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



In this shell the embryonic apex, which consists of four whorls, is sharp and narrow, and the three 

 lower whorls of the four are scored with the characteristic markings of the Clathurellas. The extreme 

 tip is very indistinctly and closely dotted with tubercles, which seem somewhat linearly arranged. 

 Dr Gwyn Jeffreys (Proc. Zool. Soc. Lond., 1873, p. 397, ut supra) says that the " point is usually 

 sharp, but sometimes blunt and button-shaped." I have seen nothing like such a variety of form 

 in the apex of any of the Challenger specimens of this species, nor indeed in any shells of the 

 whole Clathurella group. 



3. Clathurella leufroyi (Michaud). 



Pleurotoma leufroyi, Michaud, Coq. Viv. Medil, Bull. Soc. Linn. Bordeaux, vol. ii. p. 121, pi. i. 

 figs. 5, 6. 



„ inftata (not of Jan), Philippi, Enumeratio, vol. i. p. 197, pi. xi. fig. 24. 



„ leufroyi, Kiener, Iconog., p. 70, pi. xxiv. fig. 3. 



„ „ Philippi, Enumeratio, vol. ii. pp. 165, 174. 



„ „ Reeve, Conch. Icon., vol. i. pi. xvi. fig. 131. 



Mangelia leufroyi, Forbes and Hanky, Brit. Moll., vol. iii. p. 468, pL cxiii. figs. 6, 7, and pi. RR. fig. 1. 

 Pleurotoma leufroyi, Hb'rnses, Foss. Moll. Wien, vol. i. p. 373, pi. xl. fig. 16. 

 Defrancia leufroyi, Gwyn Jeffreys, Brit. Conch., vol. iii. p. 366, vol. v. p. 219, pi. Ixxxix. fig. 1. 



„ „ Weinkauif, Conch. Mittelmeeres, vol. ii. p. 132, sp. 4. 



„ ,, Gwyn Jeffreys, Medit. Moll., Ann. and Mag. Nat. Hist., 1870, 4th ser., vol. vi p. 18. 



Homotoma leufroyi, Bellardi, Moll. Terr. Terz. Piemonte, &c, vol. ii. p. 274, sp. 13. 

 Pleurotoma leufroyi, Monterosato, Enumeraz., p. 46. 

 Homotoma leufroyi, Seguenza, Form. Terz. Calabria, p. 258. 



Station 75. July 2, 1873. Lat. 38° 38' N., long. 28° 28' 30" W. Fayal, Azores. 

 450 to 500 fathoms. Volcanic mud. 



Habitat. — From Scotland to the Mediterranean, to 310 fathoms (Jeffreys), Madeira 

 (my dredgings), Canaries (M'Andrew). 



Fossil. — Miocene (Hornses), Upper Pliocene (Bellardi), Pleistocene (Weinkauff). 



4. Clathurella reticulata (Eenier). 



Murex reticulata, Renier, Tavola Alfabet. d. Conch Adriat., p. 2. 



„ echinatus, Brocchi, Conch. Foss. Subap., p. 423 (2d ed., voL ii. p. 216), pi. viii. fig. 3. 

 Pleurotoma reticulata, Philippi, Enumeratio Moll. Sicil., voL i. p. 196, voL ii. pp. 165, 174. 



„ „ Reeve, Conch. Icon., vol. i. pi. xv. fig. 122. 



Clavatula cancellata, S. V. Wood, Crag. Moll., vol. i. p. 61, pL vii. fig. 9. 

 Defrancia reticulata, Gwyn Jeffreys, Brit. Conch., vol. iv. p. 370, voL v. p. 220, pi. Ixxxix. figs. 3, 4. 



„ „ Weinkauff, Conch. Mittelmeeres, vol. ii. p. 128. 



Homotoma reticulata, Bellardi, Moll. Terr. Terz. Piemonte, vol ii. p. 268. 

 Pleurotoma reticulata, Monterosato, Enumeraz., p. 46. 

 Homotoma reticulata, Seguenza, Form. Terz. Calabria, p. 257. 



Habitat. — Mediterranean and North Atlantic, from Shetland to Madeira. 

 Fossil. — From the Middle Miocene onwards (Bellardi). 



