PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 677 



PI is composed of 21 to 23 segments, of which those in the distal half are about 

 three times as long as broad with the distal edges expanded, spinous, and overlapping; 

 the second and third segments have dorsal carinate processes. The pinnule is extreme- 

 ly slender, like the corresponding pinnule of T. cubensis. P 2 is at the base almost as 

 stout as Pj, but it reaches only half the length of that pinnule; it is composed of 13 

 segments, of which the second and third bear carinate processes and the distal become 

 greatly elongated; a gonad extends from the third to the sixth segments. The three 

 following pinnules are similar; on those succeeding, the gonad begins to decrease in 

 size, disappearing after P 7 . From this point onward the pinnules become very slender 

 with much elongated segments, and increase in length. 



Notes. The preceding description is based entirely upon the type specimen which 

 I studied in the Paris Museum. 



In the larger specimen from Ingolf station 18 the arms are 35 mm. long, and in 

 the smaller the arm length is 30 mm. There are only 15 to 16 cirrus segments; but 

 all the peripheral cirri are lacking. 



Localities. Travailleur station 13; 2030 meters [A.H.Clark, 1911] (1,P.M.). Type 

 locality. 



Porcupine station 17A, 1870; off Cape Carvoeiro, Portugal (lat. 3939' N., long. 

 939' W.); 1353 meters; temperature 9.61 C. [Wyville Thomson, 1872, 1873; P. H. 

 Carpenter, 1884, 1888; A. H. Clark, 1923]. 



Travailleur station 55, 1880; Bay of Biscay, north of Bilbao, Spain Gat. 4335'40" 

 N., long. 246'30" W.); 1081 meters; mud; July 27, 1880 [Marquis de Folin, 1887]. 



Travailleur station 56, 1880; Bay of Biscay, north of Bilbao, Spain (lat. 4336'45" 

 N., long. 245'15" W.); 960 meters; mud; July 27, 1880 [Marquis de Folin, 1887]. 



Ingolf station 18; southwest of Iceland (lat. 6144' N., long. 3029' W.); 2075 

 meters; temperature 3.0 C. (2 U.S.N.M., E.1092; C.M.). 



Geographical range. From the coast of Portugal and the Bay of Biscay north- 

 westward to southwest of Iceland. 



Bathymetrical range. From 960 to 2075 meters; the average of 5 records is 1499 

 meters. 



Thermal range. The two records are 3.0 C. and 9.61 C. 



History. In his account of the work of the Porcupine Sir Wyville Thomson 

 (1872) mentioned that more or less complete fragments of Antedon sarsii were obtained 

 at nearly every one of the deep hauls from the Faroe Islands to Gibraltar. The only 

 definite Porcupine record ever published for the region south of the British Isles, 

 however, was for Porcupine station 17A, 1870, off Cape Carvoeiro, Portugal, in 

 1353 meters (P. H. Carpenter, 1884, 1888). 



In 1887 the Marquis de Folin mentioned Antedon sarsii as having been dredged 

 near Santander, Spain, in 960 and 1081 meters, which depths correspond with Tra- 

 vailleur stations 55 and 56, 1880, in the southern part of the Bay of Biscay. 



When visiting the Paris Museum in 1910, I found a small but well-preserved 

 individual of a new species of Trichometra with the label "Expedition du Travailleur, 

 Dragage XIII; profondeur 2030 metres." This I described as new under the name 

 of Trichometra delicata. As yet I have not been able to find out the exact location 

 of this station; but I believe that it was one of those occupied on the cruise in 1882, 

 located on the coast of northern Spain or Portugal. 



