PALAEMON ORNATUS. 



171 



7 

 Gorontalo (Celebes), lias the rostrum - dentate , reaching 



beyond the peduncle of the internal antennae, and the 



second pair of legs are rather unequal, being 85 mm. 



and 75 nïm. long respectively. 



The Leyden collection contains 7 middle-sized specimens 



from the island of Morotaï , which present some remarkable 



differences in the shape of the second pair of legs. They 



belong positively to the form , described by Mr. Heller as 



a proper species under the name of Palaemon vagus Hel- 



7 9 



ler: the rostrum is dentate and reaches to the end or 



' 2—3 



rather a little beyond the end of the peduncle of the in- 

 ternal antennae. The second pair of legs are slender both 

 in the male and in the female , and they are thinner than 

 in the typical specimens of Pal. ornatus ; they are equal or a 

 little unequal in the male , and the fingers which are 

 toothed but closely united to one another, are rather 

 shorter than the palm and somewhat longer than the wrist. 

 Likewise in the female. — Thus a male of the length of 

 90 mm. has the second pair of legs equal in size , being 

 75 mm. long, the arm measuring 15 mm., the carpopodite 

 13 mm., the palm 16 mm., and the fingers 15 mm. Another 

 male specimen, 100 mm. long, presents the legs of the 

 second pair unequal in size and more slender, being 90 mm. 

 and 65 mm. long respectively , and of the larger leg the 

 arm measures 19 mm., the wrist 17 mm., the palm 21 mm. 

 and the fingers 17 mm. A female specimen 100 mm. long 

 has the legs of the second pair equal in size , the length being 

 80 mm., the arm measuring 17 mm., the wrist 14 mm., 

 the palm 19 mm. and the fingers 16 mm. These Morotaï 

 specimens however closely agree for the rest with the ty- 

 pical Fal. ornatus , except in the remarkable differences 

 of the second pair of legs , so that I conclude with Mr. 

 von Martens this form to be only an interesting variety 

 of Pal. ornatus Oliv., perhaps even a local variety. 



There are finally several specimens of a Palaemon , col- 

 Notes from the Leyden ]VIiiseuni. 



