138 DE. J. Q. DE MAN ON THE PODOPHTHALMOUS 



the shape of the eephalothorax, which is not globose, but rather 

 depressed and distinctly broader than long. In other respects 

 Dioxippe appears most closely allied to Dotilla and Scopimera, 

 especially to the former. The external maxillipeds much re- 

 semble those of Dotilla, differing from those of Scopimera. They 

 meet along their inner margins ; the quadrangular ischium- 

 joint is a little broader than long, and presents on its smooth 

 outer surface a transverse arcuate piliferous line proceeding 

 from the middle of the external margin towards the internal half 

 of the anterior margin. The commissure between this joint and 

 the merus-joint is transverse. The merus-joint is a little longer 

 than the ischium-joint, and has the same form as in the genus 

 Dotilla ; but it presents only a single longitudinal groove quite 

 near the external margin, without any trace of the grooves that 

 characterize most species of Dotilla. The anterior margin is 

 very narrow and slightly concave, and bears the palpus near the 

 external angle. The eephalothorax does not present the singular 

 grooves of the genus Dotilla. The front is narrow, the orbits 

 more or less oblique and elongate ; their inferior margin is very 

 prominent, its external angle even constituting a prominent obtuse 

 triangular lobe in Dioxippe orientalis. The meropodites of the 

 ambulatory legs present more or less distinct traces of the sin- 

 gular " tympana " which are so much developed in Dotilla, and 

 still more in Scopimera. 



I thus retain the genus Cleistostoma for de Haan's Gleisto- 

 stoma dilatata. 



As regards C. tridentata, A. Milne-Edw., from Upolu, I do 

 not venture to decide whether this species ought to be referred 

 to Cleistostoma as restricted by me or not. 



80. Dioxippe okientalis, n. sp. (PL IX. figs. 8-10.) 

 Seventeen specimens were collected in the Mergui Archipelago ; 

 all are males, except one single ova-bearing female. 



Dioxippe orientalis is probably somewhat allied to Scopimera 

 inflata, A. M.-Edw., from the Indian seas (' Journal des Museum 

 Goddefroy,' Heft iv. 1873, p. 7) ; but this form is certainly dif- 

 ferent, because the anterior legs are described as being minutely 

 granular, and the absence of the " tympana " is not mentioned 

 by the learned author. Our Dioxippe is of small size, like the 

 species of Dotilla and Scopimera, and resembles to a certain ex- 

 tent some of the species of Seloecius, e. g. S. inornatus, Dana. 



