fiOO PUfX'EEDINGS OF THE NATIONAL MUSEUM. vol. xxvm. 



o-cncnil (Iclails. hut ditl'cr in several particulars, as also do the speci- 

 mens here deserilu'd. The greatest ditierences are found in the furea, 

 the tirst and foui'th swinimino- legs, the abdomen, and the egg strings. 

 In Dana's original species the branches of the furca are longer and 

 more strongly curved, while in the present specimens the base of the 

 furca is larger and the branches are short, straight, and strongl}' 

 divergent. 



All the authors unite in characterizing the species })v a complete 

 absence of the st't;e on the posterior ])order of the Hrst swimming legs. 

 In the present specimens the}' are certainly present, but are unusually 

 small. 



Dana's species shows the fo.urth legs three-jointed, with live spines, 

 all about the same length; in the present specimens there are l)ut foui- 

 spines, and the inner terminal one is twice the size of the others. All 

 the authors write that the abdomen is obscurely two-jointed, but Kroyer 

 figures the adult female with an apparently one-jointed abdomen, as in 

 the figures herewith presented. Dana states that the egg strings are 

 '"longer than the body" (p. 1354); Steenstrupand Liitken ligure them 

 as only half the length of the Ijody, but as twice the length of the 

 abdomen, with eggs so large that each tube could contain only twenty. 



In the present specimens the egg tubes are but a trifle longer than 

 the alulomen (one-third the entire length), but each contains 40 eggs. 



In view of such ditierences it might seem as if the present specimens 

 constituted a new species, but after careful consideration this does not 

 seem to be warranted. In the first place, they come from the same 

 host as those ol)tained l)y the authors mentioned, a good presumption 

 in favor of their identity. 



Again. l)oth Kroyer and Steenstrup and Liitken found great differ- 

 ences in their specimens, and they each figure what they call a variety 

 of the species fully as different from the type as the present speci- 

 mens. Nor do the egg tulies here shown differ any more from those 

 given by the authorities just quoted than the latter do among them- 

 selves. For this reason these specimens have l)een referred to Dana's 

 species, and possibly the males reported hy Brian (1898) may belong- 

 here also. 



The foregoing are all the species of Cdligux from North American 

 localities which are contained in the collection of the National ^Museum. 

 But in addition the following species have been reported from the 

 West Indies by various authors. The types of these species have 

 been lost or are contained in foreign museums. In most instances 

 the species are represented by very few specimens, sometimes only 

 one or two, olitained many years ago. and none have since been found, 

 l)ut this is chiefly, if not wholly, due to the fact that no investigations 

 hive been made in that region since these specimens were found; 

 and there is every reason to belie\-e that a careful search at the pres- 



