1881.] 'lightning' AND 'porcupine' EXPEDITIONS. 947 



Family XXIII. Pholadid^e. 

 ^Pholas CANDIDA, Liniie. 



P. candidus, L. S. N, p. Ill 1 . 



P. Candida, B. C. iii. p. 107 ; v. p. 193, pi. Hi. f. 2. 



'Porcupine' Exp. 1870: Med. St. 50 (fragment). 



Bistrihution. Coasts of Scotland to Sicily, Adriatic, Black Sea, 

 Mogador ; low water ^ 



Fossil. Pliocene : S. Miniato, Tuscany. Post-tertiary : Norwar, 

 England, and Belfast ; 0-600 ft. 



Xylophaga dorsalis, Turton. 



Teredo dorsalis, Turt. Concb. Diet. p. 185. 



X. dorsalis, B. C. iii. p. 120, pi. iv. f. Sl v. p. 193, pi. liii. f. 4. 

 _' Porcupine ' Exp. 1869: St. 5 (valves). 1870: Cartagena B. 

 (in floating wood). Adventure Bank (valve^,). 



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. MACTRIDiE Amphidesma 2 



Mactra 3 



Lutraria 3 



Scrobicularia 6 



XVII. SOLENID^ SoLECURTus 2 



Ceratisolen 1 



SOLEN 3 



XVIII. PANDORID J3 Pandora 1 



Lyonsia 3 



Pecchiolia 7 



Pholadomya 1 



XIX. ANATINIDiE Thracia 5 



XX. CORBULID^ PoROMYA 2 



NEiERA 21 



CORBULA 2 



XXI. MYID^ Mya 2 



XXII. SAXICAVID^ Panopea 1 



Saxicava 1 



XXIII. PHOLADID/E Pholas 1 



Xylophaga 1 



■ Total 68 



^ Professor Lovcn gave Norway ns a habitat on Spengler's aiitbority ; but 

 P. pajjyraceits of Solauder, referred to by Spengler in the ' Skrivtcr af Natiu'- 

 historie-Selskabet ' (ii. i. 92), is there stated to be "medio sulco iiotata,'' which 

 character belongs to P. crispata, and not to P. Candida ; and the habitat given 

 by Spengler was Schleswig or South Jutland in the North Sea. Spengler's 

 figure, however, represents P. Candida. 



61* 



