6a 



\ 11 , ; v; K i | K . ( rin the Indian Ocean, 1912, p, [30 (Heterometra bengaJensis \ the 



tralian 1 



Washington, vol. 25, I9 I2 < 1' -'t [Zygometra punct 



Vbhandl. der Senck. naturforsch. Ges., vol. JS, 1913, Hefl 1, p. 83 



\. 1 Fauna Siidwest-Australiens, vol. .|. 1913, Lief. 6, pp. 313, 3'4 [Zygometra 



ian Mi ellaneous Collections, vol. 61, 1913, \" k, p. 21 Zygometra punctc 

 H. 1 . ( irnegie Institution of Washington Publication N"2u, 1 ■_*! 5, p. io$ (Heterometra 



j, \1ul1 • Pulujedan, east coast of the Aru Islands (Pearl Banks). 1 3 Metres. 4 Ex. 



Tli, men may be described ;is follows: 



trodorsal is discoidal, thin, with a broad flat circular dorsal pole 2.7 mm. ia diameter. 



cirri are XV, iS — 19 (usually r8), 9 mm. long; the first segment is very short, 



the second and third about three times as broad as long, the fourth about twice as broad as 



the fifth or sixth about as long as broad; the next two or three are similar, the following 



..i\ gradually in length so that the distal ten or eleven are slightly broader than 



long; the sixth and following bear prominent sharp dorsal spines. 



The radials are entirely concealed by the centrodorsal ; the IBr, are very short and 



bandlike, six times or more as broad as long, united to the IBr, laxillaries) by pseudosyzx gy : 



low triangular, with the lateral angles slightly truncated, three times as broad as long. 



IIT.r series 4 (3+4), broad like the IBr series, with straight lateral edges which are more or 



-wall-sided" and almost or cpiite in apposition; the lateral outer portions of the ossicles ot 



the division series are roughened or very finely papillose, as in the species of Marütntetra. 



The twenty-one arms are 35 mm. long. comparatively short and rather stout; the first 

 brachial is slightly wedge-shaped, three times as broad as the median length, entirely united 

 internally; the second is much more obliquely wedge-shaped, twice as broad as the external 

 length; the first syzygial pair (brachials 3 -f 4) is slightly longer internally than externally, twice 

 as broad as long internally; the following three brachials are oblong, three to four times as 

 broad as long; the succeeding are wedge-shaped, twice as broad as long, becoming as long as 

 broad terminally; the brachials have rather strongly produced distal edges. 



The disk is entirely covered with a pavement of comparatively heavy calcareous plates 

 which may, especially the larger ones on the anal tube, bear short spines or tubercles. 



P D resembles P„ and is composed of 20 segments; P, is about 5 mm. long, rather stout 



illy but in the distal half tapering to a slender tip, composed of 20 segments of which the 



first is about three times as broad as long and the following gradually increase in length 



- long as broad on the ninth and slightly longer than broad terminally; the longer 



jments are rather strongly carinate, the carination having a straight profile which 



to the long axis of the segments; the short outer segments have slightly prominent 



1' is similar. but very slightly smaller and shorter; I' is 2.5 mm. long. composed 



of 1 and, except for its small si/.-, is similar to the preceding; I', is 2 mm. long 



with 12 of whi.h the first thre<- ;ire much broader than long, the fourth about as 



I the distal twice as long as broad; I'. is 2.5 mm. long with 12 segments, 



