A MONOGRAPH OF THE EXISTING CRINOIDS 401 



He redescribed the species in 1849 in the following terms: A small comatulid 

 with 13-15 arms and a rounded centrodorsal with XXX and more exceedingly long 

 cirri with 60-70 segments which toward the end of the cirri develop a tubercle. 

 From the five arm stems of three radials (i. e., the radial and the IBr 2 series) are 

 developed usually 3 arms so that an arm stem is at first divided into a thicker and a 

 thinner part; the thicker part on the second segment or brachial axillary (IIBrj) 

 divides again into 2 arms. Usually 3 brachials between the syzygial pairs of the 

 arms. The brachials are at first rounded, but soon become compressed and very 

 strongly keeled, their ridges developed toward the aboral edge into an aborally 

 directed spine. The first outer pinnule is small, those following arc large and diminish 

 at first gradually. Color dingy reddish. Size up to 6 inches (which would mean an 

 arm length of about 75 mm.). King Georges Haven. 



Dujardin and llup6 in 1SG2 published a translation of Miiller's description. 



In 1877 Dr. P. H. Carpenter wrote that of the two specimens of Comatvla (Aniedon) 

 macrocnema in the Paris Museimi one has a hemispherical centrodorsal basin just 

 like that of Comatula (Antedon) eschrichtii {=Heliometra glacialis), while in the other 

 it is a short pentagonal or nearly circular column on which the cirri are disposed in 

 four alternating rows precisely as in Solanocrinus. 



In 1879 Dr. Carpenter listed Antedon macrocnema, referring the species to the 

 genus Antedon in contrast to Actinometra. 



Prof. F. Jeffrey Bell in 1882 proposed a specific formula for Antedon macronema 

 which was amended by Carpenter early in the year following. 



Carpenter's accoimt of Antedon macronema m the Challenger report in 1888 is 

 based wholly upon Ptilometra australis, as he had no specimens of P. macronemn. 

 The only specimens of P. macronema known at that time were those described by 

 Muller; Carpenter's locality record King George's Sound refers to these. 



In 1889 Prof. Theophile Studer gave brief notes on the habits and color of a 

 comatulid dredged by the German steamer Gazelle in Turtle Bay, Dirk Hartog Island. 

 The specimen referred to was subsequently described under the name Ptilom-etra 

 dorcadis. 



In 1890 Carpenter recorded, as Antedon macronema, several specimens from Port 

 Phillip, Victoria. This is the second record for the species — or the third if we include 

 Professor Studer's unidentified comatulid. 



In 1891 Dr. Clemens Hartlaub wrote, following Carpenter, that Antedon macro- 

 nema from the east coast of Australia is an exception to the rule that species of the 

 Spinifera group occur in deep water. The species occurring on the east coast of 

 Australia is P. australis, and the specimen listed from Sydney belongs to this form. 



In 1907 I described the new genus Ptilometra with the type species Alecto m-acro- 

 nemaJ. Muller, 1841, an error for Comatula macronema J . Mtillor, 1846, and listed the 

 species as Ptilometra macronema. In 1909 I doscri})ed Ptilometra dorcadis, which was 

 based on the specimen mentioned by Professor Studer in 1889, and listed the species 

 in a report upon the comatilids collected by the Gazelle. In my report upon the 

 crinoids of the Hamburg Southwest-Australian Expedition, 1905, published in 1911. 

 I recorded and gave notes on sLx specimens presumably from the vicinity of Perth. 

 The specimens recorded as Ptilometra macronema from Koombana Bay are in reality 

 Aporometra occidentalis. In 1910 I examined the types of Miiller's Comatula macro- 



