360 
Oli thè genus Pompholyx and its Allies, " 
Several specimens slionld always be examiiied when possible, 
as a certain range of variation is possible, and in tbis way a bet\ 
ter generai idea of thè ribbon is obtained. 
Mudi of thè anatomj may be made out by crushing thè fresh 
animai gradually under thè cover of thè live-box, 
The viscera are liable to be misplaced by this process, and 
otlier specimens shonld be dissected with needles or fine scissors. 
For Works of reference, Leidy on thè anatomy of thè Terr. 
Gasterojioda of thè U. S. (in A. Binney’s Mon. Hel.) may be 
consulted for thè land species ; — wliile Broun, and Mocpiin 
Tandon are almost thè only ones who have given mudi in- 
formation in regard to thè a,natomy of thè fresh-water fornis. 
Cuvier, Vogt, and Baudelot have added niiich information in 
detached papers in regard to a few species. 
While authors may disagree as to thè vaine of thè linguai 
dentition as a basis for classification, yet all must admit that 
every reliable addition to our knowledge of thè subject is of 
great importali ce, and thè details of thè anatomy mudi more so. 
Huxley has recently classified thè air-breathing Mollusca by 
thè flexure of thè intestine. While his generalizations have a 
very slender basis of fact, and are rejected by almost every ma- 
lacologist, yet, niitil dissections oii a more extended scale have 
been made, no one has thè right to consider tlieni as utterly ab- 
surd, nor yet to accept them as proven. 
KEFEKENCES TO THE PEATE. 
Fig. 1 . — Dissection of Pom/pholyx var. solida^ Dall ; showing 
thè digestive and temale generative System, with thè oro'ans 
about thè mouth, as if transparent. 
a, Anus. b, Biiccal piate, c, Crop. d, Auxiliary mucus 
gland. e, Outlet of stomach into intestine, f, Male aperture, 
i, descending intestine, k, Stomach. m, Buccal mass. n,Miis- 
cular band of stomach. o, GEsophagus. ov, Oviduct. p, Piil- 
monary cavity. r. Linguai ribbon. re, Bectiim. s, Organ of 
smeli surrounded by thè salivary gland. t, Ovary. u, Uterus. 
X, Liver. z, Edges of mantle laid back. 
