I 1 2 



all the essential points, that scarcely any doubt about the identity of the two species is justified. 

 Alcock in his description states, that his 5. latifemur is "closely related" to 5. elongata, but 

 he gives no points of difference and compares his species only with 5. taeniolata White. From 

 his too short diagnosis we infer that the cT has a short transverse beaded crest on the inner 

 surface of the palm, and that the back of the movable finger bears a "milled crest" consisting 

 of about 40 transverse ridges; the finely-striated upper margin of the palm is not mentioned, 

 but something like it is indicated in his figure. 



This species has been first recorded by A. Milne-Edwards from the west coast of 

 Madagascar. Ortm.\nn afterwards collected it near Dar-es-Salaam and gave some specific 

 characters. Alcock mentioned his 5. latifeinnr from the Andamans. The discovery of this 

 species by the "Siboga" on the coast of Ceram and of New Guinea considerably extends its 

 known distribution. It seems to be entirely a marine species. 



From the measurements taken by de Man, Ortmann and Alcock it appears, that the 

 ratio by which the length of the carapace surpasses the distance between the external orbital 

 angles increases with advancing age, and this is corroborated by my material : in the very 

 young cf the latter dimension even e.xceeds the former. 



Dimensions in mm. : 



cT ') 9 



Distance between external orbital angles g.7 26.5 



Maximum breadth of carapace 10.4 30. — 



Length of carapace in the median line 9.1 27. — 



Width of front b.etween eye-stalks 5.3 15-25 



Posterior margin of carapace 4.6 12. — 



Length of cheliped — 31. 



Length of penultimate pair of walking legs . . . ' — 55. 



Length of meropodite , 8.8 22. 



Breadth of meropodite | I 4.2 11.; 



Length of carpopodite in the median line • of penultimate pair of legs \ — 11. — 



Length of propodite in the median line I i 16.5 



Length of dactylus ) ' j . 



2. Sesarina (Holotnctopiis) villosa A. Milne-Edwards. 



Literature: Tesch, Zool. Med. Mus. Leiden, v. 3, 1917, p. 20S, pi. 17, f. 2. 

 Stat. 64. Tanah Djampea, Flores Sea. 2 O juv. 



3. Sesarma (Sesarma) amphinome de Man. 



Literature: Tesch, Zool. Med. Mus. Leiden, v. 3, 19 17, p. 129. 

 Stat. 179. Bay of Kawa, west coast of Ceram. i ^ juv. on shore. 



4. Sesarma (Sesarma) gracilipes H. Milne-Edwards. 



Literature: Tesch, Zool. Med. Mus. Leiden, v. 3, 1917, p. 154. 

 Stat. 180. Pulu Kelang, between Ceram and Buru. i cT, in river. 



1) Measured under the microscope. 



112 



