. — Opere. (?) 
Pfr.) 
! Diam., greatest, ‘2; least, 15; height, -16. Aperture, length, ‘r. 
GC. cytora, Gray ; P.Z.S., 1849, p. 67 ; Cat. Cycloph., p. 23, No. 
Sopa neh. Vs, ol. tp, 805 Suppl. 2. Pia 71, WVo. 12.) / Shell 
F 
