X PREFACE. 



the endopod of the second pleopod in the male carried a stylet. The 

 females had the transverse foramen, which constituted the proximal 

 part of the abdominal notch, just as did the males. With this modifica- 

 tion of Hansen's genus Dynamenella, of which he makes Dyminiene 

 perfomta the type, I can then refer to it the following species: Dyn<i- 

 inene benedicti, Dynamene glabra, and Dynamen*. moorei. The follow- 

 ing shows these relations more exactly: Dynamene perforata =Dyna- 

 iiu ,i,lln j rforata; Dynamene benedicti = Dynamenella benedict! ; 

 Dynamene glabra = Dynamenella glabraj Dynannn' moorei Dyna- 

 mendla moorei. Inasmuch as only females are known of Dyimntrn, 

 angulata and Dynamene dilatata, it can not be stated positively 

 whether they should be referred to Dynamenella or Paracerceis. 

 Doctor Hansen says that, judging from the aberrant shape of the 

 antennulse, D. dilatata must probably be established as the type of a 

 new genus.. 



In regard to Cilicsea linguicauda and Cilicasa granulosa, Doctor 

 Hansen says that the former is probably, the latter perhaps, a specie- 

 of Cymodoce. Upon an examination of the pleopods subsequent to 

 the printing of my paper and the publication of Doctor Hansen'- I 

 find that these two species not only should not be referred to the 

 genus Cymodoce, but not even to the section Cymodocini or to the 

 group Spha?rominffi hemi branchiate. Both branches of the fourth 

 pair of pleopods are similar, fleshy, with transverse folds, without 

 plumose setse, and the outer branch is not two-jointed. These two 

 species, therefore, belong to the group Spharominfe eubranchiatae. 

 In these species the exopod of the third pleopod has an articulation, 

 and is therefore two-jointed. The character of the abdominal notch 

 without paired denticles would seem to exclude them from the genus 

 Paracerceis as restricted by Hansen. The character of the uropods, 

 which are strongly altered, would exclude them from the genus Cer- 

 ceis Milne Edwards. They can not be placed with //</*>/ v///V/ Miers, 

 because they lack the large, mesial process on the sixth thoracic seg- 

 ment. It will be necessary to establish a new genus for these two 

 species, for which I propose the name Discerceis, C. granulosa being 

 the type. 



Doctor Hansen does not mention Cilica&a carinata in his discussion 

 of the species of this family. Upon examination, I find that the 

 branches of the fourth pleopoda are similar, flesh.} 7 , crossed with trans- 

 verse folds, the outer branch being unjointed. The outer branch of 

 the third pleopod is also unjointed. Although the only specimen is a 

 male, judging from the character of the uropods 'and their similarity 

 to the males of other genera in this family, there is no stylet attached 



