68 CARCINOLOGICAL STUDIES. 



16. Xen op ht halmodes Moehii Richters. 



(PI. 3, fig. 5). 



Xenophthalmodes Moehii, Richters, Beitrage zur Meereefauna der Insel 

 Mauritius und der Seychellen, 1880, p. 155, PI. XVI, fig. 28, PI. 

 XVII, fig. 1 — 5. 



A single male from the Red Sea, collected by Mr. J. A. 

 Kruyt at Djeddah. 



On this interesting form the following may be remarked. 



According to Mr. Richters the corneae of the eyes should 

 be entirely obliterated in this species , which therefore 

 should be perfectly blind. In the Djeddah specimen, however, 

 I observe an extremely small, punctiform, dark- 

 coloured cornea (fig. 5) , placed near the external 

 extremity of the lower margin of the orbits; this minute 

 cornea may best be seen when light falls in an oblique 

 direction upon it and then it appears, under a magnifying- 

 glass, as a black point. Richters does not say much about 

 the external foot-jaws, but in his figure 5 the anterior 

 and the external margins of the merus-joint seem to make 

 together a continuous arcuate line. In our specimen, however, 

 the merus-joint (fig. 5a) is distinctly quadrangular, 

 the anterior margin nearly straight or very slightly arcuate, 

 a little oblique and somewhat longer than the external 

 margin ; there is a distinct angle between the two margins, 

 and the palp is inserted at the antero-internal angle of the 

 joint. 



A third difference finally presents the abdomen (fig. 5^), 

 the third, fourth, fifth and sixth joints of which are some- 

 what shorter and appear therefore more enlarged than in 

 the figure given by Richters ; the terminal joint is a little 

 longer than it is broad at the base. 



For the rest our specimen agrees perfectly well with all what 

 Richters says and figures, and I therefore suppose our spe- 

 cimen to belong to the same species. 



The whole animal is of a pale grayish colour and the 

 upper margin of the mobile finger of a porcelain-white. 



Notes f'roin tlie Leyden JMuseimx , Vol. XII. 



