1884.] 'lightning' AND 'porcupine' EXPEDITIONS. 347 



6. Odostomia acuta, Jeffreys. 



O. acuta, Jeffr. iu Ann. & Mag. N. H. 2nd ser. ii. p. 338 : B. C. 

 iv. p. 130; v. p. 211, pi. lxxiii. f. 8. 



' Porcupine' Exp. 1870 : Med. St. 50, Benzert Road, Adventure 

 Bank (dwarf variety). 



Distribution. Lofoten I. to E. Mediterranean and the Adriatic, 

 Canaries and Teneriffe ; 0-120 fms. 



Fossil. Pliocene : Coralline and Red Crag, and Sicily. Post- 

 tertiary : Belfast and Selsea. 



Clark was right in saying that the throat was grooved in some 

 specimens. I have one of this kind which was dredged by Mr. 

 Verkriizen at Falmouth. Mr. Pidgeon remarks in his letter to me of 

 the 9th November, 1874, that this species is "most abundant at 

 Torquay, under stones at low water, spring-tides, but never unless 

 associated with tubes of Serpula. To-day I found one stone which 

 was crowded with them, nestling among the tubes ; neighbouring 

 stones could not show a specimen, if they were free from Serpulee." 



7. Odostomia conoidea, Brocchi. 



Turbo conoideus, Brc. Conch. Foss. Subap. ii. p. 659, t. xvi. f. 2. 



O. conoidea, B. C. iv. p. 127; v. p. 211, pi. lxxiii. f. 6. 



« Porcupine ' Exp. 1869 : St. 2, 13, 18. 1870: Atl. 6, 10, Vigo 

 B., Setubal B., C. Sagres, 30; Med. off Jijeli, Benzert Road, Rasel 

 Amoush, G. Tunis, Adventure Bank. Nearly all the specimens 

 belong to the variety australis, a few to an intermediate form. 



Distribution. Hammerfest to the Archipelago and Adriatic ; ? Red 

 Sea (Philippi) ; 0-130 fms. 



Fossil. Miocene, Pliocene, and Post-tertiary : throughout Europe 

 and Rhodes. 



The synonyms are numerous. I have noted eleven, including 

 Rissoa polita of Scacchi, Odontostoma sicula of Philippi, Fulima 

 monodon of Requien, Odostomia nagli and O. sismondce of 

 Seguenza. 



My friend the Marquis de Foliu found a monstrous specimen on 

 the northern coast of Spaiu which has a complete peristome. 



i 8. Odostomia tenuis l , Jeffreys. (Plate XXVI. fig. 4.) 



Shell oblong, slender, rather thin, nearly transparent, and 

 glossy : sculpture none except exceedingly fine and close-set lines of 

 growth, which are observable only under a microscope : colour 

 whitish : spire elongated ; apex or nucleus rather prominent : whorls 

 6, somewhat compressed, gradually enlarging ; the last equals three 

 fifths of the spire with the mouth placed upwards ; suture rather 

 shallow : mouth oval, slightly contracted above, curved below ; its 

 length does not much exceed one third of the shell ; the inside is 

 marked with half a dozen short grooves or striae in the direction of 

 the spire, which are distinctly seen through the shell : outer lip 

 sharp : inner lip folded back on the pillar and continuous with the 



1 Slender or slim. 



