442 



CRUSTACEA. 



FIG. 351. a Later'Nauplius larva. A, anus ; 01, proboscis with 

 mouth; //, frontal horns; D, intestine ; A', A", 1st and 2nd 

 antenna; J.M/', mnndibular foot (third pair of appendages). 

 b, Metauauplius larva of Bcilanug befoie the moult. Beneath 

 the skin are the rudiments of the lateral eyes (O) and all the 

 appendages F' to F"' of the Cypris stage ; Ff\ frontal filament ; 

 0', unpaired eye ; Dr, gland cells of the anterior horns ; A', 

 the antenna 1 with suctorial disc ; MX rudiment of maxilla. 



Krohn, open 'on a 

 prominence on the 

 basal joint of the 

 anterior pair of 

 thoracic appen- 



dages. 



The eggs 



accumulate in the 

 cavity between the 

 mantle and the 

 body in large 

 thin - walled flat- 

 tened sacs, which, 

 in the Lepadidce, 

 are attached to a 

 fold of the mantle 

 and are packed to- 

 gether on the dor- 

 sal surface of the- 

 animal. 



In spite of the 

 hermaphrodit ism, 

 there are, accord- 

 ing to Darwin, in 

 certain genera 

 (Ibla, Scalpettuni) 

 very simply orga- 

 nised dwarfed 

 males of peculiar 

 form, the so-called 

 complement al 

 males, which are 

 attached like para- 

 sites to the body 

 of the hermaphro- 

 dite. There are 

 also dioecious Cir- 

 ripedes with a 

 strongly marked 

 dimorphism of the 

 sexes. This is the 

 case with Scalpd- 



