TETRAGONICEPS. LAOPHONTE. 157 



TETRAGOXICEPS MACRONYX, T. Scott. 



1892. Tetragoniceps ntacroni/.r, T. Scott, 10th Rept. Fishery Board 

 fur Scotland, pt. iii. p. 253, pi. x. tigs. 19-28. 



Dredged in St. Mary's Sound, Scilly Islands, in seven to 

 eight fathoms, bottom fine sand, May 1903; only one or two 

 specimens were observed. 



LAOPHONTE SERRATA (Glaus). (Pis. XIII. fig. G ; XVI. fig. G ; 

 XVII. fig. 5.) 



1863. Cleta serrata, Glaus, Die freilebendeu Copepoden, p. 123, pi. xv. 



tigs. 13-20. 

 1880. Laophonte serrata, Brady, vol. ii. p. 71, pi. Ixxiii. figs. 1-14. 



This Laophonte was moderately frequent in some of the 

 gatherings examined. Salcombe, 1875 ; Exmouth, 188-4; 

 Falmouth and at the mouth of the River Yealm, 1889. It 

 has more recently been taken on one or two occasions in 

 Plymouth Sound, and at St. Mary's, Scilly Islands. 



Laophonte serrata has a close general resemblance to the 

 next species, which appeal's also to be equally frequent ; but 

 in both the female and male of L. serrata the last abdominal 

 segment is provided posteriorly with a prominent spine on 

 the median dorsal aspect, as shown in the drawing (PL XIII. 

 fig. G). (Fig. G, PL XVI., & fig. 5, PL XVII., represent 

 the third and fifth thoracic feet of the male.) 



LAOPHONTE INORNATA, A. Scott. (Pis. XII. fior. 5 ; XIII. 

 figs. 5, 14 ; XIV. fig. 7 ; XVI. fig. 5 ; XVIII. figs. 3, 4 ; 

 XXI. fig. 3.) 



1902. Laophonte. inornata, A. Scott, " On some Red Sea and Indian 

 Ocean Copepoda," Trans. Liverpool Biol. Soc. vol. xvi. p. 413, 

 pi. i. tig. 10 ; pi. ii. figs. 9-14. 



This species, the female of which was described by A. Scott 

 in the paper referred to above, bears a moderately close 

 resemblance to L. serrata, Glaus, but it is rather smaller 

 than that species, and wants in both the female and male 

 the posterior dorsal spine with which both sexes of that 

 species is armed. There are also some structural differences 

 between the two species which can only be satisfactorily 

 made out by dissection, and a few of these differences will 

 now be described. 



The antennules in both sexes in L. inornata have the 

 second joint produced exteriorly into a prominent tooth-like 

 process, having a broadly conical outline as shown in the 

 drawings (PI. XII. fig. 5, and PL XXI. fig. ?,). The female 

 antennules are, c< ' . seven joints (^/. fig. 5). 



