EXPLANATION OF PLATES 

 EXPLANATION OF PLATES 



45 



The following letters apply to all the figures : — 



O. S. 



o. 



PH. 

 P. PH, 

 CE 

 L 



V. S. 

 E. V. 

 E.- 

 O. 



oral sucker 

 head glands 

 pharynx 

 prepharynx 

 oesophagus 

 intestine 

 ventral sucker 

 excretory vesicle 

 excretory system 

 ovary 



U. 



R. S. 



T. 



V. D 



G. P. 



P. P. 



C. 



C. S. 



V. SEM. 



EG. 



uterus 



receptaculum seminis 



testes 



vas deferens 



genital pore 



pars prostatica 



cirrus 



cirrus sac 



vesicula seminalis 



eees 



Plate L 



Fig. I, Cercaria glandosa (length 0'20 mm.) from Pabidestrina stagnalis. 



Fig. 2. Cercaria macoiiicB (length 0*70 mm ) from Macoma balthica. 



Fig. 3. Cercaria strigata (length 0*40 mm.) from Tellina teniiis. 



Fig. 4. Cercaria corophii (length 0'34 mm.) from Corophiiim grossipes. 



Fig. 5. ,, ,, (o'i6 X o '14 mm. ) encysted. 



Fig. 6. Cercaria balani (length about i mm.) from Balaiuis balanoides. 



Fig. 7- J) )) (o'04 mm.) encysted. 



Fig. 8. Cercaria carcini (length 0*54 mm.) from Card nits mcenas. 



Fig. 9. ,, ,, (cyst 0*40 X o*35 mm.) escaping from cyst. 



Fig. 10. Cercaria encysted in Carcimis mo'uas (o'l3 mm.) 



Plate IL 



Fig. I. Cercaria dichotonia, Mliller (length 0"20 mm.) from Scrohicularia 

 tenuis. 



Fig. 2. Sporocyst of Cercaria dichotonia. 



Fig. 3. Stephanochasmus baccatus, Nicoll (?), pressed out of cyst (length 



Fig. 4. 

 Fig. 5- 

 Fi?. 6. 



2'9 mm.) from Dab. 

 (encysted) 

 head 



cirrus sac 



Plate IIL 



Fig. I. Derogenes va7-icus (O. F. Miill.), (length 3 mm.) from Long 



Rough JJab. 



Fig. 2. ,, ;, with parasitic Copepod. 



Fig. 3. Parasitic Copepod, 



Fig. 4. Steringophorus ovacnfiis., n.sp. (length 2*3 mm.) from Long 



Rough Dab. 

 Fig. 5. Egg of S. oTactctiis. 



