1882.] 'lightning' AND * PORCUPINE ' KXPEDITIONS. 683 



P. 563. Lima subovata. Between Lisbon and Canaries (*Tra- 



vailleur ' Exp. 1882) ; 1192 fms. 



P. 564. Li?na subauriculata. Between the Hebrides and Faroes 



(' Triton ' cruize) ; 570 fms. Josephine Bank ; 110- 



120 fms. 



Lima excavata. Fossil Pliocene : Calabria (^e^wew-a) ! 



P. .066, Mytilus incur vatus. Probably a Pliocene fossil of the 



Bolognese, as Modiola rectemarginafa of Foresti. 

 P. 567. Mytilus phaseolinus. Black Sea (Sprat t) ; 45-50 fms. 

 P. 569. Dacrydium vitreum. Between the Hebrides and Faroes 

 ('Triton' cruise); 570 fms. Azores ('Josephine 

 Exp.) ; 200-300 fms. 

 P. 570. Idas argenteus. Between the Hebrides and Faroes 

 ('Triton' cruise); 516 fms. Inhabiting deserted 

 tubes of Teredo megotara in a large water-logged 

 piece of pine-wood, to which the Idas had fixed 

 itself by a strong byssus. It is covered with a pale 

 brownish-yellow epidermis, which rises into fibrous 

 excrescences on the posterior side. Under the epi- 

 dermis the shell is silvery white. An internal and long 

 cartilage covers the hinge. I was mistaken as to this 

 when I described the species from two small valves. 

 The beak has a reddish colour hke that of Cypricardia 

 lithophagella. The shape varies from rhomboidal to 

 oblong. Size of my largest specimens 3| tenths of an 

 inch or about 8 millimetres. With it in a "commen- 

 sal " way lived an undescribed species of Cocculina, or 

 a new genus of the same family, to which I propose 

 giving the name of spinigera ; this would seem to have 

 fed on decomposed portions of the Teredo. Small 

 Annelids also occupy the tubes and probably have the 

 same habit. The little limpet is coated with a cera- 

 tose sponge, which gives it a prickly appearance. 

 The smaller and younger specimens of Teredo were 

 hving when the piece of wood came up in the trawl. 

 Idas argenteus is probably the species of that name 

 noticed by Verrill as var. lamellosa, from 337 fathoms 

 off the coast of New England. 

 „ Area barbata. C. Verd I. {de Rochebrune). 

 „ Area nodulosa. Fossil. xMiocene : Marne Vaticano 

 (Ponzi). 

 P. 571. Area tetragoaa. C. Verd I. {de Rochebrune). 

 „ Area antiquata. C. Verd I. \de Rochebrune). 

 P. 572. Area obliqua. Josephine Bank, 340-430 fms. 

 „ Area glacialis. G. Mexico {Dall) 1 



„ Area pectuncidoides, yar. septentrionalis. New England 

 {Verrill); 310 fms.! Between the Hebrides and 

 Faroes (' Triton ' cruise) ; 570 and 608 fms. Medi- 

 terranean (Italian Exp., 1881) ; 337-464 fms. 



