some neio and peculiar Mollusca. 333 



and Canada. Captain Feilden found it in the recent Arctic 

 Expedition, in a raised sea-bed in Kane Valley, in 82° 33' north 

 latitude. P. Trevelyana has a narrower base, and is therefore 

 more fusiform than P. exarata ; and the spire is shorter than 

 that of P. turricula^ which gives the present species a more 

 oval shape. It is the P, reticulata of Brown (1827), and P. 

 decussatum of Macgillivray. Brown's name has priority of 

 all the others, but may be regarded as obsolete. 



Bullidse. 



Gyliclma alba, Brown. 



Voharia alba, Brown, 111. Conch. G, B. & I. pi. xxxviii. f. 43, 44 



(1827). 



Station 1, 175 fms. ; 4, 20 fms. ; 6, 410 fms. (living) ; 

 Holsteinborg, 12 fms. 'Lightning' Expedition, 189 and 

 530 fms. Swedish Arctic Expedition, 1868, 1400 fms. ! ' Por- 

 cupine ' Expedition, 1869, west coast of Ireland, 420-1366 fms. 

 (living at the last-mentioned depth) : 1870, Bay of Biscay, 

 795-994 fms. ' Challenger ' Expedition, off the Azores, 450 

 and 1000 fms. Norwegian Arctic Expedition, 1876, 1180 fms. ! 

 From Cape York to Cape Cod, and from Spitzbergen and 

 Novaya Zemlya to Shetland, at depths of from 7 to 300 fathoms. 

 West coast of North America (P. Carpenter). North Japan, 

 35-48 fms. (St. John) ! Fossil in the Norwich Crag, the older 

 Pliocene of Sicily, and the newer Tertiaries of Great Britain, 

 Scandinavia, and N.E. America ; Arctic Expedition, 1875-6, 

 Kane Valley, 82° 33' north latitude (Feilden) ! 



I mention this common arctic species to show the range of 

 hydrographical distribution and depth. In some specimens 

 the crown is more or less truncated ; and in others the minute 

 and close-set spiral striae are absent. 



It is the Bulla triticea of Couthouy, B. corticata of Moller, 

 and C. nucleola of Reeve. 



Utriculus obtiisuSj Montagu. 



Bulla oUusa, Mont. Test. Brit. (1), p. 223, t. 7. f. 3 (1803). 

 Var. ttirrita. Bulla twrtta, Moll. Ind. Moll. Groenl. p. 6. 



Body milk-white, semitransparent, covered with microscopic 

 tubercles: head snout-shaped, prominent, being of. the same 

 breadth as the foot in front, so as to appear united with it : 

 tentacles triangular and broad, separated by the head-flap : eyes, 

 none perceptible : foot large, wedge-shaped in front and cloven 

 behind. 



Godhavn, 5-20 fms. ; Station 5, 57 fms. ; Holsteinborg, 

 10 fms. 



