184 



ANTEDON ELONGATA. 



five or six short aud oblong , after which the joints become 

 sharply wed Reshaped and somewhat longer, though still 

 relatively short. After about the 50th joint they become 

 blunter and more oblong, and finally somewhat squarer 

 towards the arm-ends. 



The first syzygium is on the third brachial , and the 

 next usually between 15 and 21; then an interval of 9 — 16 

 joints between successive syzygia. 



The largest pinnules are those borne on the fourth and 

 five following brachials. Those on the sixth and seventh 

 brachials are the longest on the arm and consist of 25 — 30 

 stout cylindrical joints. The first pair, on the second and 

 third brachials, are considerably shorter and smaller than 

 their three successors on each side; the pinnule on the 

 tenth brachial is small on the inner arms of the ray, but 

 more equal to its predecessor on the outer arms. The next 

 few joints bear the smallest pinnules on the arm , after 

 which the length gradually increases towards the arm-ends , 

 but the pinnules never become specially long. 



Disc , naked and much incised ; 25 mm. in diameter. 



Total spread about 25 centim. 



Colour brownish white with greyer perisome. Sacculi 

 not very abundant along the pinnule ambulacra. 



Localiti/. Uncertain. Coll. Brugnians. 



Remarks. The general fades of this fine species leaves 

 little room for doubting its Oriental origin ; but 1 have never 

 come across a second specimen of it. The specific name 

 as in the case of Müller's other types in the Leyden Mu- 

 seum (except Actinometra Solaris) , seems to have been a 

 Museum name which was adopted by him. 



Two Mi/zostoma-cysts occur on the arms of this speci- 

 men , which seem to have escaped Müller's attention. 



6. Anfedott. elongttta, Mus. Leyd. sp. 



1841. Aleeto elongata, Muller. Monatsbericht d. Berlin. Akad. 

 p. 187. — Id., Wiegman's Archiv. 1841,1, p. 146. 



Notes iroin tUe Leyden Museum, Vol. 111. 



