516 EEV. H. BOOG WATSON ON THE 



In the B.M. this is given as from "Zanzibar and China." In 

 Beeve's C. I. this species is given as =D. politum, Desh. (nee L.), 

 and z=D. Laviarchii, Chemn. 



11. Dentalitjm compeessum, W. 



St. 24. Mar. 25, 1873. N. of Culebra Island, St. Thomas, 

 Danish West Indies. 390 fms. Mud. 1 specimen. 

 Shell. — Compressed between its concave and convex curves to the 

 extent of 0"016 in. ; bent, as in young shells, a little more 

 towards the apex, and the curve greater on the convex slope, 

 slightly carinated on each side. Sculpture. Faint, but very 

 regular, longitudinal striae, about O'Ol in. apart, apparently in 

 the texture of the shell, which thus seems to be built up o£ 

 minute, square-faced rods laid side by side. Crossing these 

 at right angles are sharp, irregular scratches in the line of 

 growth, nearly circular, but bent a little forwards on the con- 

 cave curve. L. 0*45. B. at mouth 0-05 (least), 0*06 (greatest), 

 apex 0-019. 



It is very possible that this may be a SipJiodentalium, as Mr. 

 Gwyn Jeffreys suggested ; but in the absence of the animal and 

 the rubbed condition of both ends of the shell it is impossible to 

 say. It resembles S. tetragonum, Brocchi, more tlian any other ; 

 but the want of the angles, the different character of the longitu- 

 dinal striae, and, above all, the compression, separate it completely. 

 There is only the one dead discoloui'ed and somewhat rubbed 

 specimen. 



12. Dentalium subterfissum, Jeffr. ; J. Gwyn Jeffreys, Ann. 

 ^ Mag. Nat. Hist. 1877, xix. 154. 



St. 78. July 10, 1873. Lat. 37° 24' N., long. 25° 13' W. Azores. 

 1000 fms. Globigerina-ooze. 10 specimens or fragments. 



St. 85. July 19, 1873. Lat. 28° 42' N., long. 18° 6' W. Palma, 

 Canaries. 1125 fms. Volcanic sand. 1 fragment. 



St. 120. Sept. 9, 1873. Lat. 8° 37' S., long. 34= 28' W. Per- 

 nambuco, S. America. 675 fms. Mud. 2 fragments. 



A species peculiar as having the apical slit on the concave 

 curve. The animal is unknown. 



Mr. Gwyn Jeffreys got it in the ' Porcupine,' 1869, off the W. 

 coast of Ireland, in 1180-1476 fathoms, and in the ' Valorous ' at 

 St. 12, in 1450 fathoms. 



