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Show 1881.] 'LIGHTNING'AND'PORCUPINE'EXPEDITIONS. 947 Family XXIII. PHOLADIDJE. PHOLAS CANDIDA, Linne. P. candidus, L. S. N. p. 1111. P. Candida, B. C. iii. p. 107; v. p. 193, pi. Hi. f. 2. 'Porcupine' Exp. 1870 : Med. St. 50 (fragment). DistriBution. Coasts of Scotland to Sicily, Adriatic, Black Sea, Mogador ; low water \ Fossil. Pliocene : S. Miniato, Tuscany. Post-tertiary: Norwav, England, and Belfast; 0-600 ft. XYLOPHAGA DORSALIS, Turton. Teredo dorsalis, Turt. Conch. Diet. p. 185. X. dorsalis, B. C. iii. p. 120, pi. iv. f. 3 ; v. p. 193, pi. liii. f. 4. ' Porcupine ' Exp. 1869: St. 5 (valves). 1870: Cartagena B. (in floating wood), Adventure Bank (valves^). DistriBution. Loffoden Is. to Sicily, Adriatic, G. St. Lawrence to Cape Cod ; 0-650 fms. Fossil. Miocene : Vienna Basin, Calabria. Pliocene and Post-tertiary : Calabria. SUMMARY OF THE FOREGOING LIST. Families. Genera. No. of species. XVI. M A C T R I D . E AMPHIDESMA 2 MACTRA 3 LUTRARIA 3 SCROBICULARIA 6 XVII. SOLENIDiE SOLECURTUS 2 CERATISOLEN 1 SOLEN 3 XVIII. PANDORIDJ3 PANDORA. ., 1 LYONSIA 3 PECCHIOLIA 7 PHOLADOMYA 1 XIX. ANATINID.E THRACIA 5 XX. CORBULIDiE POROMYA 2 NE,ERA 21 CORBULA 2 XXI. MYID^E MYA 2 XXII. SAXICAVID.E PANOPEA ... 1 SAXICAVA 1 XXIII. PHOLADID.E PHOLAS 1 XYLOPHAGA 1 Total 68 1 Professor Lov6n gave Norway as a habitat on Spengler's authority; but P. papyraceus of Solander, referred to by Spengler in the ' Skrivter af Natur-historie- Selskabet' (ii, i. 92), is there stated to be " medio sulco notata," which character belongs to P. crispata, and not to P. Candida ; and the habitat given by Spengler figure, howe vwears, Srcephrleessewnitgs oP.r C aSnoduitdha .J utland in the North 6S1ea*. Spengler's |