THE CRUSTACEA OF NEW JERSEY. 281 



Massachusetts. It is usually found clinging to the gills, or under 

 surface of the opercular region, in the gill-opening of its host. 

 The hosts now given are Pristis semisagittatus, Trachurops 

 cnmvenophthalmus, Poriiatomus saltatrix, Sten'otomus chrysops, 

 Cynoscion regalisf, Lagodon rhomboides and Micropogon un- 

 dulatiis. Of all these it is most numerous in the gill-opening of 

 young Pomatomiis, and in some places along our shores these fish 

 are sometimes angled by seashore excursionists for the amuse- 

 ment and excitement of locating as many "bugs" as possible. 

 They are sometime present in most every individual taken, and 

 a whole day's catch may reveal as many parasites as fish, some- 

 times two or three in rare instances on a single host. I have ex- 

 amined a number of specimens from Barnegat Pier, Atlantic City, 

 Ocean City and Cape May. Mr. W. T. Davis secured one from 

 Tmitoga onitis near New York City, which I have also seen. 



Genus CERATOTHOA Dana. 



■Ceratothoa Dana, U. S. Expl. Exped. Crust., XIV, 1853, p. 752. Type 

 Cerafothoa linearis Dana, first species. 



Body oblong. Head but little immersed or set in first tlioracic 

 segment, not produced posteriorly in three lobes. Epimera of 

 first segment of thorax, in female, with carina produced in 

 form of spoon or tubercle and, directed anteriorly. Anterior 

 epimera not reaching by great though gradually decreasing 

 distance to hind angle of segment. Posterior epimera almost 

 reach or extend a little beyond posterior angles of segments. 

 Abdomen deeply immersed or set in thorax, and terminal seg- 

 ment transverse. Eyes small. Antennce very much dilated, 

 first pair dilated and contiguous at base, and second pair com- 

 pressed. Front edge of first thoracic segment rounded. Legs 

 rather long, except first and second pairs. Ungulae long and 

 strongly curved, of third pair in female longest of all, and also 

 abruptly longer than those of second pair. High carina on 

 basis of four posterior pairs of legs. 



In this genus the male is smaller than the female. One 

 species in our limits. 



