CRTTSTACEA OF THE MEEaUI ABCHIPELAGO. 129 



The ambulatory legs are similar to tliose of M. quadratus, and 

 their margins are clothed with some hairs. The meropodites of 

 the legs of the third and fourth pair are armed on their upper 

 margin, a little before the distal end, with an acute spinule, but 

 those of the second and fifth are unarmed. The meropodites are 

 minutely denticulate along the distal half of their under margin, 

 especially those of the legs of the third and fourth pair ; this 

 denticulation, however, is so minute that it is only visible by 

 means of a strong magnifying-glass. 



Dimensions : — 



c?. ?. 



millim. millim. 



Distance between the external orbital 



angles 9-|- 11 



Distance between the second antero-lateral 



teeth 9i llf 



Length of the cephalothorax , . . 6| 7-| 



Breadth of the front, between the eye- 

 peduncles 2 2^ 



Length o£ the band (fingers included) .... 8 41 



Grenus Dotilla, Stimps. 



I propose to unite this with the genus Scopimera, de Haan, 

 as the two present distinct natural afiinities ; they not only 

 resemble one another as regards their outer appearance and 

 their essential characters, but both are provided with the sin- 

 gular " tympana " on the merojpodites, rarely also on the sternum, 

 which, so far as I am aware, are not found in any other Crus- 

 tacea. De Haan separated the Seopimerce from the Dotillod 

 on account of the merus-joint of the outer maxillipeds being 

 longitudinally sulcate in the DotillcB and smooth in the ScopimercG. 

 This character, however, is now proved to be only of specific 

 value by a new species in the collection. The form in question 

 agrees closely with the true Dotillod, and more especially resembles 

 Dotilla sulcata ; but the merus-joint of the external maxillipeds 

 shows only partially the longitudinal grooves characteristic of 

 Eorskal's species. 



Three species of Dotilla have hitherto been described : the long- 

 known D. sulcata, Forsk., from the Red Sea, D. myctiroides, 

 M.-Elw., from the coast of Malabar,and D fenestrata^ Hilgend,, 

 from the eastern coast of Africa. 



LINN. JOUKN". — ZOOIiO&T, YOL. XXII. 9 



