ANIMAL OF NASSA. iL 7 
Animal and Opereculum of Nassa arcularia, Linn. 
ANIMAL OF NASSA. 
Head rather broad, often lunate, with pointed corners ; eyes 
placed on stalks, either at the base or at various distances up to one- 
third from the tips of the tentacles. ‘Inthe Nassa reticulata, Linn., 
the mouth is a vertical fissure under the head, from which a very 
long proboscis is protruded, the structure of which is in all respects 
similar to that of Buccinum undatum, Linn., as are all the cerebral 
ganglia, the salivary glands, the double branchial plumes, the 
mucus fillets and the heart and auricle ; all these organs I have 
dissected and compared with the same parts of that species, without 
finding’ any essential differences.”—Clark. ‘ Bullia rhodostoma, 
Gray, and B. achatina, Lam. Teeth of the radula, Eberhard, 1. ¢. 
p. 14, pl. 5, f. 94,95. Both agree well with Loven’s figure for Bullia 
annulata, Lam., and show that this genus resembles Nassve in the 
middle tooth being multidenticulated, and the true northern 
Buccinums in the denticulation of the lateral teeth.” —Zool. Record, 
1866, p. 179. The lingual ribbon is long and narrow, of crystalline 
transparency ; it is often mounted as an object for the microscope. 
** Proboscis long, retractile, with corneous jaws, and a tongue armed 
with triple rows of teeth, of which the axile one is broad and sub- 
lunate, with numerous serratures, the laterals large and hamate,”— 
