193 



The first brachial has the proximal and distal edges parallel, the outer edg-e slightly 

 produced and faintly scalloped, the inner edges in apposition, in their distal half everted and 

 scalloped; a similar length of the inner portion of the distal edge is similarly everted and 

 scalloped, and the inner distal angle is rounded and produced into a thin rounded process with 

 more or less scalloped border-, the proximal border, and the distal border other than the 

 portion described, is unmodined. 



The second brachial is about the length of the first, slightly wedge-shaped ; the distal 

 edge is everted and stands out at right angles to the axis of the arm in the form of an 

 enormous thin rounded or fan-shaped crest with a rounded or broadly scalloped edge, sometimes 

 divided in the middle, which may reach 1.5 mm. in height, or from three to four times the 

 greater (outer) length of the ossicle; the proximal outer corner of the segment is slightly 

 produced backwards over the distal outer corner of the first brachial, and is scalloped or 

 slightly tuberculated ; the produced inner distal angles of the first brachials reach as far as 

 the base of the crest. 



The third brachial (the hypozygal of the first syzygial pair) is oblong, very short, five 

 or six times as broad as long, unmodified. 



The fourth brachial (the epizygal of the first syzygial pair) is very short, oblong, little 

 if any longer than the third (the hypozygal) ; the distal 

 border is everted and produced into an enormous crest 

 similar to, and nearly or quite as large as, that on the 

 second brachial. 



The fifth brachial is slightly wedge-shaped, with a 

 crest about half as high as that on the preceding brachial 

 and more irregular. 



Fig. 11. 



The sixth has a strongly produced and thickened . , . , - . , 



° J l Lateral view o! the proximal portion of a 



distal edge which is COarsely Scalloped. specimen of Strotomelra ornatissimus from Stat. 



ir I22- X 4- (Courtesv of the U. S. National Museum). 



The seventh is slightly wedge-shaped, from two 

 to two and one half times as broad as long, with the distal edge slightly produced in the 

 direction of the axis of the arm and finely spinous. 



After the tenth or twelfth the brachials become triangular, about as long as broad, and 

 after four or five more very obliquely wedge-shaped and longer than broad, and distally longer 

 and less obliquely wedge-shaped. Beyond the sixth the brachials are almost smooth, with only 

 slightly produced and finely spinous distal edges. 



P x is about 4.5 mm. long with about thirteen segments of which the first two are 

 broader than long with rounded dorsal processes, the third is slightly longer, the fourth is 

 about as long as broad, and those beyond the seventh are slightly longer than broad. P. : is 

 about 4 mm. long, similar to Pj , composed of twelve segments of which the outer are slightly 

 longer than those of P r The genital pinnules are about 4 mm. long, with the fourth, fifth and 

 sixth segments enormously expanded, roofing over the gonads which are also protected ven- 

 trallv by strong calcareous plates of irregular shape; the seventh and following segments are 

 small and slender. 



' S1BOGA-EXPEDITIE XLIli. 25 



