MARSHALL: ADDITIONS TO "BRITISH CONCHOLOGY." 17I 



Having subsequently found the name of Jordaniella preoccupied, 

 the author substituted Jordanula in its place/ but still without giving 

 any definition of what he meant by it, so that before this so-called 

 new genus can have any scientific existence it will be necessary to 

 define it if possible. 



O. clavula Lov. — S.W. Ireland (R.I.A. cruise); off Loch Ryan 

 25f., Mull of Cantire 24f., and Kilbrannan Sound 25f. A rare species, 

 but in the south-west of Ireland and in the Sound of Sleat it is com- 

 paratively plentiful. 



O. lukisi Jeff. — Aldemey (Marquand) ! Connemara ; off Loch 

 Ryan 27f., Benbecula Sound lof., and West Orkneys 45f. Also 

 Algerian coast iiaf. (' Porcupine') ! Gwyn Jeffreys' original figures of 

 this shell in the "x\nnals " are unreliable. 



O. albella var. subcylindrica Marsh. — Caldy Island. 



O. rissoides var. alba Jeff. — Off Loch Ryan 2 5f. 

 var. nitida Aid. — Tenby. 



var. glabrata F. & H. — Torbay, Tenby, and Killala Bay. 

 var. exilis Jeff. — Caldy Island. 



The O. pithus of Tomlin and Shackleford, from St. Thome, West 

 coast of Africa, appears to be very closely allied to O. rissoides. I have 

 not seen the shell itself, but from the description of the authors and 

 the very excellent figure^ I should have been inclined to include it 

 under O. rissoides but for its widely different geographical source. 



O. pallida var. notata Jeff. — This variety was founded on a 

 solitary specimen obtained at Lerwick in the Shetlands, but I do not 

 consider it tenable. I have various specimens of O. pallida with 

 " convex whorls," as well as some from Lerwick itself which are 

 "convex" and narrow, but in none of them are the spiral striae 

 " more conspicuous." 



O. umbilicaris Malm. — 6 to 60 fathoms. Clyde mouth (Simpson) ! 

 off Loch Ryan 2of and 28f (less rare than elsewhere); Mull of 

 Cantire 27f., Lismore 6-iof, Oban 25f., the Minch 5of., Dornoch 

 Frith, and Scalloway in W. Shetlands i2f. Those from the Minch 

 are much larger than usual (13 lines by 6), and one of them is finely 

 striated spirally. 



var. elongata Jeff. — Torbay, off Loch Ryan 20-2 8f., Ailsa Craig 

 27f., Kilbrannan Sound 2o-3of., off Arran 6of., Loch Fyne 2of., 

 Loch Inver 25f. Those from Ailsa Craig belong to a dwarf form of 

 this variety, as well as one from Torbay and one from Gairloch. 



The apex in this species is nearly always horizontally exposed, as 

 in O. acuta. Collectors will experience some difficulty in separating 



1 Journ- ef Conch., igoi, vol. lo, p. 8. 



2 Journ. of Conch., 1915, voL 14, p. 308, pi. s, fig. 4. 



