24 



BULLETIN" 201, UNITED STATES NATIONAL MUSEUM 



The point I wish to make is that a great deal more information is 

 required as to the changes which accompany growth in this genus and 

 also on the extent of individual variation in adults. The described 

 species are all of them very closely allied, and I do not feel that they 

 have all been separated on characters of sufficient importance, or 

 which cannot be explained either as growth changes or variations. 

 Future workers with more material at their command may well pay 

 attention to the points I have raised. I think it is more than probable 

 that the number of valid species will be reduced by more extensive 

 investigation. 



PARALOPHOGASTER ATLANTICUS Tattersall 



Figures 2, 6, c 



Paralophogaster glaber Tattersall, 1926, p. 8. 

 Paralophogaster atlanticus Tattersall, 1937, p. 4, figs. 1, 2. 



Occurrence. — West Indies : Johnson-Smithsonian expedition, 1933 : 

 station 6, series number 27, latitude 18°30'45" N., longitude 66°0'50" 



Figure 2. — Lophogaster japonicus, new species: a, Lateral view of carapace to show tuber- 

 culation; b, Paralophogaster atlanticus Tattersall, dorsal view of anterior end to show rostral 

 plate, eyes, antennular peduncle, and antennal scale, X 25; c, P. atlanticus Tattersall, 

 telson and uropods, X 25. 



W., 100 fathoms, February 1, 1933, 1 specimen; station 29, series num- 

 ber 173, latitude 18°40'30" N., longitude 66°21'15" W., 260 fathoms, 

 February 8, 1933, 1 specimen; station 30, series number 175, latitude 

 18°40'30" N., longitude 66°36'15" W., 1,200 fathoms, February 8, 



