1885.] 'lightning' AND 'PORCUPINK ' EXPEDITIONS. 41 



the 'Annals and Magazine of Natural History' for October 1876 

 and March 1883. I have verified the description. 



3. Adeorbis fragilis, G. O. Sars. 



A.fragiHs, G. O. Sars, Moll. reg. arct. Norv. p. 213, t. 22. 

 f. 19, a-c. 



•Porcupine' Exp. 1870: Atl. 16, 27. 



Distribution. Loffoden I. and western coast of Norway ; 60- 

 190 fms, 



Sornewliat resembling A. pulchralis of the Coralline Crag, but of 

 a tliiiiner texture, the s|)ire more raised, the whorls more convex, 

 the sculpture much slighter and irregular, and the umbilicus more 

 open. 



Tiiis and the next species appear to be closely allied to Fossarus, 

 the position of which genus has not been satisfactorily determined : 

 it was placed witii Solarium by Woodward, in the Littorina family. 

 According to Troschel, the dentition of Fossarus agrees in some 

 respects with that of Turritella. 



4. Adeorbis depressus, Seguenza. (Piute IV. figs. 8, 8 a.) 



Fossarus depressus, Seg. Bull. Real. Comit. Geol. Ital. 1874, 

 fasc. ii. p. 382. 



'Porcupine' Exp. 1870 : Atl. St. 24, 30. 



Distribution. Algiers {IVeinkauff^, a% Fossarus crossei of Kleiak)!, 

 Strait of Messina (^Seyuenza and Granata) !, Palermo (^Monterosato), 

 Brindi?i {Aradas)\ ; 11-108 fms. 



Fossil. Pliocene : Messina {Seguenza). 



This pretty little shell, examined under a microscope, is exquisitely 

 sculptured by close-set longitudinal folds and intermediate spiral 

 striae, or thread-like lines. Some specimens have the whorls more 

 or less disunited in cornucopia fashion. It seems to connect Adeor- 

 bis with Fossarus. 



According to tlie catalogue of Kleiak's collection of Dalmatian 

 shells his Natica crosseana is a synonym of Fossarus petitianus, 

 Ti\im=- Stomatia azonea, Brusina. 



Fossarus reticulatus, S.Wood. (Plate IV. fig. 9.) 



Lacuna reticulata, S. Wood, Mon. Crag Moll. vol. i. p. 122, t. xii. 

 f. 10, and t. XV. f. 12. 



Fossarus interjunctus, Jeffreys, MS. 



Shell oblong, rather solid, semitransparent, lustreless ; sculpture, 

 numerous, curved, and rather sharp longitudinal ribs which cover 

 the last or body-whorl ; these and their interstices are crossed by 

 more numerous close-set and minute spiral striae, but not so as to 

 cause cancellation ; the upper whorls are quite smooth : colour hght 

 yellowish brown : spire somewhat elongated or extended, and ending 

 in a blunt point : ivhorls 4, rather convex, the last disproportionately 

 large, the uppermost bulbous and intorted : suture deep : mouth 

 oval: oaf er ?J/3 thick : inner lip attached to the pillar: umbilicus 



