118 AddvPfis. [Feb. 



description, by Dr. Kai-l Fiedler, of Heterotrema sarasinorum, a new 

 sj-nascidian genus of the family Disfomidce, found among the sponges 

 obtained by Drs. P. and F. Sarasin at Trincomali, Ceylon, and in' the 

 Annals of the Genoa Museum, Dr. L. Camerano has described a new 

 species of Gordius found at Bhamo, on the upper Irrawaddy, by Sig. Fea. 



Echinodermata. — In the P. Z. S., Profe.ssor JeSvej Bell notes the 

 names of some species of Echinoderms not yet known from the Bay of 

 Bengal, collected by Mr. Thurston, and in a collection by Mr. E. W". 

 Gates from the Gulf of Martaban. 



Herr. J. Brock's collections of Ophiurids from the Indian Archi- 

 pelago have been described by Prof. H. Ludvvig, in the Zeitschrift fur 

 Wissenscliaftliclie Zoologie, and an account is given of a very remarkable 

 new, probably natatory, form of ophiurid, or brittle-star, found near 

 Amboyna. The most striking peculiarity of it is that each joint of the 

 arm bears a pair of large fins, which can hardly have any other purpose 

 than to confer upon the animal the power of swimming, a mode of 

 locomotion hitherto unknown in the class or even in the phylum to which 

 the animal belongs. In allusion to its probable mode of locomotion it 

 has been appropriately named Ophioptero7i elegans. 



In the Zoologisclie Jahrhilcher, Dr. Ludwig also reports on 41 

 species of Holothurians from the same collection, of which 5 are new. 

 Dr. L. Doderlein gives an account of the Asteroidea, Ojpliiuroidea, and 

 Echinoidea collected in Ceylon by Drs. P. and F. Sarasin. 



The report on the Echinoidea collected by Dr. J. Anderson in the 

 Mergui Archipelago, already referred to, contains an account of six 

 species whose association in such a limited area is remarkable ; and the 

 fact tliat the regular echinids all belong to the family Temnopleuridce is 

 especially striking and noteworthy, because in a collection from the 

 Andaman Islands, described by Prof. J. Bell, this family is quite unre- 

 presented. The collection presents other intei'esting peculiarities and 

 the occurrence in the Indian Ocean proper of the Australian form 

 Arachnoides placenta has only once before been recorded. 



The Asteroidea of the same collection have been described by Mr. 

 W. P. Sladen, who finds that they also are particularly interesting — not 

 only from containing new and rare forms, but because some of the 

 specimens show characteristic variations which indicate the action of 

 special local conditions, which with more plastic types might probably 

 result in new morphological developments. Mr. Sladen also notes the 

 rarity of Andamanese forms in the collection. 



Dr. P. H. Carpenter's report on the Mergui Comatulo} (Feather 

 Stars) contains an account of five species of Antedon, one of which is 

 new, and of a new and remarkable type of Actinometra, which was found 



