1881.] 'lightning' and 'porcupine' expeditions. 721 



Distribution. Mediterranean and Adriatic ; 10-20 fms. 

 Fossil. Upper Tertiaries and Post-tertiary : S. France, Italy. 

 T. rostrata of Born and Poli, but not of Linne. 



k^ 11. Tellina distorta, Poli. 



T. distorta, Poli, Test. utr. Sic. i. p. 39, t. xv. f. 11. 



'Porcupine' Exp. 1870: Med. St. 55, G. Bona, Benzert Road, 

 G. Tunis, Adventure Bank. 



Distribution. Throughout the Mediterranean, Madeira and Ca- 

 naries ; 5-60 fms. 



Fossil. Post-tertiary : Calabria. 



I still believe this to be a variety of 7'. donacina ; but in defer- 

 ence to other conchologists, I will retain it as a provisional species. 

 The difference seems to consist in the smaller size and greater angu- 

 larity of the posterior side. It may be as distinct as T, pusilla. 



^ J 2. Tellina donacina, Linne. 



T. donacina, L. S. N. p. 1118 : B. C. ii. p. 386; v. p. 187, 

 pi. xh. f. 4. 



' Porcupine ' Exp. 1870 : Atl. St. Vigo B., C. Sagres, Tangier B. 



Distribution. Scotland to the Archipelago and Sea of Marmora, 

 Black Sea, Adriatic, Madeira ; 0-82 fms. 



Fossil. Miocene : Austrian Empire, Switzerland, S.W. France. 

 Upper Tertiaries and Post-tertiary : Coralline Crag and Scotland, 

 Belgium, S. France, Italy, Algiers, Greece, Rhodes, Madeira. 



f/" 13. Tellina pusilla, Philippi. 



T.jmsilla, Phil, Moll. Sic. i. p. 29, t. iii. f. 9a,b: B. C. ii. 

 p. 388; V. p. 187, pi. xh. f. 5. 



' Lightning ' Exp. : St. 5. 



'Porcupine' Exp. 1869: St. 13, The Minch, 52. 1870: Atl. 

 Vigo B., C. Sagres, 30 ; Med. Algesiras B., 40, Adventure Bank. 



Distribution. W. Finmark and Faroe I. to Mediterranean and 

 Adriatic ; 3-205 fms. 



Fossil. JNIiocene : N.W. Germany (Philippi). Upper Tertiaries 

 and Post-tertiary : Italy, Rhodes. 



1\ pygmcea (as of Philippi), Loven. 



^ 14. Tellina tenella^ Jeffreys. (Plate LXI. fig 11.) 



Shell trapezoid-shaped or irregularly oblong, much compressed, 

 rather thin, semitransparent, and glossy : scidpture, irregular con- 

 centric impressed strise, which become ridge-like towards the 

 posterior side ; the umbonal area is covered with close-set delicate 

 strise : colour pinkish, with longitudinal and broken rays of a deeper 

 tint ; there is no streak below the beak as in T. donacina ; the whole 

 surface is crossed lengthwise with very numerous fine whitish radiating 

 lines, which are only observable with a lens and appear to permeate 

 the structure of the shell: epidermis fibrous, yellowish brown, 



^ Somewhat delicate. 



