STATE GEOLOGIST. 163 



found with the type. I see no reason, especially in view of the 

 latter fact, to regard it as even a well marked variety. 



C. crassicornis is widely distributed in America as well as Europe, 

 but is never very common. The color is always reddish. 



Antennae 6-jointed. 

 Sp 30. Cyclops sequoreus, Fischer. 



A brackish-water species, .85 mm. long, which in a number of 

 characters departs from the type of the genus. Those who have 

 the opportunity to search the brackish pools alongour coast would 

 do science a service by looking for this interesting species. 



Note.— Cyclops navicularis, Say, is perhaps C. vindls of this report. C. setosus, Hal- 

 deman, (Phila. Acad, Sci., Vol. VIII, p. 331) is referred in my notes to C. serrulatus, I do 

 not now know with how much reason. « 



The reader is referred also to Cyclops latisslmus, Poggenpol, as quoted by Cragin- 

 which, although belonging to the section having sevjateen-jointed antennae, and hav- 

 ing feet like C. tenuicornis, is said to have a disc -like body, long-jointed antennules 

 with no armature, and the basal ioint of the abdomen very long. 



Cyclops ornatus is quoted by Cragin, but we are left in doubt as to the number of seg- 

 ments in the antennae, a point quite essential to tk e definition of species. 



(See under C. phaleratus.) 



Cyclopfi longicaudatus and C. igneui* are thought to be simply prematurely gravid 

 young of known species. 



(See Cragin, 1. c, (pp. 12—13.) 



Cyclops ftscheri of the same author agrees with C. Je ^uoreus in having six-jointed an, 

 tennse, but in nothing else apparently. It is, if correctly described, a very remark- 

 able form, with no setae on the antennae. 



FAMILY HARPACTICIDiE. 



Numerically the largest of the families of the Copepoda, this 

 group contains predominatingly marine and mostly minute animals, 

 frequently of strange and grotesque form. A few of the marine 

 forms, inhabiting the gulf of Mexico, are figured in the report of 

 the Minnesota Academy of Sciences for 1881. Of the over thirty 

 genera of the family less than a half dozen are not exclusively 

 marine, and of these most are brackish-water residents. The genus 

 Bradya contains blind copepods living in slime. 



The name was proposed by Dana, but was dropped in the final 

 report. Again revived by Claus, it is now in use by the best 

 authors. The general form and structure closely resembles that of 

 the Cyclopidse. The following characters are the more important 

 ones in distinguishing the family from the other families of the 

 order: 



