Miscellaneous. 387 



Note on Pompholyx, Lea, a new Family of Fluv'iatile 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 Kiver. 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 Lymneadce with Pla- 

 norbis. Mr. Dall, in the ' Proceedings of the CaHfomia 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 

 Pompholince, 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 Auriculidce have 

 been mistaken for eyes. Probably this genus may prove to belong 

 to the family Auriculidce ; at any rate, it has been wrongly arranged 

 in Lymneadce. 



Dredging among the Shetland Isles. 



To the Editors of the Annals and Magazine of Natural History. 



Gentlemei^, — Have the goodness to insert the following cor- 

 rections of my last K-eport on Dredging among the Shetland Isles : — 



Nucula tenuis. The words " probably Nucula cegeensis, Forbes," 

 refer to this species, and not to Ledapygmcea. 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. elUptica or L. Loscombii — the character 

 "testa aequilateralis " being applicable to the former species, 

 and " auriculis inaequalibus " to the latter. 



Cerithium metula. Having now had an opportunity of examining 

 Mr. Hanley's shell, which he dredged in deep water off" Yilla- 

 franca, I am satisfied that it belongs to this species, and not to 

 Cerithiopsis Barleei. 



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 marmoratv^ 

 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. Eolis pustidata, A. & H. (with E. alba, Idalia 

 Leachii and /. incequalis, Dendronotus arborescens), in 40-60 

 fathoms, St. Magnus Bay, and E. Landsburgii. These increase 



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