240 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Remarks. The characteristic feature of this form is the very slight development 

 of the processes on the distal ends of the segments of the lower pinnules. This charac- 

 ter, however, is very variable, and the specimens mentioned above may be matched 

 fairly well with some from Singapore in the collection of the Copenhagen Museum, 

 and with some from India in the collection of the Indian Museum. The cirri are 

 proportionately slightly longer than is usual in serripinna, but in this feature also 

 it may be matched by specimens from India and Singapore. 



The specimen from Bagamoyo, which I have previously referred to this form, 

 seems on reexamination to be more properly referable to typical serripinna (see pages 

 217 and 229). 



Localities. Fouquet Island, near Mauritius; Prof. Karl Mobius [A. H. Clark, 

 1911, 1912, 1918; Hartmeyer, 1916] (1, Berl. M., 5101). 



Cargados Carajos, northeast of Mauritius; 55 meters; Sea Lark; Prof. J. Stanley 

 Gardiner [A. H. Clark, 1911, 1913, 1918] (9, B. M.). 



Mabahiss station 45; South Arabian coast (lat. 1803'30" N., long 5702'30" E.); 

 38 meters; lithothamnion; October 29, 1933 [A. H. Clark, 1936] (2, B. M.). 



Mabahiss station 27, Gulf of Aden (lat. 1157'12" N., long. 5035'00" E. to 

 lat. 1156'42" N., long 5039'12" E.); 37 meters, sand and shells, October 12, 1933 

 [A.H.Clark, 1936] (2, B.M.). 



Mabahiss station 10; Red Sea (lat. 1331'00" N., long 4231'00" E.); 55 meters; 

 September 17, 1933 [A. H. Clark, 1936] (fragments, B. M.). 



Geographical range. From Mauritius and Cargados Carajos to the Red Sea. 



Bathymetrical range. From the shore line down to 55 meters. 



History. This form was first mentioned under the name Oligometra serripinna 

 var. occidentalis in a paper by me on the crinoids of the coasts of Africa published in 

 1911. Notes were given on a specimen from Mauritius and on nine specimens from 

 Cargados Carajos, and the specimen from Mauritius was compared with specimens 

 of 0. serripinna from Singapore. In a paper on the crinoids of the Berlin Museum 

 published in 1912 I recorded a specimen under the name Oligometra serripinna occi- 

 dentalis that had been collected by Prof. Karl Mobius at Fouquet Island, near Mau- 

 ritius, and another from Bagamoyo. The specimen from Fouquet Island was the 

 one mentioned as from Mauritius in 1911. In a paper on the crinoids of the British 

 Museum published in 1913, I gave notes on nine specimens that had been collected 

 by the Sea Lark expedition under Prof. J. Stanley Gardiner at Cargados Carajos in 

 30 fathoms, the form being here called Oligometra occidentalis. These were the speci- 

 mens mentioned as from Cargados Carajos in 1911. 



In 1916 Dr. Robert Hartmeyer under the name Oligometra serripinna occidentalis 

 gave the catalog number of the specimen in the Berlin Museum from Fouquet Island 

 and said that the specimen from Bagamoyo was in the United States National 

 Museum. 



In my report on the crinoids of the Siboga expedition published in 1918, 1 included 

 occidentalis in the key to the species of Oligometra, giving as the habitat southeastern 

 Africa and Cargados Carajos. 



