6 Clarh — A Revision of Thalassometridap. and Himerometridas. 



and spiny overlapping distal edges, which become very marked after the 

 second syzygy. 



Pa a1)sent; Pi not especially long, and not stifl'ened, evenly tapering, 

 and rather slender distally, the component joints squarish or rather longer 

 than broad; folldwing lower pinnules rather long, sub-equal, slightly 

 enlarged, and very stiff, tlie elongated component joints witli overlapping 

 and spinous distal en<ls; middle and distal pinnules not very diflerent in 

 length from the proximal, but more slender; they are stiffened and flat- 

 tened laterally, with moderately long joints which have projecting and 

 spinous distal ends. 



Color (in spirits). — Flesh color to deep purple, the costals and lower 

 brachials usuaHy with a darker lateral line, the arms after the second 

 syzygy with numerous and thickly set, rather narrow, bands of darker. 



Distribution. — Port Denison (near Bowen), Ciueensland, to Andxuna, 

 New Guinea (Joliie), Singapore and the Philippine Islands. 



Depth. — Littoral, l)ut occurring down to 20 fathoms. 



The species included in this genus are: 



CoIobo7iie(ra perspinosa (P. H. Carpenter) 

 " suavis (A. H. Clark). 



?K Cyllometra A. H. Clark. 



The species remaining in this genus as restricted are: 



Cyllometra albopurpurea A. H. Clark 

 " anornala A. H. Clark 



" clanc (Hartlaub) 



" iwpinnata (P. H. Carpenter) 



" informis (P. H. Carpenter) 



" manca (P. H. Carpenter) 



tigrina (A. H. Clark). 



4. Amphimetra gen. nov. 

 Genotype. — Comatula (Alecto) milherdJ. Miiller, 184(). 



Centro-dorsal hemispherical or more or less discoidal, the moderately 

 large polar area fiat, slightly convex, or slightly concave; cirrus sockets 

 arranged in one to three crowded, more or less alternating, marginal rows. 



Disk often more or less plated. 



Cirri xiii-xxx, 25-50, short, varying from slender and tapering to very 

 stout. The component joints may be sub-equal, all very short, or all 

 longer than broad, or the proximal joints maybe longer than l)road, the 

 distal short; dorsal spines are usually (though not always) developed, at 

 least distally ; but, though prominent, they are never very large. 



Arms 10 to 20; but the division series, when developed, are very irregu- 

 lar in occurrence; iiBr 4 (:i4-4) ; iiiBr2, developed interiorly in 1, 2, 2, 1 

 order; iBrand lower brachials (including division series) in lateral appo- 

 sition, and more or less "wall-sided"; i Br, division series, and i)roxi- 

 mal brachials rather strongly convex longitudinally as well as trans- 

 versely, giving them a characteristic swollen appearance, like the corre- 



