PYCNOGONIDA. 



BY W. T. CALMAN, D.Sc. 



{Assistant in the Department of Zoology, British Museum {Natural History) ). 



I . — Introduction ••-.... 



n. — List of Stations at which Pycnogonida were obtained 

 III. — List of Species ...... 



IV. — Notes on Occurrence and Distribution 

 V. — Variation and Specific Characters 

 VI. — The Significance of the Decapodous Pycnogons 

 VII. — Nomenclature and Terminology . 

 VIII. — Systematic Notes and Descriptions of New Species 

 IX. — List of Papers referred to . 



Index ........ 



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2 

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69 

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I.-INTRODUCTION. 



The collection of Pycuogouida obtained by the " Terra Nova " Expedition far exceeds 

 in extent that of any Antarctic expedition yet reported on. It comprises no fewer 

 than forty-four species,* all from the Ross Sea area, with the exception of one species 

 [Colossendeis megalonyx, Hoek) represented by a solitary specimen dredged near 

 the Falkland Islands. Eleven species are described as new, while five others are 

 identified with species only very recently described in Mr. Hodgson's (1914-15 )f 

 prehminary report on the Pycnogonida of the German South Polar Expedition. 

 While none of the new species can be compared, in point of morphological or 

 systematic interest, with the discoveries of earlier expeditions, they serve to accentuate 



* It may be of interest to give the numbers for some other Antarctic expeditions. Excluding name? 

 subsequently withdrawn by their authors, or definitely placed as synonyms in the present report, the 

 " Discovery " obtained twenty-six species, the "Fran9ais" seven, the "Scotia" fifteen, the " Pourquoi 

 Pas? " twenty -four, and the " Gauss " twenty-nine. 



I The numbers enclosed within brackets refer to the list of papers at the end of the Report. 



