Mr. J. Gwyn Jeffreys on Mediterranean Mollusca. 457 
XLVI.—Mediterranean Mollusca. No. 2. 
By J. Gwyn Jerrreys, F.R.S. 
SINCE the publication of my paper on this subject in the 
* Annals’ for July last I ees artes several cea collec- 
tions in Sicily and at Naples; and I shall be glad to correct 
a few errors which unavoidably occurred in my notice of more 
than three hundred species. 
BRACHIOPODA. 
Platydia Davidsoni.—This certainly belongs to the genus 
Megerlia; and I am inclined to agree with Philippi that it is 
an abnormal form of M. truncata, as, indeed, was suspected by 
Scacchi, who described it in 1833 under the name of Terebra- 
tula monstruosa. The lower valve, being attached to coral, 
1s usually flat, although sometimes puckered or indented so as 
to fit the sinuosities of its point d'appui; and consequently 
the striz on this valve are wanting. ‘The tubercles, however, 
are now and then observable on its edges, where the attach- 
ment has not been complete. A still greater range of varia- 
tion, as regards shape and sculpture, is exemplified in Anomia 
ephippium. I cannot detect any essential difference in the 
skeletons of the typical and monstrous forms of M. truncata. 
CONCHIFERA. 
Pecten Teste.—With respect to the recorded depth of about 
1100 fathoms, I may remark that when I was at Malta Mr. 
Gibson, the manager there of the Anglo-Indian Submarine 
Telegraph line, showed me a chart and notes which threw 
considerable doubt on the accuracy of the information supplied 
to M honse Milne-Edwards. It seems that the cable 
between Cagliari and Bona parted and was taken up in com- 
He is nearly right in 
his inference that this is one of the Crag species hitherto con- 
sidered extinct but inserted in my list as still living. I have 
now, through the kindness of Mr. M‘Andrew, seen the typical 
