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



ECHINODERMATA 



23 



marginal plates. They vere likewise absent from the area 

 nearest the marginal plates. As will be seen from the 

 foregoing table the madreporic plate was situated nearer 

 to the centre of the disc to its border, the distance from 

 the centre being about one third of the disc-radius. 



No pedicellariae could be discovered in the two smallest 

 specimens. But in the remainder on the other hand 

 several were found. They were present in the abactinal 

 as well as in the dorso-marginal plates, while I did not 

 succeed in finding them in the ventro-marginal or actinal 

 plates. Perrier states, however, that pedicellariae are found 

 scattered on the actinal plates. They are very small and 

 similar to those in Pentagonaster granulans, and are 

 found on the radial as well as the interradial plates, and 

 in the centre of the plates as well as along the border. 



The adambulacral papillae are arranged in 3 — 4 rows, 

 among which one or several isolated papillae are some- 

 times found. The furrow papillae are the largest, while 

 those in the outermost row are shortest and similar in 

 form to the granules of the adjoining actinal plates. As 

 in Pentagonaster granulans the number of papillae found 

 in a row varied greatly. In some of the middle adambula- 

 cral plates of the smallest specimen there were thus: 3—3 

 _3, 4—3—2—3, 3—1—2—3 and so on; in the 81 mm. 

 specimen: 6—4 -1—5, 6—5—6, 6—4—2—5, 5—1—5— 

 7 — 2, 5—5 — 5 and so on; and in the 130 mm. specimen: 

 5—5—4—6, 4—5—1—4—2—6, 4—4—5—4 and so on. 

 In the three specimens from stat. 25 B the adambulacral 

 plates had three row of papillae with 5 to 6 papillae in 

 the furrow-row and 3 to 6 in the remaining rows. Some 

 plates had besides an indefinite fourth row with 2 to 3 

 papillae. In some specimens the papillae behind the furrow- 

 row were gathered in a cluster without definite order, 

 instead of being arranged in rows. 



The colour of the specimen from stat. 95 preserved 

 in formol was orange-yellow on the abactinal and yellowish 

 white on the actinal surface. The papulae were white. 

 The remaining specimens preserved in alcohol, had lost 

 their colour entirely. 



With respect to the interpretation of Pentagonaster 

 dentatus I agree entirely with Farran, who maintains 

 that P. perrieri Sladen s. grandis Perrier and P. concin- 

 nus Sladen are identical with it. P. dentatus is therefore 

 a North Atlantic species and is known from the western 

 as well as from the eastern side. It was first found by 

 the "Blake" in the West Indies, between Grenada (12° N.) 

 and 19° 7' N., at 75 to 2196 m. The "Talisman" later 

 obtained it off the west coasts of Morocco and Spain 

 (20° 32 —38° 38' N.), 930—1590 m., the "Caudan" in the 

 Bay of Biscay, 950—960 m.; the Prince of Monaco in 

 several localities between the Cape of Verd Is. and the 

 Bay of Biscay (15° 17'— 45° 9' N.) 1095—1804 m., and 



English expeditions in several localities off the west coast 

 of Ireland, 628 — 1455 m. While thus P. dentatus on the 

 west Atlantic side was known only between 12° and 19° 

 T N. it was found on the east Atlantic side between 

 15' 17' and 51" 35' N. Its bathymetrical distribution is 

 from 75 to 2196 m. 



Luidia ciliaris Philippi. 

 Asterias ciliaris Philippi, Arch. f. Naturgesch., vol. 3, 1X37, p. 70. 



l %, stat. 3, 49 32' N. 10 49' W., 184 m., fine sand, temp. 10.3 

 Cel. One specimen. 



20 /. 5> stat. 37, 26 c 6' N. 14 33' W., 39 m., shingle, temp. 15.6 Cel. 

 One specimen. 



28 /7, stat. 94, 50° 13' N. 11' 23' W., 1 m. net, surface. 11 spec- 

 imens, and 1 m. net, 200 m. wire. 4 specimens. 



°/8— 7 /x, stat. 101, 57" 41' N. 11 48' W., 1 m. net, 200 m. wire 

 and 3 /i m. net, 600 m. wire. From each gear one specimen only was 

 obtained. 



The specimens from stat. 94 and stat. 101 were young, 

 with remnants from the larval stage adhering. The largest 

 of them had a diameter of 3.7 mm. 



The specimens from stat. 3 and stat. 37 were on the 

 contrary fully-developed. The specimen from stat. 3 

 measured: arm-radius 270 mm., disc-radius 32 mm., breadth 

 of arm at base 28 mm., r : R = 1 : 8.44. In the individual 

 from stat. 37 these measurements are 182 mm., 20 mm. 

 and 16 mm. respectively, r : R = 1 :9.i. 



Both specimens belong to the variety normani Lud- 

 wig. Likewise three specimens taken by the "Michael 

 Sars" in 1902 and 1906 in the northern part of North 

 Sea 1 ) belong to this variety. 



Luidia ciliaris is common in the western part of the 

 Mediterranean, but apparently absent in the eastern part 

 (cfr. Ludwig 2 ). It further occurs off the west coasts of 

 Africa and Europe from the Cape Verd Is. to the Faroe 

 and Shetland Is. In the North Sea it is known only 

 from the north-western part, where it was collected by 

 the "Michael Sars" and the "Poseidon" between 58* 2' 

 and 6T 14' N. and between 2° 21' E. and ¥ 19' W., 70 

 — 215 m. and it was altso taken off and on by the bank- 

 fishermen; also from the eastern coasts of Scotland and 

 England, where it ranges as far south as Scaborough. 

 Siissbach and Breckner 3 ) statements "An der norwegischen 

 Kuste scheint sie selten aufzutreten und nur an ihren 



1 ) The localities are: 



1902, stat. 50, 61° 14' N. 2° 13' E., 155 m. temp. 6.78° Cel. 

 1906, „ 287, 60° 52' N. 3 36' E., 130 m. . 7.6° , 

 1906, „ 299, 60° 52' N. 0° 18' E., 130 m. „ 6.5° „ 



2 ) Ludwig: Die Seesteme des Mittelmeeres, Fauna und Flora 

 des Golfes von Neapel, vol. 24, 1897, p. 80. 



3 ) Siissbach & Brekner: Die Seeigel, Seesteme und Slangensterne 

 der Nord- und Ostsee. Wissensch. Meeresuntersuch. N. F. Abt. Kiel, 

 Bd. 12, 1910, p. 210. 



