267 



9juv. 



9juv*. 

 C.9JUV. 



9mp. 



9 P ip. 



9puii*. 

 c.9puii, 



Young female, with not yet fully 



developed incubatory plates; dorsal 



view. 



Same, ventral view. 



Same, anterior part of body, dorsal 



view. 



Maxilliped of adult female. 



Leg of same. 



Pleopod. 



Terminal piece of tail, ventral and 



lateral views. 



Very young female, immediately 



after the transformation; dorsal 



view. 



Same, ventral view. 



Same, cephalon and adjacent parts, 



from below. 



PI. 89. 



1. Athelg'es tenuieaudis, G. 0. Sars. 



X. A specimen of Spiropaqurus cliiro- 



acanthus infested with this parasite ; 



dorsal view. 



9ad. Adult female, ventral view. 

 9>ad*. Same, viewed from right side. 

 9,juv. Young female, with attached larval 



male ; dorsal view. 

 9juv*. Same, ventral view. 

 Urs. Extremity of tail of adult female ; 



dorsal view. 



Urs.juv. Same part of a young specimen. 

 Pip. Pleopod. 



cf ad. Adult male, dorsal view, 

 cf juv. Young male in last larval stage ; 



dorsal view. 



PL 90. 



2. Athelges bilobus, G. 0. Sars. 



9juv. Immature female, with attached 



male ; dorsal and ventral views, 

 cf. Male, ventral view. 



PI. 90. 

 Phryxus abdominalis (Kroyer). 



A specimen of Spirontocaris sccuri- 



frons infested with this parasite, 



viewed from left side (legs of the 



host omitted). 



Adult, dextrorsal female; ventral 



view. 



Same, with attached male; dorsal 



view. 



Right part of body of another, 



sinistrorsal specimen; dorsal view. 



Same part from below, showing the 



5 densely crowded incubatory plate 



on right side, as also the oral area, 



and the inner lamellae of the ple- 



opoda. 



Terminal piece of tail. 



Maxillipeds. 



Leg of 1st pair with pertaining 



incubatory plate. 



X. 



9. 



9*. 



9 2 

 9 2 *. 



t. 



mp. 

 P 1 - 



p 4 . Leg of 4th pair. 



p 5 - 7 . Small rudiments of the 3 posterior 

 legs found on right side within the 

 angle between trunk and tail (see 



fig- 9 2 *-) 



cf. Adult male, dorsal view. 



Ccf . Cephalon of same, ventral view. 



pcf Leg of same. 



PI. 91. 

 Phryxus abdominalis (contin.) 



9JUV 1 . Young, dextrorsal female, with the 

 incubatory plates not fully develo- 

 ped, and having still the full num- 

 ber of legs on both sides; ventral 

 and dorsal views. 



9juv 2 . Immature female, with attached 

 larval male, and exhibiting incipient 

 dextrorsal torsion ; ventral, dorsal 

 and lateral views. 

 Same, front part of cephalon from 

 below. 



C9juv 2 . 

 9.juv 3 . 



Very young, vermiform female, 



with attached larval male; lateral, 



dorsal and ventral views, 

 cflarv. Young male in last larval stage; 



dorsal view. 

 Ccflarv. Same, cephalon and 1st pedigerous 



segment from below (left antennal 



flagellum and right 1st leg omitted). 

 Urs. cflarv. Same, extremity of tail, dorsal 



view. 

 Embr. Embryo in last stage, dorsal, ventral 



and lateral views. 



PI. 92. 



Mieroniseus-stages. 



i. 



A specimen of Pseudocalanus elon- 



gatus infested with 2 Micronisci of 



different development; dorsal view. 



Youngest stage observed, dorsal 



view. 



Same, ventral view. 



la. urp. Same, uropod. 



Ib. Subsequent stage, exhibiting the 



first trace of the 7th pair of legs; 

 ventral view. 



Ic. More advanced stage, dorsal and 



ventral views. 



Ic. p 6 . i'ame, leg of 6th pair. 



Ic. p 1 . Same, leg of 7th pair, in process 

 of formation. 



Id. Lust Microniscus-slage, dorsal and 



ventral views. 



Id. p. S;mie, leg of 7th pair. 



Id. urp. Same, uropod. 



2. A specimen of MetrltUn Intifja in- 



fested by another form of Micro- 

 nisctis; viewed from right side. 



2a. The Microniscus isolated, and 



viewed from above. 



2b. Another specimen just about to 



cast off its skin: dorsal view. 



la. 



la*. 



