59.39(72.2) 



Article VI.— ECHINODERMS FROM LOWER CALIFORNIA, 

 WITH DESCRIPTIONS OF NEW SPECIES: SUPPLEMEN- 

 TARY REPORT 1 



By Hubert Lyman Clark 



Museum of Comparative Zoology, Cambridge, Massachusetts 



When the collection of echinoderms made by the 'Albatross' 

 Expedition to Lower California in the spring of 1911 was sent to me about 

 ten years ago, by some mistake a considerable amount of material was 

 not shipped. This was discovered and sent to me in the late fall of 1921 

 and, as it contains species not in the original lot, it seems desirable to 

 publish this supplementary report. 2 



This second collection contains 462 specimens of 58 species, and no 

 fewer than ten of these species were not represented in the first collection. 

 Moreover, two of the ten additional species are new to science, though 

 unfortunately each is represented by only a single broken specimen. 

 The entire collection of echinoderms made by the 'Albatross' on her 

 Lower California cruise, therefore, consisted of 2343 specimens of 117 

 species, of which nine were undescribed. There were 41 kinds of sea- 

 stars, 34 of brittle-stars, 21 of echini and 20 holothurians, and a single 

 specimen, in the supplementary collection, represents the comatulids or 

 feather-stars. The presence of this comatulid, which is of an undescribed 

 species, is perhaps the most interesting feature of the additional material. 



More than a third of this second collection is from shore stations, of 

 which San Francisquito Bay is easily the most important, 98 specimens 

 of 10 species coming from there, two of these not being in the first collec- 

 tion. It is interesting to note that the remarkable new brittle-star, 

 described beyond, was taken at Station 5694, which was noted in my 

 first report as being the station where the most species were taken. Here, 

 at a depth of 640 fms., no fewer than 19 species were collected. The new 

 comatulid is from Station 5692, which is off Point San Tomas, west 

 coast of Lower California, a region noted in my earlier report for the large 

 number of species found there. 



I desire to express here my thanks to Mr. Roy W. Miner, of The 

 American Museum of Natural History, for courtesies in connection 

 with the preparation of the present report. 



'Scientific Results of the Expedition to the Gulf of California in charge of Dr. C. H. Townsend, by 

 the D. S. Fisheries Steamship 'Albatross' in 1911; Commander G. H. Burrage, U. S. N., Commanding. 

 XII. Published by permission of the U. S. Commissioner of Fisheries. 



2 The present report is supplementary to 'Echinoderms from Lower California, with descriptions 

 of new species.' By Hubert Lyman Clark, 1913, Bull. Amer. Mus. Nat. Hist., XXXII, pp. 185- 

 236, Pis. xliv-xlvi. 



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