24 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



similar condition have been described from other scientific expeditions, 

 but in my opinion no real gain is achieved by giving names to such 

 material. 



It must be assumed that, where molluscs are not recorded as ' live' 

 in the following pages, only dead specimens were taken. Occasionally 

 it has been doubtful whether the shells were really ' live ' or only 

 fresh dead specimens, and in such cases I have recorded them as dead 

 shells. 



!Nine parts of the " Report" were written by Jeffreys, namely: — 



Part I. Brachiopoda. P.Z.S., 1878, pp. 393-416, pis. xxii, 



xxiii. 

 1879, pp. 553-588, pis. xlv, 



xlvi. 

 1881, pp. 693-724, pi. Ixi. 



1881, pp. 922-952, pis. Ixx, 

 Ixxi. 



1882, pp. 656-687, pis. xlix, 1. 

 , 1883, pp. 88-11 5, pis. xix, XX. 



1884, pp. 111-149, pis. ix,x. 

 1884, pp. 341-372, pis. xxvi- 

 xxviii. 

 ,, IX. ,, ,, 1885, pp. 27-63, pis. iv-vi. 



In the first place, it becomes necessary to correct a few of the details 

 as to stations, etc., given by Jeffreys (P.Z.S., 1878, pp. 394-397), the 

 following notes being due to Mr. Marshall. In the cruise of 1869, 

 Station 1 was really at 51° 51' N. and 11° 50' W., and the depth 

 was 370 fathoms. In the cruise of 1870, the depths of Stations 

 17 and 17^ should be 600-1095 and 740 fathoms respectively. 

 In Mr. Marshall's view "Tangiers Bay, 35 fathoms" was an accidental 

 substitution for " Station 35, 335 fathoms " ; it appears duly, however, 

 with a list of some shells obtained there, in Jeffreys' notebook, while 

 under the deep-water locality Jeffreys records that the bottom 

 was "clayey mud," and that there was "no dredging." It is only 

 right, however, to warn students that though the locality is herein 

 quoted as " Tangiers Bay, 35 fathoms," there is some little uncertainty 

 on the point. In the second cruise in the Mediterranean, Station 53, 

 Algerine Coast, 112 fathoms, was omitted. Further, Mr. Marshall 

 writes: "Dr. Gwyn Jeffreys has substituted, by error, Station 55 for 

 Station 56 throughout his papers on the Porcupine Expedition, and 

 the differences between the two are most material. Station 55 was 

 off the coast of Algiers iu 1456 fathoms, whence the dredge came 

 up loaded with 'barren mud," while Station 56 was close to the 

 Island of Pantellaria, in 390 fathoms, and was a most successful haul 

 as regards Mollusca. All the dredgings passed through my hands, 

 and there were no bags labelled 'St. 55.' This is important, 



1 Proc. Eoy. Soc, No. 125 (1870), p. 174. 



