E. VON WILLEMOES-SUHM. 147 



think they had been seized by the current and carried away 

 from their breeding places, otherwise they would have been 

 more common. I found these larvae not only in Zamboanga, 

 but also during the night which we spent in the narrow channel 

 between Basilan and Malamani. At our return to the former 

 place another current had set in, bringing in pelagic animals 

 and sweeping away all the small larvae. 



After this we took to determining the surface animals, which 

 had been kept in spirit during the time when the [supposed] 

 young Limuli were found, and among them we got some more 

 larvae, so that satisfactory drawings, and also some prepara- 

 tions showing the Nauplius with only one eye and the larvae 

 with the additional large lateral eyes, could be made. (See 

 Plate VII.) 



The Nauplii [in question] are easily recognisable from the 

 position in which they hold their antennae, which are never 

 carried in an upward position, but always either at a right angle 

 to the body, in a horizontal position or directed backwards. 

 As soon as the animal rests or is touched by the covering glass 

 all the antennae take the latter position, which makes it rather 

 difficult to the observer to make them out. Another very 

 characteristic point in all the Nauplii, except in the very 

 earliest stage, is the pointed caudal portion, [which erroneously 

 suggested] the future spine [of a Limulus]. Even before 

 the large lateral eyes have come out, and before the divi- 

 sion of the body into three regions is complete, i.e. 

 after the first moult, this [larva supposed to be a] young 

 Limulus is very easily to be distinguished by the cordiform 

 shape of its body, its peculiar antennae, and the pointed 

 abdomen. This guided me with great certainty, for it is at 

 first by no means easy to find out the [supposed] small king- 

 crabs among the enormous number of larvae which swarm on 

 the surface near these tropical shores. 



In the first stage, the one in which I imagine the (supposed) 

 young Limulus to leave the egg, we see a somewhat oval-shaped 

 embryo filled with yolk and granulations, with one central eye 

 and three pairs of appendages (PI. VII, fig. 1). I am. 



