EEPORT ON THE BRACHIOPODA. 65 



FuUastra, Pinna, and Malleus, at Singapore, and at the Philippine Islands." Dr Gould 

 states, the " sculpture varies in strength ; on young specimens the radiating striae are 

 scarcely developed, in older specimens, and especially those that have had to contend 

 with irregularities in their place of attachment, the sculpture has a minutely-latticed 

 character, like the grains of a thimble, or thicker, concave or convex, according to circum- 

 stances of habitation ; and the position of the slit obviously varies with the position of 

 the vertex in the opposite valve. On a flat place of attachment the sub-incumbent slit 

 is nearly central, but when attached to a sloping or declivitous substance the vertex is 

 pressed to one side, and the slit of the under valve follows the same direction." 



APPENDIX. 



After my Eeport had been -RTitten and handed to Sir "Wyville Thomson, the Rev. R. 

 Boog Watson found among the MoUusca placed under his charge a few additional speci- 

 mens of Brachiopoda. 



Discina atlantica, King. 



Station 184. August 29, 1874. 145° 10' E. Off Australia, with Terehratula 

 ivyvillii. Depth, 1400 fathoms. Bottom temperature, 1'8° C. Sp. gr. 02. 



Crania, sp. 



Station 33. Off Bermuda. April 4, 1873. Depth, 435 fathoms. Mud. 



Among some Mollusca dredged off Bermuda, a dead incomplete valve of a small 

 Crania occurs, the only specimen of this genus obtained during the Challenger 

 Expedition. The specimen is too imperfect to warrant a specific identification. It 

 measured 4 mm. in length and breadth. 



Terebratulina cajmt-serjjentis, or cailleti. - 



Station 344. April 3, 1876. Off Ascension Island, along with Terehratula cubensis. 

 Depth, 420 fathoms. Hard ground. 



Waldheimia dilatata, Lam. 



In the article Mollusca, in the Report on the Transit of Venus Expedition, in the year 

 1874-1875, Trans, of the. Royal Society of London, vol. cxlviii. (extra volume), p. 192, 



(ZOOL. CHALL. EXP. — PART I. — 1880.) A 9 



