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 (3-jointed. 

 Sp .'{0. Cyclops ajquoreus, 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 along our coast would 

 do science a service by looking for this interesting species. 



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

 •deman, (TMiila. Acad. Scl.,Vol. VIII, p. 331) is referred iQ my notes toC. serrulatus, Ido 

 not now know with liow much reason. 



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

 whicli, althdusjh belonging to the section having sevsnteen-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 j'>int of the abdomen very long. 



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

 ments in the antennas, a point quite essential to th e definition of species. 



(See under C. phaleratus.) 



Cyclopi' longicauclatxvs and C. ignew are though! to be simply prematurely gravid 

 young of known species. 



(See Cragin. 1. c.,(pp. 12— 13 ) 



Cycl/jps fischeri of the same author agrees with C. se^uoreus in having six-jointed an, 

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

 able form, with uo seta on the antennae. 



FAMILY HARPACTICIDtE. 



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 Cyclopidae. The following characters are the more important 

 ones in distinguishing the family from the other families of the 

 order: 



