614 THE VOYAGE OF H.M.S. CHALLENGER. 



that Mr Gwyn Jeffreys, in the words " proceeds from the outer margin," does not by margin signify 

 face ; and further only means that the ossicle projects beyond the edge in a general way, not using 

 outer in opposition to columellar. 



In addition to Mr Smith's careful description, it may be well to record that the teeth of the 

 genus do not seem to differ materially from those of Rissoa. It is true that the sketch of them 

 which I made for my own use omits the small outmost or third tooth on either side, but such an over- 

 sight is apt to occur in the case of specimens preserved in spirit and not examined with special care. 



Species. 



1. Eatoniella caliginosa, E. A. Smith. 2. Eatoniella subrufescens, E. A Smith. 



1. Eatoniella caliginosa (E. A. Smith). 



Eatonia caliginosa, E. A. Smith, Ann. and Mag. Nat. Hist., 4th ser., July 1875, vol. xvii. p. 7. 

 Eatoniella caliginosa, Dall, Bull. U.S. Nat. Mus., 1876, vol. ii. p. 43. 



„ „ E. A. Smith, Moll. Kerguelen, Phil. Trans. Roy. Soc. Lond., vol. 168, 1879, p. 9 



(separate impression), pi. is. fig. 9. 

 „ ,, Studer, Fauna Kerguelensland, Archiv f. Naturgeseh., 35th year, vol. i. p. 129, 



No. 36. 



January 19-20, 1874. Eoyal Sound, Kerguelen. Shore. 

 Habitat. — Kerguelen (E. A. Smith). 



2. Eatoniella subrufescens (E. A. Smith). 



Eatonia subrufescens, E. A. Smith, Ann. and Mag. Nat. Hist., 4th ser., 1875, vol. xvii. p. 71. 

 Eatoniella subrufescens, E. A. Smith, Moll. Kerguelen, Phil. Trans. Roy. Soc. Lond., vol. 168, 1879, 



p. 9 (separate impression), pi. ix. fig. 11. 

 ,, „ Studer, Fauna Kerguelensland, Archiv Naturgeseh., 35th year, vol. L p. 129, 



No. 37. 



Station 149b. January 17, 1874. Lat. 49° 28' S., long. 70° 30' E. Off Koyal 

 Sound, Kerguelen. 25 fathoms. Volcanic mud. 



Habitat. — Kerguelen (E. A. Smith). 



It may be worth noticing that this shell is scored with microscopic spiral lines, of which on the 

 body-whorl there are about six to the Tuth inch. 



4. Rissoina, d'Orbigny, 1840. 

 Species. 



1. Rissoina chesnelii (Mich). 6. Rissoina triticea, Pease. 



2. Rissoina cincta, Angas. 7. Rissoina scalariformis, n. sp. 



3. Rissoina dubiosa (C. B. Adams). 8. Rissoina triangularis, n. sp. 



4. Rissoina miranda, A. Adams. 9. Rissoina mercurialis, n. sp. 



5. Rissoina reticulata (?) (Sow). 10. Rissoina honoluluensis, n. sp. 



11. Rissoina transenna, n. sp. 



