REPORT ON THE PTEROPODA. 
77 
1850. Diacria trispinosa , Gray, Catalogue of the Mollusca iu the Collection of the British 
Museum, pt. ii., Pteropoda, p. 10. 
1850. Diacria mucronata, Gray, Ibid., p. 11. 
1853. Hyalsea reeviuna, Dunker, Index Molluscorum, &c., p. 2, pi. i. figs. 17-20. 
1858. Plearopus trispinosus , A. and H. Adams, The Genera of Recent Mollusca, vol. ii. 
p. 611 . 
1858. Pleuropus mucronatus, A. and H. Adams, Ibid., vol. ii. p. 611. 
For description and figures, see Boas, Spolia atlantica, p. 94, pi. i. fig. 3 ; pi. ii. 
fig. 14. 
Habitat. — Atlantic Ocean; from 60 15' N. (“Triton” Expedition) to 40° S. 
(Knocker), both towards the New World and towards the Old; Mediterranean (Delle 
Chiaje, Cantraine, Costa, Macdonald, &c.). 
Indian Ocean; from the Gulf of Bengal (Pfeffer) to 41° S. (Boas), and from Africa 
(Natal, Madagascar, &c.) to Australia. 
Pacific Ocean ; western portion, Yellow Sea (British Museum), China Sea (Boas), 
13° N., 156° E. (“ Vettor Pisani” Expedition); South-west Pacific (Pfeffer), Port Jackson 
(Angas); North-east Pacific to 30° N. (Knocker). 
Challenger Specimens. — I. Living specimens. 
Station VIIf., February 2, 1873 ; off Madeira ; lat. 32° 27' 0" N., long. 16° 40' 30" W. 
Station 62, June 18, 1873 ; Bermuda to Azores; lat. 35° 7' N., long. 52° 32' W. 
Station 63, June 19, 1873 ; Bermuda to Azores; lat. 35° 29' N., long. 50° 53' W. 
Station 181, August 25, 1874 ; Fiji to Paine Island ; lat. 13° 50' S., long. 151° 49' E. 
Station 230, April 5, 1875; Admiralty Islands to Yokohama; lat. 26° 29' N., 
long. 137° 57' E. 
O 
II. Deposit shells. 
Station 23, March 15, 1873 ; off Sombrero Island; lat. 18° 24' N., long. 63° 28' W.; 
depth, 450 fathoms ; bottom, Pteropod ooze. 
Station 24, March 25, 1873 ; off Culebra Island ; lat. 18° 38' 30" N., long. 65° 5' 30" 
W.; depth, 390 fathoms; bottom, Pteropod ooze. 
Station 33, April 4, 1873 ; off Bermuda; lat. 32° 21' 30" N., long. 64° 35' 55" W.; 
depth, 435 fathoms ; bottom, coral mud. 
Station 35c, April 22, 1873; off Bermuda; lat. 32° 15' N., long. 65° 8' W.; depth, 
1950 fathoms ; bottom, Globigerina ooze. 
Station 70, June 26, 1873; Bermuda to Azores; lat. 38° 25' N., long. 35° 50' W.; 
depth, 1675 fathoms; bottom, Globigerina ooze. 
Station 75, July 2, 1873; off Fayal (Azores); lat. 38° 38' 0" N., long. 28° 28' 30" 
W.; depth, 450 fathoms; bottom, volcanic mud. 
Station 76, July 3, 1873; off the Azores; lat. 38° 11' N., long. 27° 9' W.; depth, 
900 fathoms ; bottom, Pteropod ooze. 
