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



ECHINODERMATA 



33 



Ophiura tessellata Verrill. 

 Ophioglypha tessellata, Verrill, Proceed. U. S. Nat. Museum, vol. 17, 



1894, p. 290. 



8 /e. Stat. 53, 34° 59' N., 33" V W., 2615—2865 m., yellow hard 



clayish mud, temp. 3° Cel. Two specimens. Diameter of disc 18 mm. 



ls / 7 . Stat. 88. 45° 26' N., 25° 45' W., 3120 m., sand and yellow 



mud, temp. 2.5 Cel. 15 specimens. Diameter of disc 9 — 24 mm. 



This species was first described from the east coast 

 of North America, where it was taken at a depth of 

 458—3720 m., most abundantly between 730 and 1820 m. 

 It was later obtained by the Prince of Monaco in the 

 Bay of Biscay, off Portugal, the Azores and the Cape 

 Verde Is., 1267 — 2870 m. Ophiura tessellata is thus a 

 North Atlantic species, ranging between about 39° and 

 41° 39' N. on the western side and between 14° 47' and 

 46° 52' N. on the eastern side. The bathymetrical 

 distribution is 458—3720 m. 



Ophiura affinis Liitken. 

 Ophiura affinis Liitken, Kgl. danske Vidensk. Selsk. Skrifter, Nat. 

 math. Afd., R 5, B 5, 1859, p. 45, tab. 2, fig. 10. 

 V Stat. 1, 49° 27' N., 8° 36' W., 146 m., fine sand, temp. 9.57° 

 Cel. One specimen. 



2 %. Stat. 38, 26° 3' N., 14° 36' W., 77 m., red sand and shingle. 

 Three specimens. 



27 /7. Stat. 96, 50° 57' N., 10° 46' W., 184 m., temp. 11° Cel. 

 6 specimen. 



Ophiura affinis is a North Atlantic species, occurring 

 off the coasts of North America, as well as of Europe, 

 where it ranges as far north as the Trondhjemsfjord and 

 south to the Mediterranean and Cape Bojador. 



Ophiocten sericeum Forbes. 

 Ophiura sericea Forbes, Sutherlands Journ. Voy. Baffins Bay, vol. 2, 

 1852, App. p. 215. 

 3 %. Stat. 70, 42° 59' N„ 51° 15' W., 1100 m., temp. 3.7° Cel. 

 Numerous smaller specimens. Diameter of disc 2—5 mm. 



Ophiocten sericeum is a boreo-arctic species which 

 has its main distribution and attains its greatest development 

 within the Arctic regions, but which is also widely distributed 

 within the boreal area. It was occasionally met with in 

 the Atlantic region proper, to which stat. 70 must belong, 

 although there were found such boreal or boreo-arctic 

 animals as Terebratullna septentrlonalls, Pllldium radlatum, 

 Buccinum undatum, Scaphander puncto-slrlatus etc. In 

 the last-named region it was thus taken by the "Thor" 

 in 1903 in deep water south of Iceland (stat. 164, 62° 

 10.8' N., 19° 36' W., 2128 m., and stat. 166,62° 57' N., 

 19° 58' W., 947 m.) 1 ) 



'). Schmidt: Fiskeriundersogelser ved Island og Fseraerne Som- 

 meren 1903, p. 22 & 23. 



Ophiocten latens Koehler. 

 Ophiocten latens Koehler, Ophiures, Exp. Sci. du "Travailleur" et du 

 "Talisman", 1906, p. 267, tab. 18, figs. 11 & 12, 

 ' S A. Stat. 10, 45° 26' N., 9° 20' W., 4700 m., yellow mud, temp. 

 2.56° Cel. Two specimens. 



Of one of them the under surface of the disc only 

 was existant, of the other the entire disc and a portion of 

 one arm. This last-named specimen, whose diameter of 

 disc was 9 mm and which consequently equalled in size 

 the specimens from the "Talisman", agrees perfectly with 

 the description, that Koehler gives of them. In the other, 

 somewhat smaller specimen the form of the mouth-shields, 

 the lateral mouth-plates and the innermost ventral arm- 

 plates are similar to the "Talisman" specimens and I 

 therefore also refer this specimen to Koehler's species. 



Ophiocten latens was previously found only by the 

 "Talisman" between the Azores and Portugal (42° 19' N. 

 23° 26' W., 4060 m.) 



Ophiochiton ternispinus Lyman. 



Ophiochiton ternispinus Lyman, Mem. Mus. Comp. Zool., vol. 10, 



no. 6, 1883, p. 255, tab. 5, figs. 67— 69. 



6 /8- 7 /s, stat. 101, 57°41'N. 11°48'W., 1853 m., hard clay, temp. 

 3.3° Cel. One specimen. 



Diameter of disc 23 mm. The arms, which were torn 

 off, were 4 mm. broad at the border of the disc. The 

 largest arm-spines measured 3.5 mm. Five to six mouth- 

 papillse. The specimen is almost twice as large as the 

 type-specimen, which had a disc-diameter of 12 mm. It 

 differs from the latter by proportionately broader mouth- 

 shields (length 2.7 mm., breadth 2.2 mm.) but agrees with 

 it in other respects. The colour of the specimen preserved 

 in alcohol was brownish gray. 



One specimen of Ophiochiton ternispinus was found 

 in 1869 by the "Porcupine" SW. of Ireland (stat. 42, 

 49° 12' N. 12° 52' W., 1577 m., 4.3' Cel.) It was later taken 

 by Wandel off the west coast of Greenland (66°49'N. 

 56°28'W., 442 m.) The species is therefore most prob- 

 ably distributed at the great depths throughout the northern 

 part of the North Atlantic. 



Ophiomusium lymani Wywille Thomson. 

 (PI. 5, figs. 8—10). 

 Ophiomusium lymani Wywille Thomson, The Depths of the 

 Sea, 1873, p. 173, figs. 32 & 33. 



% stat. 24, 35° 34' N. 7° 35' W., 1615 m., yellow mud, temp. 

 8° Cel. One specimen. 



7/5 stat. 25 A., 35° 36' N. 8° 25' W., 2300 m., yellow mud. 20 

 specimens. 



8/ 5 Stat. 25 B, 35° 46' N. 8° 16' W., 2055 m., yellow mud. 

 Common. 



GRIEG:— ECHINOD 5. 



