J 54 CEYLON PEARL OYSTER REPORT. 



brachials respectively, as in the specimens described by Hartlaub, but in the 

 type the 2nd syzygy is between the 11th and 15th brachials. Tn the specimens 

 under notice, the succeeding syzygies occur in every 5th to 7th joint. The 

 pinnule of the 2nd brachial (Plate, fig. 1) has 11 joints, the first 3 broad, the 

 remaining ones cylindrical, twice as long as broad, and having 2 very minute spines 

 projecting from their distal ends. The pinnule of the 4th brachial is stouter than, 

 and nearly twice as long as that of the 2nd, and has 13 joints of very similar 

 character; while that of the 6th brachial has 9 or 10 joints, and is a smaller pinnule 

 than that of the 2nd. The pinnules of the 3rd, 5th, and 7th brachials are smaller 

 than those of the 2nd, 4th, and 6th, but the joints are similar, as are those of the 

 next 10 or 12 pairs, though in the latter the basal ones differ in diameter less 

 markedly from their successors. 



Localities: Stations XXIII. , XXIV., and XXV., off Trincomalee : a number of 

 mure or less mutilated specimens. Many greyish mottled ones were found upon a 

 large colony of Gorgonia [Rhipidogorgia) flabellum from Station XXIII. 



Antedon milberti (Muller). 



A small specimen of this species was obtained at Station I., and 2 full-grown ones 

 at Station LVII. In one of the arms of one of these, unfortunately detached when 

 found, the 5th brachial beyond the 3rd syzygy is an axillary, and there is a syzygy 

 in each of the 3rd brachials beyond it. 



Antedon carinata (Lamarck). 



One specimen of this widely distributed species was dredged at Station L1V. , and 

 several mutilated ones' at Station LXVIII. 



Antedon marginata, Carpenter. 



One considerably mutilated specimen of this species was dredged at Station XXXIX. 

 It has 11 arms, and most of the 2nd pinnules agree well with those of the single 

 specimen dredged by the " Challenger " at Station 208, off Manilla, which Carpenter 

 says " Terminate so abruptly that they seem to have been broken off by some 

 accident and not completely repaired. The diameter of the joints suddenly decreases, 

 and there are from 1 to 4 quite small joints at the end of a large and stout one 

 which is considerably longer than wide." A small specimen from Welligam Bay 

 (Station XXXIV.) may possibly belong to this species. The number of arms cannot 

 be determined, but in one of the rays the outer face of the distichal axillary bears 

 two pahnars. 



Antedon indica, Smith. 



One specimen of this species, with 29 arms, was dredged at Station LIV. The 

 original visceral mass is almost completely displaced, but remains in organic continuity 

 with a new one in an early stage of formation. 



