Mr. J. G. Jeffreys on some British Shells. 17 



subovalis, superne et infra subangulata. Peristoma simplex. Ex- 



terius labrum intus transversim striatum ; interius in columellam 



reflexum, postice incrassatum et umbilicum angustum obtegens. 



Plica columellaris acuta, in medio aperturse posita. Operculum 



ut in aliis Odostomiis. Long. ^, lat. -j^ unc. 



A few specimens of this shell were dredged by Mr. Barlee 

 and myself during this month in about fifty fathoms water off 

 Skye. 



This appears to be the O. unidentata of Thorpe's l British Ma- 

 rine Conchology/ p. xxxv, but not of Montagu, Turton, Fleming 

 or Macgillivray. It differs from that shell in the volutions more 

 gradually tapering, and in wanting its subconic form ; the volu- 

 tions also being rather flattened instead of rounded ; the apex 

 being more obtuse ; the suture not being so deep ; and especially 

 in its being slightly striated longitudinally instead of having the 

 delicate but faint spiral striae perceptible under a magnifying 

 glass in the other species, and having the interior of the outer 

 lip striated transversely. It has much the appearance of an 

 Eulima [Eulimella, Forbes), to which genus the Odostomice seem 

 to be closely allied. 



I suspect my Eulimella gracilis is the Eulima affinis of Phi- 

 lippi, vol. ii. p. 135. t. 24. f. 7. 



Eulimella clavula. Turbonilla clavula, Lov. p. 18. Several 

 specimens of this distinct species were received by Mr. Barlee 

 from Loch Fyne. In many of them the first whorls are more or 

 less eroded. 



Many other species of Rissoa, and what are called Odostomia 

 and Eulimella, besides those which are described in works on 

 British Conchology, and by Messrs. Thompson and Alder in the 

 ' Annals/ have been found by Mr. Barlee and myself on the coasts 

 of Devonshire and South Wales ; and a great deal remains to be 

 done in elucidating the species which compose this group of 

 Pectinibranchous Gasteropoda. 



Margarita pusilla, n. s. 

 Testa subglobosa, nitida, subopaca, glabra, alba. Anfractus 4, con- 



vexiusculi, ultimus valde reliquos exsuperans, sutura distincta di- 



visi. Apertura subrotunda, peristomate simplici et columella; 



adnato. Umbilicus angustus, canaliculars. Long. -^ l a t. ^j unc. 



Found by Mr. Barlee last year in deep water off the Isle of 

 Skye, and by myself previously in the Shetland Isles and Loch 

 Carron. 



It differs from the young of M. vulgaris in its more globose 

 form and consequently more contracted umbilicus, as well as in 

 the absence of striae on the base. 



Varieties of Natica Alderi [Nerita glaucina var. /£. of Turton's 

 Conchological Dictionary) and of N. rufa, in each case having 



Ann. $ Mag. N, Hist. Vol.xx. 2 



