442 



CRUSTACEA. 



Fie. 351. a Later'Nauplius larva. A, nnus; 07, proboscis with 



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

 antenna?; Mdf, inaiidibular foot (t.liinl pair of appendages). 

 5, iletanauplius larva of Jialanng befoio the moult. Beneath 

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

 appendages F> to F 1 * of the Cypris stage ; Ff, frontal filament ; 

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

 the antenaic with suctorial disc ; MX rudiment of maxilla. 



Krohn, open on a 

 prominence on tlio 

 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- 

 tal surface of the 

 animal. 



In spite of the 

 hermaphrodit i s m, 

 there are, accord- 

 ing to Darwin, in 

 certain genera 

 (Ibla, Scalpellum) 

 very simply orga- 

 nised dwarfed 

 males of peculiar 

 form, the so-called 

 comp lementat 

 males, which are 

 attached like para- 

 bites 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 Scalpel- 



