I70 JOURNAL OF CONCHOLOGY, VOL. 15, NO. 6, APRIL, I917. 



mollusca, thus rendering Mattdiella superfluous. 



There has always been a difficulty in allocating this shell to a satis- 

 factory position, its place in Aclis being only provisional. When 

 Clark discovered it he called it Fherusa, but he actually described it 

 as a Chemnitzia^ and it has appeared under various other names. 



P. gulsonae Clark. — Berehaven 5f., and Dursey Island z^i. 

 (R.I. A. cruise); Mull of Cantire 2of. Also Adventure Bank 92f. 

 ('Porcupine')! and from the same locality in i2of, with var. cincta 

 Marsh. ('Shearwater'). 



Odostomia minima Jeff. — Off Loch Ryan 2 5f. Not Alderney, 

 recorded in error by Mr. Marquand in mistake iox Jeffrey sia diaphaiia. 

 Also off the Tripoli coast 40-1 2of, and Adventure Bank i2of. 

 (' Shearwater ') ! and in the latter district in 92f (' Porcupine ') ! 



The Marquis di Monterosato eliminates this species from the 

 OdosiomicB, and combines it with Jeffreysia cylindrica under a new 

 genus or sub-genus of Aclis, for which he adopts the name Cima. 

 Jeffreysia cylindrica has certainly some affinity with O. minima on the 

 one hand, and with O. nitidissima on the other. It resembles the 

 the former species in the texture of the shell and in the peculiar 

 fliexuous microscopic longitudinal striae, while in outward appearance 

 it more closely resembles the immature stage of O. nitidissima. 



Although Jeffreysia cylindrica was discovered many years ago at 

 Spezia, in 12 fathoms, it remains rare. I can record it, however, 

 from the Tripoli coast in i2of. Adventure Bank 92f, and at some 

 distance off the latter district in i2of 



O. nivosa Mont. — Alderney (Marquand) ! 



O. truncatula Jeff. — The name oi Jordaniella has been conferred 

 on this shell as a brand-new genus. It is not differentiated in any 

 way, but its author simply imposes the name, because, he says, " Mr. 

 Jordan's name is appropriately associated with O. truncatula, he 

 being the first to recognise its peculiarities,"^ a rather slender claim 

 for creating a " new genus " at this time of day, even if it were true, 

 which it is not. The truth is that O. truncatula was first discovered 

 and made known by the three gentlemen whom I have named,^ and 

 while Gwyn Jeffreys subsequently described it in 1850, and Forbes and 

 Hanley in 1852, yet neither of these six gentlemen were aware of 

 " Mr. Jordan's name being associated with it," appropriately or other- 

 wise, which is not surprising when it is remembered that Mr. Jordan 

 was a boy at school at the time. 



1 Ann. Mag. N. Hist., vol. vi., p. 459, ser. 3. 



2 Proc. R.I. Acad., 1898, vol. v., p. 21. 



3 Journ. of Conch., 1899, vol. 9, p. 224. 



