lyOJ.J CBUBTACEA OF THE " SKEAT EXPEDITION." '>*'<■'< 



variation I have indicated, quite constant in the numerous speci- 

 mens under review. The typical specimens of Dr. de Man's species 

 were obtained from a tidal river at Balangnipa in Celebes ; other 

 typical specimens were also obtained from brackish water in 

 •Sumatra, and from fresh water at Maros in Celebes, and Pampanua 

 in Celebes. Fifteen young individuals from the river Lapa-lupa in 

 Celebes agree with the present form in the number of teeth = 



' : ',L I. " '. hut •• Sie Stimmen,was Form und Lange des Rostrums 



betrifft, mit den von Balangnipa uberein," i.e. typical; so, too, with 



a young specimen from Mbawa in Flores. with formula -ht-. The 



number here seems to vary with age ; the relative length of the 

 rostrum seems to lie characteristic. In view of this latter fact, and 

 in view of the fact that Dr. de Man had specimens from both 

 brackish and fresh water which agree iu this particular character, 

 in view, moreover, of the fact that the nature of the water in the 

 present case is uncertain, it seems necessary to dismiss the possi- 

 bility that this form is a variety of 0. gracilirostris, characterized 

 by a rostrum shortened through relation to a somewhat different 

 environment, and to regard it as a distinct species, closely allied to 

 C. gracilirostris, but differing in (a) a shorter rostrum, with a conse- 

 quent diminishing of the lower row of teeth ; (6) a fewer number 

 of teeth on the dorsum of the telson ; and (c) having the legs of 

 the 1st and 2nd pair relatively slightly shorter. 



XLT. Genus Hippoltbmata Stimpson. 



68. HlPPOLYSMATA TITTATA StimpSOll. 



Hippolysmato vittata, Stm. Proc. Ac. Nat. Sci. Philad. p. 2G 

 ( I860); de Mau, Arch. f. Naturg. liii. i. p. 494 (1887). 



hoc. Pulau Bidan, Penang. 



Five males and six females, length from 25 mm. to 10 mm. 



The rostral teeth are evidently very variable in this species. 1 



give the formula iu each case ; in all but one the first tooth on the 



carapace is separated from the second by a distance double that 



between the other teeth, but in that one (a female with ova) all 



the teeth are equidistant. 



, , , 88887777706 



nostra! tormulae : — ,• i> r.< o' ~y .»' «■>> q> ^> r>» 5" 



XL1 1. Genus Alpheus. 

 Hi'. Ai.pheus lobidexs de Haan. 



Alpheut lobideru, de I hum. Crust, .lap \>. 179(1839); Ortmanu, 

 Zool. Jahrb. v. p. 17 4, pi. xxzvi. fig. 13 (1SU1). 



Loc. Pulau Bidan, Penang; Kelantan. Sixteen individuals from 

 Pulau Bidan, three from Kelantan. 



Length from ,; 7 nun. 



