Miscellaneous. 387 
Note on Pompholyx, Lea, a new Fumily of Fluviatile Mollusca. 
By Dr. J. E. Gray. 
Mr. W. H. Dall has lately described and figured the animal of the 
genus Pompholyx of Lea, a small freshwater shell found in the Sa- 
cramento River. The animal is peculiar from having “ two pairs of 
eyes—one pair at the end of the long tentacles, and another pair 
situated on the inner base of the tentacles.” ‘‘ The shell is depressed, 
few-whorled, the last whorl the largest, without fold in the colu- 
mella; inoperculate.” 
This genus has hitherto been arranged in Lymneade with Pla- 
norbis. Mr. Dall, in the ‘ Proceedings of the California Academy of 
Sciences’ for 1866, proposed that, on account of the number of 
the eyes, it should be formed into a new family, which he calls 
Pompholine, The existence of the second pair of eyes is an anomaly 
in terrestrial mollusca, and requires confirmation. The black spots 
between the tentacles of some well-known fluviatile Auriculide have 
been mistaken for eyes. Probably this genus may prove to belong 
to the family Auriculide; at any rate, it has been wrongly arranged 
in Lymneade. 
Dredging among the Shetland Isles. 
To the Editors of the Annals and Magazine of Natural History. 
GrNnTLEMEN,—Have the goodness to insert the following cor- 
rections of my last Report on Dredging among the Shetland Isles :— 
Nucula tenuis. The words “ probably Nucula egeensis, Forbes,” 
refer to this species, and not to Leda pygmea. But Forbes’s 
descriptions are by no means satisfactory ; and, unfortunately, 
most. of his types have been lost. His Lima cuneata may be 
the young either of L. elliptica or L. Loscombii—the character 
“testa sequilateralis” being applicable to the former species, 
and “ auriculis ineequalibus” to the latter. 
Cerithium metula, Having now had an opportunity of examining 
Mr. Hanley’s shell, which he dredged in deep water off Villa- 
franca, I am satisfied that it belongs to this species, and not to 
Cerithiopsis Barleet. 
I accidentally omitted in the list Pleurophyllidia Loveni, Bergh, 
dredged by Mr. Barlee in Shetland, and mentioned by Forbes 
and Hanley as the Diphyllidia lineata of Otto. 
To the list of Nudibranchs may be added Lomanotus marmoratus 
of Alder and Hancock. A specimen was dredged at a depth of 
about 80 fathoms off the Whalsey Skerries in 1864, and detected 
by my observant friend Mr. Peach; it was named by Mr. Alder. 
Mr. Norman also writes me word that the following may be 
added on his authority :—Polycera ocellata, A. & H., tidemarks, 
Balta Sound. Zolis pustulata, A. & H. (with £. alba, Idalia 
Leach and I. inequalis, Dendronotus arborescens), in 40-60 
fathoms, St. Magnus Bay, and Z. Landsburgit. These increase 
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