;M; -'TERRA NOVA" EXPEDITION. 



more than half the length of the shell: labrum thickened, with seven small denticles 

 on the inner margin, the most posterior one being the largest; eolumella with four 

 equidistant plaits. 



Length, 4 '25 mm. ; diameter, 2 '25. Labrum, 3 mm. long. 



Station 42, off Rio de Janeiro : 40 fathoms. 



This species appears to be. very like M. xi-n/nr!*, of Jousseaume,* in some respects, 

 but differs in the absence of very fine longitudinal strife. Considering the larger size 

 and absence of colour, it does not seem probable that M. scalaris is the same as 

 M. xfr/tifii. Sowerby, as suggested by Tryon.f 



G. Ain'illii dimidiata (Sowerby). 



Ancillaria dimidiatn, Sowerby, Thesaurus Conch., vol. Ill, p. 62, pi. 213, tigs. 55, 56 (1859); 

 Reeve, Conch. Icon., vol. XV, pi. X, figs. 39A-39n ; Tryon, Man. Conch., vol. V, p. 96, 

 pi. XXXIX, fig. 50, after Reeve. 



Station 42, off Rio de Janeiro : 40 fathoms. 



This species was said to be from the Red Sea, which evidently was an error, since 

 specimens of it from Rio de Janeiro are in the Museum from three different sources. 

 One example was dredged in three fathoms by J. Macgillivray during the voyage of the 

 "Rattlesnake" in 1845. A second example was obtained by Captain I). W. Barker 

 between Pai Island and Maricas Islands, off Rio de Janeiro, in 36-41 fathoms. The 

 third specimen is that from Station 42. 



It is quoted by Sowerby J as a South African species, but he does not say upon 

 what evidence. Until some confirmation of this statement can be adduced I am 

 inclined to regard it as incorrect. 



7. Prosipho cancellatus, n. sp. .S'<v p. 71. 



8. Tiii'i-ltt'fln liookt'ri, Reeve. 



Turritella liookeri, Reeve, Conch. Icon., vol. V, pi. XI, fig. 61 (1849) ; Tryon, Man. Conch., 

 vol. VIII, p. 206, pi. LXIV, fig. 9, after Reeve ; Kobelt, Conch. Cab., p. 29, pi. VI, fig. 11. 



Station 42, off Rio de Janeiro : 40 fathoms. 



The locality of this species has not hitherto been recorded, although the types 

 described by Reeve were labelled "Cape Frio," which is east of Rio de Janeiro, where 

 Captain Ross touched in June, 1843, on the voyage home from the Antarctic. The 

 species attains a considerably larger size than the specimen figured by Reeve, which 

 was only 20 mm. in length. The largest shell from Station 42 has the upper part 

 of tin? spire, broken off, but when perfect it must have been fully 3G mm. long, and 

 consisted of about nineteen whorls. 



* Revue et Mag. de Zool. 1S75, vol. XXVI, p. 1R!>, pi. VII, fig. 9. 

 f Man. Conch., vol. V, p. 26. 



{ .Marine Shells of South Africa, p. 17 (1S92). 



