300 Mr. J. Gwyn Jeffreys on Dredging 
function is quite different. I would call these organs cap- 
tacula, an appropriate word and not less classically formed 
than tentacula. 
Leda pernula was again dredged in St. Magnus Bay ; but 
with it was a dead and apparently semifossil valve of Tellina 
calcarea. I must theretore hesitate in considering the one 
more than the other recent or an inhabitant of the British seas 
at the present time. 
Being in the south of Europe last winter I undertook the 
examination of the Mediterranean and Adriatic shells; and the 
result greatly surprised as well as interested me. The dredg- 
ings of Capt. Acton (the Commandant of the Italian navy) in 
the Gulf of Naples, and the extensive collections of Dr. Tiberi 
at Portici, General Stefanis at Naples, Herr Weinkauf from 
Algeria, and of Dr. Brusina at Zara, especially yielded a 
vast quantity of new material for a comparison of the marine 
testacea of the north and south of Europe. Many of the 
species having been described (some insufficiently) under 
different names, the difficulty of identification is considerable ; 
but there is no doubt that a remarkable concordance exists, 
and to a great extent, between the mollusca which inhabit 
the deeper parts of the Atlantic and Mediterranean seas from 
62° to 36° N. lat. The littoral kinds differ much more—a 
circumstance which may have been occasioned by climatal 
conditions. ‘To exemplify the former proposition I subjoin a 
list of 75 species, usually considered northern, which are 
common to the North Sea and the Mediterranean, with their 
principal synonyms :— 
Names of Species. Synonyms. 
Terebratula caput-serpentis, Linné. 
Argiope lunifera, Philippi ........ Terebratula cistellula, Searles Wood. 
Crania anomala, Miiller .......... Anomia turbinata, Polt. 
Pecten septemradiatus, Mill. ...... Ostrea inflexa and O. clavata, Polt. 
IPORTAtUs, CINCH rie vice a's alee sine P. Bruei, Payraudeau. 
PP RGR be, AD BONE Bag Sata hte Souls sles P. furtivus, Lovén. 
P. striatus, Mill. 
PO Haskynsls POrves ccc. cave observes P. imbrifer, Zov. 
P. vitrous,, Chemnitz ..cccscsesares P. Gemellarii-filii, Biondi. 
PuSUT IS, TSK CY «5 cunts oeissetsals nore P. pygmeeus, von Miinster. 
LEVEES a. CHW 01 Ree Ae eee Perhaps L, crassa, Forbes. 
L. elliptica, Jeffreys. 
L. subauriculata, Montagu. 
LESSEN Wea 0c EIS 0) Sa ee a ean P. pectinata of some authors, not 
of Linné. 
Mytilus phaseolinus, Ph. 
Modiolaria discors, L. 
Nucula nitida, G. B. Sowerby. 
IN: COWDURS Oi a foie 2) ss oes ols N. decipiens, Ph. 
Leda pygmeea, v. Miinst........... Probably Nucula segeensis, Ford. 
UATCR ODIQURSEHea «le ec ae shasta sees 5 A. Korenii, Danielssen, 
