PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 143 



grows, gradually form round it a half or entire membrane; but ova may be found which 

 from their commencement to their full maturity have no such covering at all. He 

 added Hus0en, Sognefjord, where it had been dredged by the Vfiringen, to the list of 

 known localities. 



Dr. James A. Grieg in 1895 recorded the first pentacrinoid to be observed, and hi 

 1897 he gave its occurrence in detail on portions of the Norwegian coast. In 1904 he 

 published detailed notes on its cirri and lower pinnules and described and figured the 

 ambulacral plates, at the same time comparing it minutely with related species. In the 

 same year Dr. G. Retzius described in detail the spermatozoa. 



In 1910 Dr Th. Mortensen described and figured a pentacrinoid of this species 

 which he had found at Kristineberg, Sweden; hi 1912 and again in 1913 Dr. J. A. Grieg 

 published additional detailed information regarding the occurrence of this form on the 

 coast of Norway; hi 1917 Jagerskiold noted its occurrence in Bohuslan; and in 1921 

 Dr. Mortensen in two papers gave a detailed account of the eggs and larvae, described 

 several aberrant specimens, and discussed the systematic position of the species. 



More recently, Lieberkind (1929) and Einarsson (1948) have recorded the species 

 again from Iceland and the Faroes respectively, and Terslin (1938) has established 

 that it does occur in the southern Kattegat, his specimens having been identified by 



Dr. Svend Heding. 



ANTEDON NUTTINGI (A. H. Clark) 



Antedon hagenii (part) P. H. CARPENTER, Bull. Mus. Comp. Zool., vol. 9, No. 4, 1881, pp. 154-156 

 [pp. 4-6 of separate] (Dominica to Grenada; 75-291 fms.; Barbados; Grenada). A. AGASSIZ, 

 Bull. Mus. Comp. Zool., vol. 15, reprinted as "Three Cruises of the Blake," pt. 2, 1888, p. 124 

 (Dominica to Grenada; 75-291 fms.). 



Anledon hageni (part) P. H. CARPENTER, Challenger Reports, Zoology, vol. 26, pt. 60, 1888, pp. 22, 

 54, 207, 367, 368, 373, 377 (Caribbean Islands). 



Coccometra hagenii (part) A. H. CLARK, Univ. Iowa Studies Nat. Hist., vol. 9, No. 5, 1921, p. 8 (ob- 

 tained by the Barbados- Antigua Exped.), p. 26 (Sta. 15), p. 27 (listed). 



Compsomelra nutiingi A. H. CLARK, Proc. U.S. Nat. Mus., vol. 83, 1936, p. 246 (description; refer- 

 ences; Barbados); Mem. Soc. Cubana Hist. Nat., vol. 14, No. 2, 1940, p. 140 (in key), p. 143 

 (Atlantis station 3412; notes). H. L. CLARK, Mem. Soc. Cubana Hist. Nat., vol. 15, No. 1, 1941, 

 p. 11 (Atlantis station 3412; notes). A. H. CLARK, Bull. U.S. Fish. Comm., vol. 55, 1954, p. 

 374 (Listed). 



Diagnostic features. This species seems to be most closely related to A. parriflora, 

 from which it is easily distinguished by having PI with 18 to 20 instead of 9 or 10 seg- 

 ments and P 2 stouter basally than P! and two-thirds rather than half the length of 

 the latter. The cirri are about XXX with up to 11 segments, the longest up to five 

 tunes as long as their median widths. It is larger than A. parviflora, the arms being 

 up to 40 mm. in length. 



Among the West Indian comatulids it is most likely to be confused with Antedon 

 duebeni, in which the cirrus segments are shorter, P! is basally stouter th:m P 2 and the 

 distal ends of the segments of the lower pinnules, of the brachials, and of the cirri are 

 not produced; also with Coccometra hageni, in which P t is composed of much shorter 

 segments and is of the same length as P 2 , and the cirrals, pmnulars, and lower brachials 

 do not have produced distal ends. 



Description. The centrodorsal is hemispherical or low and broadly rounded 

 conical with abroad area free of cirri and covered with relatively large papillae from the 

 center of which the low, rounded conical dorsal pole protrudes. 



