48 BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



The chief paper of the year was Carpenter's account of the comatulids of the 

 Mergui Archipelago, based upon a collection made by Mr. John Anderson. In this 

 paper the following comatulids are noticed: 



Antedon elegans Zygometra comata. 



Antedon andersoni, sp. nov Pontiometra andersom. 



Antedon milberti Amphimetra milberti. 



Antedon spicata Stephanometra spicata. 



Antedon conjungens Lamprometra protectus. 



Actinometra notata, sp. nov Comatella stelligcra. 



The difficulties attending the use of the various specific groups instituted by 

 Carpenter were first brought to notice by tin's article, for he referred Actinometra 

 notata to the "Paucicirra group" in which he described it as a new species near 

 Act. paucicirra; it really belongs in the " Stelligera group," and had Carpenter 

 placed it here he would have seen at once that it is the same as the Actinometra 

 stelligera described at great length in the Challenger report. It is ha this paper that 

 Carpenter gives to the Series I of Antedon the name of " Elegans group;" at first he 

 had considered the single species represented in the collection as new, and when he 

 sent some myzostomes which he found upon it to Professor von Graff he gave him 

 the name of Antedon comata for it. Later he decided that it was the same as the 

 Australian species described by Bell, and suppressed the name. It has been recently 

 shown, however, that his first decision was correct. 



Aside from some papers of purely local interest, the chief contribution in 1890 

 was the preliminary paper by Dr. Clemens Hartlaub describing a large number of 

 new forms from the Indian Ocean. The complete work on the littoral comatulid 

 fauna of the "Indian Archipelago " appeared in 1891; it is exhaustive in its treat- 

 ment, and, besides most excellent descriptions (accompanied by figures) of all the 

 new species, includes redescriptions of many imperfectly known forms, taken from 

 the types. During the preparation of this work Hartlaub was in constant com- 

 munication with Dr. P. H. Carpenter, to whom he referred several of the more 

 difficult problems; it thus comes to have an additional authoritativeness, as it 

 embodies to a certain extent conclusions reached by Carpenter from a study of 

 material upon which he never published. Hartlaub identified many of Liitken's 

 nomina nuda, placing them correctly in the synonymy. 



The species considered by Hartlaub are : 



Antedon bengalensis, sp. nov Heterometra bengalensis. 



Antedon martensi, sp. nov Himerometra martensi. 



Antedon kraepelini, sp. nov Himerometra robustipinna. 



Antedon brockii, sp. nov Amphimetra variipinna. 



Antedon affinis, sp. nov Heterometra affinis. 



Antedon nematodon, sp. nov Amphimetra nematodon. 



I Craspedometra amboinsc. 

 Antedon ludovici {,, , ... 



( Craspedometra acutmrra. 



Antedon crassipinna, sp. nov Himerometra robustipinna. 



Antedon clarse, sp. nov Petasometra clarse. 



Antedon bella, sp. nov Cenometra bella. 



Antedon bella, var. brunnea, var. nov Cenometra brunnea. 



Antedon klunzingeri, sp. nov Lamprometra palmata. 



