PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 553 



micas para a classificajSo dos equinodermes Portugueses. IV. Crin6ides, Porto, 1940, pp. 8 

 (in key), 13. — Tortonese, Bull. Inst. Oc6anogr. Monaco, No. 956, 1949, p. 14. — Gisl^n, Rep. 

 Swedish Deep Sea Expod,, vol. 2, Zool., No. 4, 1951, p. 55. — Htman, The invertebrates, vol. 4, 

 Echinodermata, 1955, p. 97 (common in deeper waters of Mediterranean). 

 Antedon {Leptotrietra) Koehler and Vaney, Bull. Mus. Hist. Nat. Paris, No. 1, 1910, p. 26. 



Diagnosis. — A genus of Zenometrinae in which the centrodorsal is conical, usually 

 about as high as broad at the base but often more or less broadly truncated and much 

 lower; the cirrus sockets are usually closely crowded, and are arranged in 2, or 2 and a 

 more or less developed third, columns beneath each radial, those in the apical third or 

 half of the centrodorsal obsolete; the cirri are long with up to 51 segments, of which the 

 longest are from 2 to 3 times as long as broad and the outer are either of similar pro- 

 portions or shorter, sometimes even broader than long and somewhat swollen dorsally; 

 much shorter apical cirri are occasionaUy present; the elements of the IBr series and 

 the lower brachials are smooth, separated or in lateral contact; all the pinnules are 

 present; Pi and Pj are similar and of the same length, slender and much elongated but 

 with 3 to 5 basal segments not longer than broad; P3 and the following pinnules are 

 much shorter. 



Geographical range. — From the Faroe Islands and western Scotland southward to 

 Madeira, and Sierra Leone, including the Mediterranean and the Sea of Marmara. 



Bathymetrical range. — From 46 to 1292 meters. 



Thermal range.— From 9.61° C. to 18.2° C. (only 4 records). 



KEY TO THE SPECIES OF LEPTOMETRA 

 [modified by A.M.C.] 



o.' Cirri very long and slender, gradually tapering to a point distally, all of the component segments, 

 except the basal, being about twice as long as broad, the outer with little, if any, modification of 

 the distal dorsal edge, so that the dorsal profile remains smooth (fig. 32,6, p. 567) ; the terminal 

 claw is almost straight; the arms are up to 165 mm. in length; the cirri may be over half as long 

 (Mediterranean and the Sea of Marmara; 55-1292 meters) phalangium (p. 553) 



a.' Cirri proportionately shorter, usually less than half as long as the arms and not evenly tapered 

 distally, composed in the proximal half of segments which are about twice as long as broad, but 

 distally the segments are nearly always shorter, the penultimate about as long as broad to half 

 again as long, rarely longer; the distal segments usually have the distal dorsal edge somewhat 

 swollen so that the dorsal profile is slightly scalloped (fig. 32,d); the terminal claw is more or less 

 curved; the arms are up to 125 mm. long; the cirri are usually 35-40 mm. long (Faroe Islands to 

 Madeira and Sierra Leone; 46-1279 meters) celtica (p. 564) 



LEPTOMETRA PHALANGIUM (J. MUller)* 



FiatTRE 32,a,& 

 [See also vol. 1, pt. 1, figs. 316 (p. 273), 381-382 (p. 301); pt. 2, figs. 290 (p. 221), 329-330 (p. 227)] 



Aledo phalangium J. MtJLLER, Monatsb. Preuss. Akad. Wiss., 1841, p. 182 (Nice); Arch. Naturg., 

 1841, vol. 1, p. 142 (from preceding); L'Institut, October 21, 1841, p. 357 (from preceding); 

 Abh. Preuss. Akad. Wiss. for 1841, 1843, p. 203.— Philippi, NeuesJahrb. Min. 1844, p. 541.— P. H. 

 Carpenter, Trans. Linn. Soc. (Zool.), ser. 2, vol. 2, 1879, p. 13 (compared with Aledo alticeps). 



Comatula {.Alecto) phalangium J. Muller, Abh. Preuss. Akad. Wiss. for 1847, 1849, p. 253 (revised 

 description). — Ludwig, Mitt. Zool. Stat. Neapel, vol. 2, 1880, p. 53 (identified). 



Comatula phalangium Dujardin and Hup£, Histoire naturelle des zoophytes, Echinodfermes, 1862, 

 p. 198 (synonymy; description; Nice). — P. H. Carpe.nter, Nature, vol. 15, 1877, p. 197 (centro- 

 dorsal compared with that of other species). — [Ludwig], Mitt. Zool. Stat. Neapel, vol. 1, 1879, p. 349 



* See also Addenda (pp. 836, 838) under 1958, 1959, 1965. 



