THE CRUSTACEA OF NEW JERSEY. 123 



those of female. The iLsual difference in appendages, but while 

 second antennae increased in size not Ijranchcd as in most species. 

 Instead, at bases two large corrugated ridges of chitin, inclined 

 diag"onally, outward from mid line, which serve to prevent slip- 

 ping. Color as in female. Total length, 3.6 mm. 



(C. B. Wilson.) 



Remarks. — This species occurs upon the external surface and 

 always upon the dorsal side of the following fishes : Raja 

 erinacea, Tylositnis iiiariniis, Caraiiv hippos, ParalicJithys dcn- 

 tafiis and P. ohlongus. Wilson says: "When disturbed the males 

 scuttle about over -the surface in a lively manner, but the females 

 ordinarily remain c|uiet. In the aquarium both sexes swim about 

 freely, but the male is the more lively and usually lives longer. 

 They can be kept more successfully than many other species 

 and do not bother by crawling- up out of the w'ater. Females 

 with egfgs which are nearly ripe retain the ^gg strings even under 

 rough treatment, and the nauplii may be reared successfully. 

 The egg cases are separated rather more than usual at their 

 origin in the genital segment. At first they approach each other 

 rapidly until about their own diameter apart, and then extend 

 backward parallel with each other. They are light colored even 

 when well developed, so that it is difficult to judge of their ma- 

 turity by their color. This is due to the paucity of pigment in 

 the larvae." 



The species is only known from New Jersey Iw Wilson's 

 record from Great Egg Harbor, his material not having the 

 identity of the host. 



Genus CALIGUS Miiller. 



Caligus Miiller. Entomost. Insect. Dan. Norweg.. 1785, p. 128. Type Caligus 



ctiriiis Miiller, first species. 

 Clialiiinis Burmeister. Nov. .\ct. .\cad. Nat. Cur. Bonn., XVII, 1835. PP- 294, 



330. Type Chalimtis scomberi Burmeister, monotypic. 



Carapace large, shield-shaped. Basal joints of first antennae 

 furnished with lunules. Two terminal joints of first antennae 

 free, heavily armed with setne. Mandibles often toothed along 

 both margins. Second maxilla? simple, spine-like. First and 



