10. 
10’. 
alate 
lila 
12. 
We 
13. 
13’. 
102 
Sub-median skeleton with two pairs of processes (second and third pairs) between the 
bases of the maxillipeds. Terminal sete of the caudal stylets somewhat longer than 
save) [ORIEL afoyoan, Csi (ne) Ine 5 5 oo hk oo ooo 11. S. paradoxa 
Sub-nedian skeleton with only one pair of processes (second pair) between the bases 
of the maxillipeds. Terminal sete of the caudal stylets scarcely the length of the 
basal jointof thesmaxillipeds. 5.2.4 1 < svar Sy) sen eee eee nen eae 8 
Basal joint of the maxille without any prominent plate........ 16. S. intermedia 
Basal joint of the maxillze with a prominent plate with spiniform marginal processes 
round the distal, inward and backward turning angle. ......... 17. S. capensis 
Terminal seta of the caudal stylets somewhat longer than the terminal seta of the 
Outersbranchyor ihe mtinstspalrsotelees| ae eye icneieae nen mene ena nee 12. S. abyssi 
Terminal seta of the caudal stylets a little or much shorter than the terminal seta of 
the outer branchwofethe firsts paliao ly 10'S eure memes ens 10 
Terminal seta of the caudal stylets at least four to six or eight times longer than the 
stylets, and much longer than the secondary seta of the outer branch of the first pair 
OF VOSS jee ro he icc et Ra a Can acta On ar 11 
Terminal seta of the caudal stylets only about three times the length of the stylets 
and not longer than the secondary seta of the outer branch of the first pair of legs. 
13. S. Argisse 
Terminal seta of the inner branch of the first pair of legs equal in length to, or longer 
than the distance between the base of the same leg and the end of its outer branch. 
14. S. Metope 
Terminal seta of the inner branch of the first pair of legs somewhat shorter than the 
distance between the bases of the same legs and the apex of their outer branch. 
15. S. Holbélli 
First pair of legs with a long seta at the apex of the single branch, none on the 
OUMAMANKIOTI BI oO Re ube o Gok bb mona oenaadoe yoo 6 18. S. Gitanopsidis 
First pair of lees with two branches, the terminal sete of which are shorter than the 
leg: va.seta, On the ontersprocessi=... as) see eene ene ee eee 13 
Trunk not much larger than the head, with setaceous hairs, proceeding two or (generally) 
(TRESS TCM UR indy HEN co ooo doo oe npooo oon evo DoS 19. S. Giardii 
Trunk more than double the size of the head, with moderately thin, normal hairs. 
20. S. Bonnier. 
About species 1—8: Group of Spheronella Leuckartii. 
In seven species belonging to the genera Paratylus G.O. Sars, Cheirocratus Norm., 
Leptocheirus Zadd., Gammaropsis Lilljbge., Microprotopus Norm. and Corophiwn Latr., taken 
in Denmark, Sicily, Cuba and Hong-Kong, I have found parasites which bear a close resem- 
