SEA-FISHERIES LABORATORY. 



237 



om. muscles of the oviduct. 



vd. vas deferens. 



os. ovisacs. 



vu. vulva. 



ov. ova. 



y. opening of digestive duct 



p L first pair of feet. 



into the stomach. 



p iL second ,, 



z. pore canals. 



pin. third 



Nos. 1 to 13 nerves, as 



piv. fourth ,, 



follows : — 



p v - fifth 



1. optic. 



pg. pigment. 



2. antennules. 



B. right. 



S. antennae. 



r. rostrum. 



4. mandibles. 



rep. receptaculum seminis. 



4a. lateral frontal margins. 



rt. rectum. 



4b. first maxillae. 



rtn. retina. 



5. second maxillae. 



ry. fin ray. 



5a. lateral cephalic muscles. 



S. spermatozoa. 



6. first maxillipedes. 



sbg. suboesophageal 



7. second maxillipedes. 



ganglion . 



8. first feet. 



sf. sternal fork. 





8a. stomach muscles. 



sg. cement gland. 





9. second feet. 



sp. spermatophore. 





spg. supra-cesophageal 



9a. posterior cephalic 



ganglion. 



muscles. 



st. stomach. 



10. third feet. 



t. testis. 



11. fourth feet. 



V. ventral. 



12. abdomen. 



va. vagina. 



13. fifth feet. 



Plate 1. 

 Fig. 1. Lepeophtheirus pectoralis, mature female, dorsal 



view, x 17. 

 Fig. 2. Lepeophtheirus pectoralis, mature male, dorsal 



view, x 17. 

 Fig. 3. Lepeophtheirus pectoralis, nauplius stage, newly 



hatched, x 52. 



