1 



2 



3 4 



5 



6 



7 



9 



9 



C? Cf 



(J 



C? 



cT 



19.5 



18.— 



9.25 24.— 



25.— 



14.— 



8.8 



11.5 



11.1 



5.6 16.— 



18.— 



9.— 



5.9 



14.— 



13.3 



7.— — 



— 



— 



— 



164 ZOOLOGISCHE MEDEDEELINGEN — DEEL L 



Distance between external or- 

 bital angles 



Length of carapace • . 



Length of eye-stalks. 



Length of carpo- and propo- 



dite of the hinder pair of legs 6. — 6. — 5. — — — — — 



Greatest breadth of the propo- 



dite of the hinder pair of legs 1.75 1.6 0.75 — — — 



1 — 3 are specimens of the Leiden Museum, 4 is the „Gelasimus 

 telescopicus" of Owen, 5 is the „If. podophthalmus" of Souleyet, 6 is a 

 male mentioned by Alcock, 7 a young male spoken of by Miss Rathbun. 



We may remark, that the length of the carapace is always about 

 two-thirds its greatest breadth and never half this breadth or less, as in 

 the preceding species. 



M. latipes Borradaile. 

 1903. M. latipes Borradaile. Fauna Maldive etc., v. 1, prt 4, p. 433 f. 114. 



According to Borradaile's description and figure this species at first 

 sight resembles M. telescopicus by the length of the ocular peduncles, as 

 these outreach the outer orbital angle by more than a third of their 

 length ; the shape of this orbital angle is also much the same and there 

 are „faint traces of two mounds behind this tooth". The breadth of the 

 carapace is however somewhat more, the length to the breadth being as 

 5 : 8. The chelipeds of the male are small, much shorter than the first 

 pair of walking legs; the palm is much less high than in M. telescopicus, 

 apparently without rim near the under margin, and it is only the movable 

 finger that carries a blunt denticulated tooth. The meropodites of the 

 walking legs are slender, much less massive than in the preceding species, 

 and the nails are comparatively longer. The chief difference between the 

 two species consists in the form of the last two or three joints 

 of the hinder most pair of legs, which are remarkably 

 broad and flattened, unlike all other species of Macrophthalmus 

 so far as now described. The penultimate joint is broadly oval, nearly 

 circular, and the last joint is also paddle-like. Indeed, except for this 

 character, it is difficult to detect any real difference between the two 

 species here named, for my young specimens of M. telescopicus agree 

 almost exactly with Borradaile's species, the external orbital angle and 

 the first lateral tooth of the carapace, as well as the bent of the upper 



