PYCNOGONIDA. 



The trunk rather clumsy, smooth. 



The neck very short. 



The proboscis very short and thick, scarcely constricted in the middle. 



The oculiferous tubercle rather high, erect, almost conical, a little tapering to the top; the ocelli very 



small, round. 



The caudal segment somewhat thick, not very long, obliquely erect 

 The chelifori somewhat short, rather clumsy, the transverse partition of the scape scarcely visible; the 



fingers very short, scarcely gaping. 

 The palps especially short, unjoin ted, truncated. 

 The ovigerous legs short, without claws. 

 The ambulatory legs somewhat short and thick, the gland duct on the fourth tarsal joint of the male 



short. The claw rather short and clumsy, with rather clumsy auxiliary claws of a little more 



than half the length of the claw. 

 Total length 7,i mm . The proboscis 1,7""". The trunk 4,3' nm . The caudal segment 2 mm . 



One single male taken in the port of Rio de Janeiro, and brought home by Kroyer; it is 

 still found in the museum. 



Kroyer, I.e. pp. 104 and 124, established this species as a Phoxichilidium, and gave also draw- 

 ings of the animal, as well as some particulars; but Kr0yer was no skilful drawer, and in this in- 

 stance he was especially unfortunate; and as, moreover, Kroyer, contrary to his common accuracy, 

 has made some essential errors by failing to see, it will be understood, that uncertainty might easily 

 arise as to the interpreting of this species of his. It will therefore be of some interest to get a 

 new description of the species, and it is only to be regretted that the original specimen has been 

 treated so badly by being used for representation. That notwithstanding the errors and representation 

 of Kroyer the divinations hitherto seem to have been correct, will not be of any importance so as 

 to prevent a future author in putting up (and, as it would seem, in rightly doing so) the species of 

 Kroyer as a type of a new genus. 



Kroyer, as we have seen, referred the species to the Phoxichilidium of Milne-Edwards, of 

 which genus he, I.e. p. 121, gave a copious description in Latin, which description was to comprise 

 all the species of the genus known to him. In this description the chelifori are mentioned in the 



following manner : < Mandibulse maximae sunt (dimidiam animalis longitudinem fere sequaiites) , ex 



articulo compositse basali, chelaque breviore - accordingly only one joint in the scape. Of the 

 palps it is said: Maxillae prioris paris desunt - - accordingly the palps are wanting. From the 

 specific description may be pointed out that the ovigerous legs, 1. c. p. 124, are said to be tenjointed, 

 from which the inference may be drawn that the animal has been full-grown, and further it may be 

 noticed that the bristles on the ambulatory legs are not mentioned, from which fact we may securely 

 conclude that the specimen of Kroyer has had no specially conspicuous bristles, or, at all events, 

 that Kroyer has not observed this peculiarity which was otherwise well known to him, and which 

 he has often mentioned and described in the sea-Arthropoda examined by him. (I have in vain searched 

 for such feathery bristles, comp. Bohm I.e. p. 182, PI. I, fig. 4 f). Finally Kroyer has not men- 



