18S4.] 'lightning' AND 'porcupine' EXPEDITIONS. 365 



Family XVIII. EULIMIDiE. 

 ^ Genus Gegania ^ Jeffreys. 



Shell conical, reticulated, not umbilicated ; nucleus globular and 

 intorted, not spiral, nor sinistral. Differs from Mathilda in having 

 a short spire and an intorted but not a heterostrophe nucleus. 



Perhaps this genus, which in a great measure is founded on 

 negative characters, may be the type of a separate family. The 

 shell certainly is not smooth and polished like Eulima. 



Gegania pinguis'^ Jeffreys. (Plate XXVII. fig. 10.) 



Shell forming a short cone, rather thin, opaque and of a dull 

 hue : sculpture, several spiral ridges, which are crossed by much 

 more numerous and fiexuous longitudinal stria, so as to cause a 

 partial decussation ; the spiral ridges vary considerably in number 

 and strength, and sometimes they are alternately large and small, 

 but they become at the base crowded and fine revolving striae ; apex 

 smooth and glossy : colour whitish : spire short, bluntly pointed : 

 whorls 5, swollen ; the last occupies more than two thirds of the 

 shell ; nucleus bulbous, introverted : suture deep : mouth squarish, 

 acutangular above and nearly rectangular below : outer lip semi- 

 circular except for the upper corner of the mouth : inner lip reflected, 

 broader on the lower part of the pillar, wliich is very gently curved : 

 base expanded, slightly concave or depressed but not umbilicated 

 nor angulated. L. 0-3. B. 0'16. 



'Porcupine' Exp. 1870: Atl. St. 16, 17, 17a. 



> 1. Eulima subulata, Donovan. 



Turho subulatus, Don. Br. Sh. pi. clxxii. 



E. subulata, B. C. iv. p. 208 ; v. p. 215, pi. Ixxvii. f. 7. 



'Porcupine' Exp. 1869 : St. 2, 9, 18 (and var. nana). 1870: 

 Atl. Vigo B., 29, 30 (var. paUidula) ; Med. .50, 55, Beuzert Road, 

 G. Tunis, Adventure Bank. Variety pallidula ; bauds of a paler 

 colour, and more or less interrupted. 



Distribution. Dublin Bay and other parts of Ireland, Anglesea, 

 and southern coasts of England, Atlantic coasts of France and Lusi- 

 tania, throughout the Mediterranean and Adriatic, Canaries, Madeira, 

 and Azores ; 2-22 7| fms. I suspect that the following localities 

 may liave been misapplied to this species instead of to E. biline- 

 ata: — Scarborough {Bean) ; Orkneys, 12 fms. {Forbes); Shetland, 

 5-90 fms. {Forbes). 



Fossil. Miocene : Vienna and Bordeaux Basins, N.W. Germany, 

 Transylvania, Podolia, and Volhynia. Pliocene: Coralline and 

 Antwerp Crags, France and Italy. 



Of the numerous synonyms, which it is unnecessary to recapitu- 

 late, glaber of Da Costa is prior to subulata and every other ; but the 

 present name has been sanctioned by use. The dwarf variety 

 {nana) shows that size is not the only character which distinguishes 



^ The name of one of the Vestal Virgins. ^ Phimp. 



Proc. Zool. Soc— 1884, No. XXV. 25 



