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XL. 



EEPOETS ON THE ZOOLOGICAL COLLECTIONS MADE IN 

 TORRES STRAITS BY PROFESSOR A. C. HADDON, 



1888-1889. 



PYCNOGONIDA. By GEORGE H. CARPENTER, B. Sc„ Lond., 



Assistant Naturalist in tlie Science and Art Museum, Dublin. 

 (Plate XXII.) 



[communicated by PBOFESSOB HADDON.] 

 [Read May 18, 1892.] 



The collection of " sea-spiders" obtained by Professor Haddon 

 is very small, numbering only seven individuals referable to three 

 species. Of these, however, two appear to be new to science. 

 Almost all our knowledge of exotic Pycnogonids is derived from 

 the work of deep-sea dredging expeditions, and the present small 

 contribution shows how much might be learned from a study of 

 the shallow-water species in the tropics. 



Professor Haddon's specimens were dredged from a depth of 

 about fifteen fathoms, between the reefs off ]\iurray Island. 



In a recent Paper on the Pycnogonida of the Australian 

 Seas, Haswell (4) enumerates eighteen species, of which only 

 one {Phoxichilidium Hoekii, ]\iiers) is from Torres Straits. 



Of the species taken by Professor Haddon, two belong to the 

 Pallenidse and the other to the Eurycydidse. In the nomencla- 

 ture of the families I have followed Sars in his recent monograph 

 of the North Atlantic species (6). I have also adopted his terms 

 for the different parts of the body and its appendages. He calls 

 the three pairs of appendages in front of the ambulatory legs 

 " chelifori," " palpi," and " false legs," and has introduced the 

 names " cephalic segment " and *' caudal segment " for the fore- 

 most and hindmost divisions of the body respectively, instead of 

 " cephalothoracic segment " and " abdomen " hitherto in general 

 use. 



