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HALIPORUS DORIS. 



191 



ff. 



ft-. 



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 V 



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these organs are represented on the posterior pair of legs of the female 



IT. 



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pods attached to all the legs, as well as to the third maxillipcds. 

 H/jmenopeneus Smith,* appears to be equivalent to Ilaliporm Bate. 



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Haliporus doris Fax. 

 Plate XLIX., Fig. 1-1'. 



Bull. Mus. Conip. Zool, XXIV. 214, 1893. 



This is a larger and more robust species than IL nereus, with the ros- 

 trum more upturned. In all other respects, excepting the structure of the 

 sexual organs on the sterniun of the female (the male has not been seen), 

 the two forms agree so closely that one description "would serve for both. 

 The character of the parts above referred to is so constant in the same 

 species among the Crustacea, that^ in the light of our present knowledge, 

 the form here treated of must be considered a distinct species. The tuber- 

 cular processes of the third pair of legs, together with the sternal tuber- 

 cles immediately behind them, arQ very like the same structures in H, ncrcus. 

 But here the likeness ends. Betwixt the fourth pair of legs there is a trans- 

 verse diaphragm consisting of a median tongue^ concave on its anterior lacCj 

 and witli its lower free edge entire, supported on each side by a strong, 

 blunt, triangular process, of equal height with the median tongue-like plate. 

 Between the bases of the legs of the fifth pair, in place of the low longitudmal 

 median ridge seen in H. mreiis, there is in this species a large, setiferous, tri- 

 gonal tooth or tubercle, acute at the tip, equalling in height the transverse 

 partition on the sternum of the antecedent segment. The posterior median 

 angle of this tooth abuts against the low transverse ridge that forms the 

 posterior limit of the last thoracic sternum. 



The differences between these structures in the two species //■ nereus and 

 //. doris will be easily understood by reference to the figures on Plate 

 XLVIIL and Plate XLIX, 



The third maxiUipeds and all the legs carry rudimentary cxopods, as in 



II. nereits. 



Length, 104 mm. ; rostrum, 10 mm.; whole carapace, 42 mm. 



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* Bull Mus. Comp. ZoOl, X. Dl, 1882. 



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