REPORT ON THE CRINOIDEA. 85 



Locality. — Station 235, June 4, 1875; lat. 34° 7' N., long. 138° 0' E.; 565 

 fathoms; green mud; bottom temperature, 38° - l F. Three much mutilated specimens. 



Remarks. — It is with some hesitation that I have separated this species from the 

 preceding one. It is altogether larger and more massive than Eudiocrinus semperi, with 

 a larger and more distinctly conical centro-dorsal and more numerous cirri. The first 

 brachials have larger muscle-plates for articulation with the radials, and are more 

 trapezoidal in outline ; and as the second brachials are relatively longer than those of 

 Eudiocrinus semperi, and at the same time more trapezoidal in form, the base of each 

 arm is considerably constricted at the junction of its first two joints (PI. VII. fig. 1). 



The general proportions of the remaining arm-joints and of the pinnules appear to be 

 much the same in the two types, excepting that in the smaller Eudiocrinus semperi the 

 joints of the lower pinnules are rather longer relatively to their width than in 

 Eudiocrinus japonicus. Of the twelve arms which are preserved in three individuals of 

 the latter species, only one has the first pinnule on the left side ; while in Eudiocrinus 

 semperi this appears to be normally the case in the two antero-lateral rays. 



There are some specimens of Eudiocrinus in the University Museum at Berlin, which 

 were kindly shown to me by Dr. Hilgendorf, who had collected them in Japan. I think 

 that they are probably identical with the type just described. They have rather fewer 

 cirrus-joints, and the junctions of the first eight brachials are distinctly tubercular. The 

 tubercle between the first two is in the middle line, and those between the following- 

 joints lie alternately on either side of the arm. The three Challenger examples, however, 

 show no traces of these tubercles, with the exception of the median one, which is far 

 less marked than in the Berlin specimens. 



Genus 4. Antedon, de Freminville, 1811. 



1733. AcKaw^os, Linck, De Stellis Marinis liber singularis, Lipsice, 1733, p. 53. 



1733. Caput Medusx, Linck, Ibid., p. 57. 



1758. Asterias, Linnfeus (pars), Systema Naturae, 10th ed., Holniise, 1758, t. ii. p. G63. 



1777. Asterias, Pennant (pars), British. Zoology, 2nd ed., London, 1777, vol. iv. p. 55. 



1783. Asterias, Retzius (pars), K. Svensk. Vetensk. Akad. Handl., Ar 1783, t. iv. p. 241. 



1805. Asterias, Retzius (pars), Dissertatio, sistens Species Cognitas Asteriarum, Lundae, 1805, pp. 33-35. 



1811. Antedon, de Freminville, Bull. Soc. Philom. Paris, 1811, t. ii. p. 349. 



1813. Asteriatites, von Schlotheim (pars), Taschenbuch fur die Gesammte Mineralogie, 1813, Jahrg. vii. 

 Abth. 1. p. 68. 



1815. Alecto, Leach, Zool. Miscellany, London, 1S15, vol. ii. p. 01. 



1816. Comatula, Lamarck (pars), Histoire Naturelle des Animaux sans Vertebres, Paris, 1816, t. ii. p. 530. 



1820. Ophiurites, von Schlotheim (pars), Die Petrefactenkunde, Gotha, 1820, p. 326. 



1821. Comatula, Miller, A Natural History of the Crinoidea, Bristol, 1821, p. 128. 



1823. Comatulithes, von Schlotheim, Nachtrage zur Petrefactenkunde, Gotha, 1823, Abth. ii. p. 17. 



1825, Aledro, Say, Journ. Acad. Nat. Sci. Philad., 1825, vol. v. p. 153. 



1827. Pentacrinus, Thompson, Memoir on the Pentacrinus Europaeus, Cork, 1827, p. 10. 



