ΟΝ SOUTH-EUROPEAN MARINE INVERTEBRATA. 275 
Species of Mollusca obtained at Gibraltar end of April and beginning of 
May 1849. 
Fre- 
quency. 
Living at 
Gastrochena cuneiformis .|_ ...... 4 to 8 f. | local jin stone. 
Saxicava arctica .........Ὑ νι}  seeeee 8to40f.| ... [ποὺ common. 
= ——,, Vale? .ececescee]  ceces . | 40 fath. | 1 spm. 
Venerupis irus............... shore 8. ὃς freq. 
Panopea Aldobrandi ......} .... + ahi. local {fragments on Med. shore. 
Corbula nucleus .........606| ssa 8 to 20f,| freq. 
Nezra cuspidata............| 45 fath,} ...... rare. 
— costulata...... μεν} 45 fath, | ...... rare. 
Pandora obtusa ............| ..... |lOto25f.) rare. 
Thracia convexa ............| 45 fath, | ...... l valve. 
—— pubescens .........666) ccs. 8fath. | rare. 
Solen siliqua .......... +....| Shore sabia 1 τϑᾳ. 
—— pellucidus ............} | ...... | 40fath. | ν. Υ. 
Solecurtus antiquus ...... 4to8f.] τέο. rare |valves. 
— strigillatus ............] shore sevees | local. |valves. 
—— candidus............... sh. &6f.} ...... | rare. 
Solemya mediterranea ...! shore | 6fath. | rare |only one living specimen. 
Psammobia vespertina ...} shore | ...... freq. 
—— costulata...... eooeee.--| 8 fath. ters rare. 
——ferroensis ......, sees 8 fath. σαι... . (td beal; 
Tellina tenuis ...... ἐξ φύφο shore | ...... freq. |Med. shore. 
— pulchella............... shore | ...+6 . | local. 
—— distorta ......cecsecees|  ceeees 8 fath. | local. 
— donacina? ........06) eee 8fath. | rare jone specimen. 
==" CTASSA cesivcscseevesers| sovees 8fath. | rare jone specimen. 
—— serrata .............../15 to 451. 40 fath. | rare {frequent valves. 
—— Balaustina ............] 2.0... 45 fath..| ... {one specimen (large), size of the 
—— depressa ............. .| shore | ...... freq. | British specimens; it appears to 
Diodonta fragilis ......... shore | «+... freq. | . become smaller, but more abun- 
Scrobicularia Cotardi ...... shore  ...... Ἴ local.| dant further eastward. 
Donax trunculus............ shore seh ἐς freq. 
VENUSUS ...... Ὁ οννονον shore | ...... local. 
----- POlitus .......seececee] τννννον 8fath. | rare. 
Mesodesma donacella...... shore | «.... freq. 
Mactra subtruncata ......| shore | ...... freq. 
—— helvacea? ............ shore sus gee | ας. 
_ |Corbula —~—, new? ......} ...... Sfath. | rare |small, triangular, elongated. 
} Lutraria elliptica............ shore | ss. valves.) . 
_ |—elongata............... Sfath. Γ΄ ...... valves. 
Pee FUOSA ....:...........} SHOTE | ..... 1 valve. 
Tapes decussata ............ shore  .....» freq. 
Pm - αὐγϑα...ς. 9. ὁ. .ννονο δον shore eS PEE freq. 
|—— Beudantii ............ shore σον. [odreq, 
—— geographica ...,.....] shore | ...... local. 
—— florida................ direhores Ὁ (ae... local. 
—— virginea ...............| 8fath, | 8fath. | freq. 
Cytherea venetiana......... sh. 40 f. | 6 to 25 f.| freq. 
|---- —, var.? ornew ?.|20to 45 1.) 30fath.| rare |valves not unfrequent, only one or 
— chione........... ......\sh.8fath.| 8fath. | freq. | two living, white, concentrically 
Venus gallina ............... shore «.. | freq. | wrinkled. 
—— Striatula ..........0..0.] νον, | 40 fath. | local. 
——- VeITUCOSA ......Ἅ«ἁ«ὐνον sh. to6f.| 6fath. | freq. 
_ |——fasciata’.............. .|sh.to 20f,| 8fath. | freq. 
bee CASING .. 0... .. 8250.08. ww 8fath. | rare finely coloured, 
Πρ -οὐναίᾶ. .............. Ἔν PRED 6to40f.| freq. 
—— —, new? .....Ψ.. ΕΒ Α 8fath..| rare |two small specimens allied to V. 
casina, smaller, more orbicular, 
ὃ μι: convex, white. 
e Danmoniensis......} ....,. | 45 fath. | local |young and old, identical with British. 
ee, 
