1884.] 'lightning' and 'porcupine' expeditions. 355 



' Porcupine ' Exp. 1870 : Atl. St. Tangier B. Two specimens. 



Distribution. Algiers, a fragment (Joly, f. Monterosato), Palermo, 

 a fragment {Monterosato) ; 1 G3g fms. 



This species differs from O. indistincta in having fewer and larger 

 ribs with more numerous and much finer spiral stria3 ; the whorls 

 are not so convex, and the suture is consequently slighter or shallower. 

 But I must admit that it is not a satisfactory and well-established 

 species. 



I 30. Odostomia flexuosa 1 , Jeffreys. (Plate XXVI. fig. 10.) 



Shell oblong, rather thin, semitransparent, and glossy : sculpture* 

 sharp and flexuous longitudinal ribs, of which there are about 20 on 

 the last whorl and 15 on the next or penultimate whorl ; these 

 commence in a nodose and abrupt manner from just below the suture, 

 and almost disappear at the periphery, where they are crossed by a 

 few spiral strife : colour white : spire turreted ; apex truncated : 

 whorls 5, compressed ; the last occupies more than half the shell 

 with the mouth placed upwards : suture narrow but distinct, nearly 

 straight : mouth oval, inflected above and rounded below : outer lip 

 angular above and gently curved in the middle : inner lip filmy ou 

 the upper part and reflected on the lower part of the pillar, behind 

 which is a small and narrow chink. L.0'1. B. 0*05. 

 'Porcupine' Exp. 1870: Med. St. 55. Two specimens. 



'. 31. Odostomia clathrata, Jeffreys. 



O. clathrata, Jeffr. in Ann. & Mag. N. H. 2nd ser. ii. p. 345 : 

 B. C iv. p. 148 ; v. p. 212, pi. lxxiv. f. 9. 



'Porcupine' Exp. 1870: Med. St. Adventure Bank (fragment). 



Distribution. Birterbuy B., Connemara (Barlee and J. G. J.), 

 throughout the Mediterranean and Adriatic, Madeira (Watson), 

 Canaries (McAndreiv) ; 20-25 fms. 



Fossil. Miocene: Vienna Basin (Coll. Homes in mus. Vind.)! 

 Pliocene : Monte Mario and Sicily. 



v 32. Odostomia scalaris, Philippi. 



Melania (afterwards Chemnitzia) scalaris, Phil. Moll. Sic. i. p. 157, 



t. ix. f. 9. 



O. scalaris, B. C. iv. p. 160 ; v. p. 213, pi. lxxv. f. 7, and var. 8. 



'Porcupine' Exp. 1870: Atl. St. Vigo B. ; Med. 45, Rasel 

 Amoush. All typical specimens. 



Distribution. Typical form : Norway (McAndreiv), Unst, in 

 Shetland (J. G. J.), western and southern coasts of England and 

 Ireland, northern and western coasts of France, Spain and Portugal, 

 Mediterranean and Adriatic, Madeira ; 8-108 fms. Var. rufescens. 

 Finmark southwards to the Hebrides and county Antrim ; 10-90 



fms. 



Fossil. Pliocene : Coralline Crag and Italy. Post-tertiary : 

 Norway (var. rufescens) ; 70-100 feet. Not Odontostoma scalaris of 

 Sandberger from the Mayence Bnsin. 



1 Sarins flexuous ribs. 



