PART 5 A MONOGRAPH OF THE EXISTING CRIXOIDS 699 



para a classificagao dos equinodermes Portugueses, No. 4, Crin6ides, Porto, 1940, p. 9 (in key), 



p. 13. — GisLfi.v, Rep. Swedish Deep Sea Expcd., vol. 2, Zool., No. 4, 1951, p. 55. 

 Halhromrlrea Mortensb.v and Lieberkind, Die Tierwelt der Nord- und Ostsee, vol. 12, 1928, p. 



viii. 125. 

 Harthromeira Dj.^konov, Les dchinodermes des mers arctiques (in Russian), Leningrad, 1933, p. 22 



(in key). 

 Hatrometra Nobre, Ekihlnodermes de Portugal, ed. 2, 1938, p. 189. 



Diagnosis. — A genus of Bathymctrinae in which Pj is much elongated, between 

 two and three times as long as P2, composed of 30 to 40 segments, of which a few of 

 the basal are short and the remainder slender and greatly elongated; the proximal 

 brachials do not have strongly produced and prominently spinous distal ends; the 

 centrodorsal is conical with convex sides; and the proximal cirrus segments are much 

 elongated, over three times as long as the median diameter, the distal being almost or 

 quite as broad as long with overlapping dorsal borders and dorsal spines. 



Type species.— Aledro dentata Say, 1825, a synonym of Asterias tenella Retzius 

 1783. 



Geographical range. — From Chesapeake Bay northward to southwestern Greenland 

 (lat 65° 14' N.), thence eastward to Iceland, Ireland, Scotland, and the Scandinavian 

 coast from western Sweden to East Finmark (0xfjord). 



Batkymetrical range. — From 28 to 1783 meters. 



Thermal range.— From 2.00° C. to 13.89° C. 



Remarks [by A.M.C.]. — Since Mr. Clark wrote this part of the typescript, most 

 authors, including Gislen, Mortensen, and Koehler, have considered tenella and sarsi 

 to be no more than subspecifically distinct. However, since Mr. Clark himself must 

 have studied more material of these two forms than any European worker, I have made 

 no alteration to the text. No records of tenella seem to have been published in the last 

 30 years. 



KEY TO THE SPECIES OF H.\THROMETRA 



a'. Cirri with 24-33 (usually 27-30) segments; arms 76-110 (usually 85-100) mm. long (Chesapeake 

 Bay to Newfoundland; 46-891 meters) tenella (p. 699) 



a". Cirri with 14-24 (usually about 20) segments; arms rarely over 85 mm. long (from off New York, 

 in deep water, to Greenland, thence eastward to Iceland, Ireland, Scotland, and the Scandi- 

 navian coast; 28-1783 meters) sarsi (p. 711) 



HATHROMETRA TENELLA (Retzlas) 



(Sec vol. 1, pt. 1, figs. 290 (p. 262), 401 (p. 309), 509 (p. 373); pt. 2, figs. 102-105 (p. 67), 2S9 (p. 221), 



749 (p. 349)] 



Asterias tenella Retzius, Kongl. Svenska Vet.-Akad. Handl., vol. 4, 1783, p. 241 (description; St. 

 Croix).— Gmelin, Systema Naturae, ed. 13, pt. 6, 1788, p. 3166, No. 32 (Santa Cruz) — Gebatter, 

 Systematisches Verzeichniss der Seesterne, Seeigel, 1802, p. iv. — Bosc, Histoire naturelle des 

 vers, vol. 2, 1802, p. 114 (diagnosis; habitat). — Retzius, Dissertatio sistens species cognitas 

 asteriarum, Lundae, 1805, p. 33 (diagnosis; oceano Americano). 



Aledro dentata Sat, Journ. Acad. Nat. Sci. Philadelphia, vol. 5, 1825, p. 153 (description; Great Egg 

 Harbor, New Jersey).— Pourtal{:s, RuU. Mus. Comp. Zool., vol. 1, No. 11, 1869, p. 355 (after 

 Say). 



Alecto eschrichtii (not of J. MuUer, 1841) Stimpson, Synopsis of the marine invertebrate fauna of 

 Grand Manan, 1853, p. 12 (near Duck Id., 25 fms.; size and color). — LCtken, Oversigt over 

 Gr0nlands Echinodermata, 1857, p. 84 (Grand Manan). — M. Sars, Oversigt af Norges Echino- 

 dermer, 1861, p. 2. — E. C. and .\. Agassiz, Seaside studies in natural history, Boston, 1865 

 [and 1871], p. 121 (Eastport, Maine; young). — Verrill, Amer. Journ. Sci., ser. 3, vol. 23, 1882, 

 p. 248 [the 2 inverted] (after Stimpson). — Ganonq, Bull. Nat. Hist. Soc. New Brunswick, No. 7, 

 1888, p. 18 (history). 

 BB8-622— 67 46 



