JAMES A. GRIEG 



|REP. OF THE "MICHAEL SARS" NORTH 



near the same place in depths of 137 — 1211 m. The 

 "Talisman" in 1883 obtained it at two stations off the 

 west coast of Africa, in 1495 — 2330 m. In European 

 waters it has not hitherto been observed. Its discovery 

 by the "Michael Sars" off the west coast of Scotland 

 shows that Mytilimeria flexuosa must be distributed all 

 over the great depths of the North Atlantic. 



Pholadomya fragilis, n. sp. 



(figs. 5-7). 



30 e st. 70, lat. 42° 59' N., long. 51° 15' W., 1100 m. 

 temp. 3°7 C. One specimen, alt. 17 mm., lat. 18 mm., 

 crass. 12 mm. 



Both valves are of the same size and of a subtri- 

 gonal, short, arched form. The anterior region short, 

 subtruncate, with the antero-dorsal margin convex. Posterior 

 region about one and a half times the length of the 

 anterior region, somewhat cuneiformly protracted with 

 truncated tip, and the postero-dorsal margin straight. The 

 ventral margin is convex. The umbones elevated and 

 strongly inflected, so that they nearly touch. The shell 

 is white, translucent, extremely thin and fragile. It is 

 finely granulated and shows numerous fine zones of 

 growth, which are most apparent in the truncate anterior 

 region. 



Of the genus Pholadomya three species are known: 



Pholadomya loveni, Jeffr. x ) taken by the "Porcupine" 

 to the west of Portugal, 1314 m., and of Spain, 523 m., 

 also in the Mediterranean to the north of Cape Ferro, 

 2663 m. 



French and Italian expeditions have taken it in the 

 western Mediterranean, in 156 — 2227 m. The "Jose- 

 phine" obtained it near the Azores in 586 — 1098 m. 

 Subfossil it is found on the Norwegian west coast, in 

 100 — 200 m. As a fossil it has been found in the pliocene 

 strata of Sicily. 



Pholadomya africana, P. Fischer 2 ) was taken only 

 by the "Talisman" off the west coast of Morocco in 2083 

 —2324 m. 



Pholadomya arata, Verrill & Smith 3 ) was taken to 

 the south of Martha's Vineyard, U. S. A., in 126—248 

 m., and Locard records it from the west coast of Africa 

 ("Talisman" 1883, St. 80, 1130 m.). 



Of these three species Pholadomya africana is the 

 most nearly allied to Pholadomya fragilis, from which it 



1 ) Proc. Zool. Soc. Lond. 1881 p. 934 tab. 10. fig. 7. Cfr. Proc. 

 Zool. Soc. Lond. 1882, p. 686. 



2 ) Locard in: Exp. Sci. "Travailleur" & "Talisman", Mollusques 

 Test. t. 2. 1898 p. 165, tab. 7, fig. 42—45. 



*) Verrill in: Am. Journ. Sci. vol.22, 1881, p. 301, and in Trans. 

 Connect. Acad! vol. 5, 1882, p. 567, tab. 58, fig. 37, vol.6, 1884, 278, 

 tab. 30, fig. 4—6. Cfr. Locard in Op. cit p. 167, tab. 8, fig. 1- 5. 



differs slightly in form, especially as regards the antero- 

 dorsal margin. A more significant difference is found in 

 the number of longitudinal crests, Pholadomya fragilis 

 having 18, the other species only 10—12. This difference 

 cannot be discribed to difference in age, as the type spe- 

 cimen of Pholadomya africana is only slightly smaller 

 than that of the other species, measuring: alt. 15 mm., 

 lat. 16, mm. crass. 12 mm. According to Locard's draw- 

 ings Pholadomya africana appears to have a somewhat 

 coarser granulation, this feature being visible in Phola- 

 domya fragilis only under a high magnification. 



Cultellus pellucidus, Pennant. 



Solen pellucidus, Pennant, Brit. Zool., vol. 4, 1812, p. 84, tab. 66, 

 fig. 23. 

 9 U St. 1, lat. 49° 27' N, long. 8° 36' W, 146 m., 

 fine sand, temp. 9°57 C. Two young specimens, the 

 largest measuring 3.5 mm. in height and 14.5 mm. in 

 breadth. 



SCAPHOPODA. 



Dentalium ergasticum, P. Fischer. 



Dentalium ergasticum, P. Fischer, Journ. Conch, vol. 20, 1883, p. 275 



6 / 5 st. 24, lat. 35° 34' N, long 7° 35' W, yellow mud, 

 temp. 8° C. Six specimens, the three largest measuring 

 in millimetres: 



No. 1 No. 2 No. 3 



Length 80 76 71 



Breadth at base 8 9 8.5 



„ - apex 1 1.2 1.5 



Length of fissure 11 8.5 8 



Number of crests 45 44 50 



According to Locard it attains a length of 113 mm. 



Dentalium ergasticum is closely related to Dentalium 

 capillosum, Jeffr. with which species it has been identi- 

 fied, though I fully agree with Locard in regarding it 

 as a distinct species. 1 ) The most conspicuous difference 

 is that the fissure is very long in ergasticum while in 

 the other species it is short and narrow. 



D. ergasticum was taken by the "Caudan" in the 

 Bay of Biscay, in depths ranging from 400 to 1700 m. 

 The "Talisman" dredged it in 1139 to 2995 metres at 

 the Azores, where it was also taken by the Prince of 

 Monaco at a deoth of 1285 m., and the "Travailleur" 

 and the "Talisman" found it off the west coast of Africa 

 in 1235—2180 m. 



') Locard: Mollusques Test, et Brachiopodes, Res. Sci. Camp. 

 "Caudan", Fasc 1. 1896 p. 170, tab. 6, fig. 1. Cfr. Exp. Sci. "Travail- 

 leur" et "Talisman", Mollusques Test, tome 2. 1898, p. 108, tab. 6, 

 fig. 9—14. 



