ATLANT. DEEP-SEA EXPED. 1910 VOL. Ill] 



BRACHIOPODA, LAMELLIBR. ETC. 



13 



Pleurotoma scalaroides, var., by Jeffreys (the "Triton" 

 in 1882, st. 8, 1171 m., -=- 1°1 C.) 1 ) 



The variety abyssicola seems to be a pronounced 

 cold-water form, only exceptionally occurring in the warm 

 area. The "Voeringen" took it at five localities in the 

 cold area of the Norwegian Sea, in depths between 640 

 and 1203 m., temperature -f- 0°7 to h- 1°3 C. According 

 to Dautzenberg and Fischer 2 ) the Prince of Monaco 

 found it in 1898 at two stations in the Norwegian Sea, 

 one of these off Lofoten in 1185 m. belonging to the 

 cold area, while the other station, between Finmark and 

 Bearen Island in 394 m., probably lies within the warm 

 area. The typical Bela scalarls on the contrary seems 

 principally to be distributed within the boreal region, 

 though it is also recorded from high arctic waters with 

 bottomtemperatures below freezing point, viz. from Spitz- 

 bergen and the Kara Sea. Of the seven stations where the 

 "Voeringen" obtained Bela scalarls, f. typlca, only one 

 belongs to the cold area, viz: st. 18, 753 m., -=- 1°0 C. 



Pleurotomella bairdi, Verrill & Smith. 



Pleurotomella bairdi, Verrill, Trans. Conn. Acad. vol. 6, 1884, p. 

 147, pi. 31, fig. 1. 



2 7v, st. 95, lat. 50° 22' N., long. 11° 44' W., 1797 

 m. One empty shell, 17 mm. high and 8 mm. broad. 

 It agrees best with the form described by Dautzenberg 

 and H. Fischer under the name of Pleurotoma polysarca. 3 ) 

 With good reason they have latter on referred both this 

 species and Bela abyssorum, Locard, to the species of 

 Verrill & Smith. 4 ) 



P. bairdi was discovered in 1883 by the "Albatross" 

 off the east coast of North America, where later on its area 

 of distribution according to Dall has been found to extend 

 between Rhode Island and Delaware in depths of 1728 — 

 4064 m. 3 ). In the East Atlantic it has been found by 

 the "Travailleur" and the "Talisman" and by the Prince 

 of Monaco in a great many localities between the Bay 

 of Biscay and Cape Verde, and also at the Azores and 

 at the Cape Verde Islands in depths of 454 to 4060 m. 



Pleurotomella thaumastopsis, Dautzenberg & H. Fischer. 



Pleurotoma thaumastopsis, Dautzenberg & H. Fischer, Mem. Soc. 



Zool. France, vol. 9, 1896, p. 424, pi. 

 16, fig. 14. 



19 U, st. 10, lat. 45°26' N., long. 9°20' W., 4700 m., 

 yellow mud, temp. 2° 56 C. One empty shell, 11.5 

 mm. high, 8 mm. broad, height of mouth 9 mm. It is 



!) Proc. Zool. Soc. London, 1883, p. 391. 



-) Res. Camp. Sci. par Albert I, Monaco, Fasc. 37, 1912, p. 42. 



3 ) Mem. Soc. Zool. de France, vol. 9, 1896, p. 422, pi. 17, 

 fig. 11—12. 



4 ) Res. Camp. Sci. par Albert I, Monaco, Fasc. 32, 1906, p. 15. 



5 ) Bull. U. S. Nat. Mus. nr. 37, 1889, p. 104. 



much larger than the type specimen, and has a relatively 

 larger diameter and mouth, but otherwise agrees both 

 in form and sculpture. 



P. thaumasotpsls was previously known from the 

 Azores only, from depths of 1165 to 1300 m. 



Cllonella delicatulina, Locard. 



Clionella delicatulina, Locard, Exp. Sci. "Travailleur" et "Talisman", 

 Mollusques Testaces tome 1, 1897, p. 222, 

 pi. 10, fig. 9—16. 

 23 / 5 , st. 41, lat. 28°8' N., long. 13°35' W., 1365 m. 



yellow mud. One empty shell, 22 mm. high and 7.5 



mm. broad, housing a pagurid. It belongs to the variety 



costulata, Locard (op. cit. fig. 15). 



C. delicatulina was previously recorded by the 



"Talisman" from the west coast of Morocco, the Azores, 



and the sea between the Azores and the Canary Islands 



in depths of 1180—4060 m. 



Clionella quadruplex, Watson. 



Pleurotoma (Clionella) quadruplex, Watson, Journ. Linn. Soc, Zool., 



vol. 16, 1881, p. 253. 



27 /t, st. 95, lat. 55°22' N., long. 11°44' W., 1797 m. 

 One empty shell 33 mm. high, 11.5 mm. broad. In 

 form and sculpture this shell agrees well with Clionella 

 quadruplex, judging from the drawings of this species 

 in Watson's monograph of the Scaphopoda and Gastropoda 

 from the "Challenger" expedition, at though the "Michael 

 Sars" specimen is more worn and damaged. 



C. quadruplex is known from the Azores, where it 

 was discovered by the "Challenger", at a depth of 1830 

 m., and where it was afterwards taken in depths of 800 

 to 4020 m., as also off the west coast of Africa in depths 

 of 930 to 2165 m. by the "Talisman" and by the Prince 

 of Monaco. 



Bathybeta nudator, Locard. 



Fig. 9—10. 



Thesbia nudator, Locard, Exp. Sci. "Travailleur" et "Talisman", 



Mollusques Testaces, tome 1, 1897, p. 218, pi. 



10, fig. 5—8. 



19 U, st. 10, lat. 45° 26' N., long. 9° 20' W., 4700 



m., yellow mud, temp. 2°56 C. One empty well-preserved 



shell, 40 mm. high, 19.5 mm. broad, height of mouth 22 



mm., breadth of mouth 12 mm. The last whorl is relatively 



thicker than in the type specimen, the height of which 



was also 40 mm., but the breadth only 17.5 mm. 



Otherwise there is agreement in form and sculpture. 



As to the nomenclature of this species I have followed 

 Kobelt, 2 ) as I am at one with him that it differs so much 



!) Report Sci. Res. Challenger, Zool., vol. 15, 1886, p. 370, 

 pi. 19, fig 7 a— b. 



-) Iconogr. scalentr. europ. Meeresconchylien, vol. 3, 1905, p. 276. 



