Dr. 0. A. L. M'drch — On the Crag of Iceland. 397 



20. Nassa monensis, Forb., Jeffr., verhotinus. 



Testa conica, anfr. planiusculis conferte costatis ; costas circiter 

 29 in anfr. ultimo, bifidee obsoletee arcuatse ; spiraliter liratas 

 unde interstitiis costarum foveolatis. Long. 12 mm., diam. 

 5^ mm. ; spirge 7 mm. long. 



Wassa labrosa, "Wood, tab. 3, fig. 8, quoad formam sed non sculptura. 



Nassa Cuvieri, Payr. non aisimilis. 



I have compared four specimens from Mr. G-udman, and from 

 Spengler's collection one specimen. I consider it very different 

 from N. monensis, Forb., which I, however, do not know from 

 autopsy. 



21. Pleurotoma {Ischnula) turricula, Mtg. 



Clavatula turricula, ■Wood, tab. viii., fig. 13, Winkler, p. 211. 

 Very large specimens, 20 mm. long, 8 mm. in diameter ; spirse, 

 10 mm. 



22. Pleurotoma (Ischnula), sp. 



Clavatula concinnata, "Wood, p. 61, tab. vii.,fig. 11, aff. vel. C. nebula, fig. 10. 

 One specimen is 19f mm. long, 8 mm. in diameter; spirse, 11 mm. 

 long. 



23. Pleurotoma (Bela) rufa, Mtg. Wood. 



13 J mm. long, 5^ mm. in diameter ; spirse, 7 mm. long. 



24. Pleurotoma (Ischnula) Treveylliana, Leach. 



Circ. 11 mm. long; 5 mm. in diameter; anfr. ult., 5 mm. long. 



25. Admete viridula, Fabr. 

 One specimen, 10 mm. long. 



26. Valuta, sp. 



Fragmentum spirse. Anfr. tres primi solum adsunt : anfr. 2 

 primi Isevigati, mamillam formantes ; anfr. tertium undatim 

 plicato-costatus. Sutura profunda. Diam. 3 mm. 

 Cancellaria coronata, Wood, tab. vii., fig. 18, gives an idea of it. 



27. Trochus amphihola, nov. sp. 



Testa subperforata conica obtuse-angulata. Anfr. convexiusculi, 

 quadrilirati, interstitia lirarum lirulis 2-3 intercalantibus. Labio 

 subreflexo incrassato liris 2-3 obsoletis. Periomphalum declivi 

 angusto. Striae incrementi regularibus membranaceis. Axis, 

 8 mm. ; long, 13 mm. ; diameter maj., 12 mm. ; min., 10 mm. 



(Gibhida) very like Margarita cinerea, Couth., but decidedly a 

 Trochus. 



28. Trochus (Oibbida). 



Testa convexo conica, imperforata, carina subprominula acutiuscula. 

 Anfr. declivi planiusculi supra carinam liris 5 bijDartitis; basis 

 conferte lirulata interstitiis lirarum carinam versus lirula inter- 

 calante. Strife incrementi confertse, obliquse, regulares, fili- 

 formes. Axis, 5 mm.; long, 8 mm. diameter maj. 9 mm.; 

 min. 7 mm. ; alt anfr. penult, 2^ mm. Allied to Tr. divari- 

 catus, L. One specimen. 

 **29 Patella (Patina) pellucida, L. ? 

 Patella leevis, Winkler, I.e. p. 211. 

 The surface is, according to Dr. Winkler, smooth, the concentric 

 lines of growth are scarcely to be seen by the lens. Length 

 9^ mm,, and 6 mm. broad. 



