388 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.43. 



portion again tapering slightly; the first segment is very short, the 

 following very gradually increasing in length to the eighth wjiich, 

 with the following, is about twice as broad as long; the penultimate 

 segment is about as long as broad; after the seventh or eighth seg- 

 ment the dorsal profile of the segments becomes very strongly, but 

 evenly, convex, so that in a lateral view the dorsal edge of the cirri 

 appears to be strongly scalloped; the opposing spine is small and 

 blunt, inconspicuous; the termintvl claw is small and blunt. 



The radials are concealed by the centrodorsal; the IBri are very 

 short, oblong, almost or quite united laterally, united to the IBr.^ 

 by cryptosynarthry, the two ossicles together forming a pentagonal 

 element about twice as broad as long; the IBrj are free laterally. 



The 10 arms are apparently GO or 65 mm. long; they are exces- 

 sively stout in the basal half, tlie brachials measuring between 3 and 

 4 mm. in transverse diameter; the dorsal surface of the arms is pecu- 

 liarly flattened; the first brachial is exceedingly short, forming what 

 appears superficially to be a syzygial pair with the second, this pair 

 being wedge-shaped, about twice as broad as the median length, 

 interiorly united; the third and fourth brachials (syzygial pair) are 

 wedge-shaped, about twice as broad as their inner (greater) length; 

 the following brachials are slightly wedge-shaped, about three times 

 as broad as the median lengtJi, gradually becoming triangular, two 

 and one-half or three times as broad as the longer side; the whole arm 

 presents an exceptionally rugged appearance. 



Pi is 13 mm. long, and is composed of 30 segments, of which the first 

 3 or 4 are broader than long, and the remainder are about as long as 

 broad; none of the segments are carinate; the terminal comb has 11 

 teeth, which are bluntly triangular, rather narrow basally, about as 

 high as the lateral diameter of the segment that bears them; Pj is 

 simOar but not so long, as stout basall}^ as Pj but, owing to the lesser 

 length, tapering slightly more rapidly; Pg is similar, 8.5 mm. long, 

 with 21 segments, almost all of which are broader than long, as stout 

 basally as P, but becoming more slender distally; tliis pinnule bears 

 no comb; the following pinnules are apparently similar to P3, grad- 

 ually becoming more slender distally with longer segments, the 

 change taking place first in the distal portion of the pinnules and 

 working toward the base, and slightly decreasing in length. The 

 segments in the proximal part of the pinnules foUoAving the tliird are 

 more or less produced in a thickened convexity dorsally, this dying 

 away in the outer half of the pinnule; this slowly disappears in the 

 distal half of the arm. 



The color in s])irits is yellow. 



2. Southwestern Australia. — Four specimens. (See Die Fauna 

 Siidwest-Australiens, vol. 3, Lief. 13, p. 447.) 



