1884.] 'lightning' and ' porcupine ' expeditions. 357 



Turritella potamoides, Cantraine, Melania (afterwards Chemnitzia) 

 jxillida, Philippi, Parthenia varicosa, Forbes, and Chemnitzia 

 costaria, S. Wood. 



In a specimen from the Gulf of Tunis the throat or inside of 

 the upper lip is crenated, like Chemnitzia costaria of the Crag. 



35. Odostomia magnifica, Seguenza. 



Turhonilla magnifica, Seg., Le formazione terziarie nella Provincia 

 di Reggio (Calabria), 1879, p. 204, t. xvi. f. 25. 



' Porcupine' Exp. 1870 : Atl. St. 6, 16, 25, 27-28. 



Distribution. Vigo {McAndrew), Bay of Biscay (' Travailleur ' 

 Exp. 1880-1881), off C. Verd I., Azores ('Talisman' Exp.), New 

 England (Verrill) ; 21 7-1062 fms. _ 



Fossil. Pliocene : Reggio, Calabria (Seguenza) ! 



This fine species varies considerably in shape, as well as in the 

 number and direction of the ribs, which are sometimes straight and 

 sharp, and in other specimens oblique and flattened ; but there is a 

 character common and peculiar to all the specimens (European, 

 American, and fossil) which I have examined, viz. the close striatum 

 length-wise by delicate and microscopical lines which cover the 

 whole of the shell. These striae are not mere marks of growth, but 

 a distinct kind of sculpture. 



Turhonilla bushiana of Verrill. Not Turhonilla meneghini of 

 Libassi, according to the figure and a typical specimen received from 

 Professor Seguenza; nor is it Turhonilla speciasa of H. Adams. 

 But the last two species are allied to the present, as well as Turbo 

 plicatulus of Brocchi. 



Fragments of recent specimens from the ' Porcupine ' Expedition 

 show that this species attains much larger dimensions than those 

 given in the descriptions of Seguenza and Verrill. 



j/ 36. Odostomia lactea, Linne. 



Turbo lacteus, L. S. N. p. 1238; Cantr. Mai. Med. pi. vi. f. 21. 



O. lactea, B. C. iv. p. 164 ; v. p. 213, pi. lxxvi. f. 3. 



'Porcupine' Exp. 1869: St. 9. 1870: Atl. Vigo B. ; Med. 

 Algeciras B., Gr. Tunis, Adventure Bank. 



Distribution. Tromso to the Archipelago, Adriatic, Marocco, 

 Canary I., Madeira, and Azores ; 0-50 fms. Perhaps this may be 

 Chemnitzia nivea of Stimpson from 40 fms. off Grand Maran, which 

 he described as " T. aciculata, subcylindrica, alba, nitida ; anfractibus 

 planatis, longitudinaliter plicatis, plicis rectis, interstitiis lsevissimis. 

 Long. 028 ; lat. 004 poll." Not Red Sea, as given by Philippi 

 on the authority of Hemprich and Ehrenberg. 



Fossil. Miocene : Vienna and Bordeaux Basins. Pliocene : Coral- 

 line and Red Crag, Belgian Crag, Biot (Battersby), Nice (Allan), 

 Italy. Post-tertiary : Belfast, Selsea, Leghorn, Taranto, Morea, 

 and Rhodes. 



Turbo albus, Pennant, T. acutus, Donovan, T. elegantissimus, 

 Montagu, Turhonilla plicatula, Risso, Melania campanula, Philippi, 

 and several later synonyms which it is unnecessary to notice, Risso's 



