REPORT ON THE GASTEROPODA. 463 



higher in form, and in texture finer, it much resembles Xcnophora exuta (Reeve), of which species it 

 has the umbilicus, though not so large and open, and the circum-umbilical gemmate carina is wanting. 

 In Xcnophora exuta the agglutinated foreign bodies when present are only found round the top of the 

 spire, while the peripheral lamella has an undulating or triangularly toothed edge. In Xcnophora cari- 

 bcca, on the contrary, foreign bodies are plentifully attached to the peripheral lamella, but are entirely 

 absent from the spire ; the base is flat to convex, not at all concave, and the lines of growth are not 

 regular. M. Petit (Joe. cit.) says that in Xcnophora carihoza the base is " blanche, brilliante ; " in all 

 the four Challenger specimens the under surface of the flange is brilliant, though more or less smoky, 

 but the base of the shell is like the upper surface, only paler and more finely ornamented. The 

 " cordon concentrique " at the " contact du limbe," which Dr Fischer says is " bien prononceY' is in 

 one of the Challenger specimens very doubtfully present. 



2. Xenophora corrugata (Reeve). 



Phorus corrugatus, Reeve, Proc. Zool. Soc. LoncL, 1842, p. 163. 



,, „ Reeve, Conch. Syst., vol. ii. p. 159, pL ccxiv. fig. 5. 



„ „ Reeve, Conch. Icon., vol. i. pi. ii. fig. 6. 



Xenophora coirugata, Philippi, Conch. Cab. (ed. Kiister, Troehus), p. 346, sp. 7, pi. xlviii. fig. 1. 

 ,, „ Fischer, Kiener's Iconog. (Troehus), p. 441, sp. 11, pi. viii. 



Station 113a. September 2, 1873. Lat. 3° 47' S., long. 32° 24' 30" W. Anchorage 

 off Fernando-Noronha. 7 to 25 fathoms. Volcanic sand and gravel. 



Habitat. — Indian Ocean, Zanzibar, Ceylon, Persian Gulf, Japan, China Seas (Fischer). 



Dr Fischer considers the locality Japan as doubtful, though backed partially by Reeve's quota- 

 tion of the species from China. Dunker, however, does not acknowledge it in his Japanese Index. 



3. Xenophora helvacea, Philippi. 



Xenophora helvacea, Philippi, Conch. Cab. (ed. Kiister, Troehus), p. 343, sp. 3, pi. xlvii. fig. 1. 

 Xenophorus helvaeeus, Philippi, Zeitschr. f. Malak., 1851, p. 44, No. 41. 

 Xenophora helvacea, Petit de la Saussaye, Journ. de conch., 1857, vol. v. p. 250. 

 ,, „ Fischer, Kiener's Iconog. (Troehus), p. 432, sp. 4, pi. liii. 



Station 188. September 10, 1874. Lat. 9° 59' S., long. 139° 42' E. West of Cape 

 York. Off south-west point of Papua. 28 fathoms. Green mud. 



Habitat. — Madagascar (Petit de la Saussaye). 



Both in illustrated works and in museums there has been, as Philippi (loc. cit.) remarks, a good deal 

 of confusion between this species and Xenophora indica, Gm. Philippi, as usual, both in his 

 description and in his figures, admirably indicates the distinctions ; this is even better done by Fischer 

 in his beautiful monograph in Kiener. 



