70 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxiii. 



KEY TO THE SPECIES DESCRIBED. 

 Genus DEC AM ETROCRINUS Minekert. 



A. ('entro-dorsal lary;e and conical, bearing about 80 cirri. 



( 1 ) Decametrocrinus horealis, new species. 

 Genus ANTEDON de Fr^minville. 



A. A syzygy in the radial axillary. 



a. 10 arms: the first jtinnnle much elongated, with a distal comb-liice process as 



in Cotnatula " (2) Antedon ram, new species. 



aa. 20 arms: distichals 4 (3 + 4)'': cirri smooth, with 15 joints. 



(3) A. liartlauhi, new sjiecies. 

 A A. Three articulated radials. 



a. The lower jiinnules long and flagellate, the first with very short, the second 

 and following with much elongated joints: cirri smooth, with greatly 

 elongated joints and a long terminal claw: brachials mostly oblong. 



(4) A. (eneUoiiJc-'i, new species. 

 aa. The lower 2)innules long and flagellate, with numerous short and broad joints. 



[EscHRiCHTii group.] 



(''. Cirri always more or less spiny: distal joints of first pinnule short and Inroad 



like the basal. 



c. Fifth pinnule longer than the first: first and sixth pinnules usually about 



equal, but the sixth may be the longer: arm joints strongly overlapping, 



short-triangular: intersyzygial interval two joints. 



d. Third syzygy in the twelfth brachial (5) A. asperrimn, new species. 



dd. Tliird syzygy in the fourteenth brachial (6) ^4. perplexa, new species. 



cc. Fifth pinnule much shorter than the first. 



d. Third pinnule the longest, with elongated joints, differing from the first 

 and second, which have short and broad joints: fourth pinnule nmch 



shorter: 40 cirrus joints (7) A. laodice, new species. 



dd. Third pinnule equal to, or not much shorter than, the second. 



e. Joints of the third pinnule mostly wider than long as in the first and 

 second: arm joints short and triangular: more than 40 cirrus joints: 

 arms smooth: third pinnule most like the second. 



(8) A.cschricldii (J. MuUer). 

 ddd. Third pinnule has fewer but much longer joints than the first and 

 second. 

 e. Less than 40 cirrus joints: arm joints triangular. 

 /. Arm joints short, much wider than long, strongly overlapping: 35 to 



40 cirrus joints (9) A. inexpectata, new species. 



ee. Over 40 cirrus joints: arm joints triangular, strongly overlapping: 

 lower brachials strongly tubercular. . . (10) A. ralltbnni, new species. 

 dddd. Third pinnule composed of a few elongated joints, and much shorter 

 than the second, which has short joints. 



«It is unfortunate that the name Acfinometra of Johannes Miiller is untenable. 

 Miiller jjroposed the name in 1841 (Wiegmann's Archiv fiir Naturgesch., 1841, Bd. 

 I, p. 140), naming as the type Actinomelra imperialis, which was described by him at 

 the same time. Later, after visiting the Paris Museum, Miiller found that his Acti- 

 nomelra imperialis was identical with the Comaiula wlaris of Lamarck, which is the 

 type of the genus Comutida proposed by Lamarck in 1816 (Hist. Nat. des Animaux 

 sans vertebres, II, p. 530. ). Thus Comatula 1816 and Actinometra 1841, being founded 

 on the same species, are synonyms, and it becomes necessary to replace the latter 

 by the older name established by Lamarck. 



^4 (3+4): four joints, the third and fourth united by syzygy. 



