184 ^^^^ Philippine Journal of Science leis 



half of its dorsal surface 3 small, high tubercles, which are oval 

 in shape and widely separated from one another (fig. 10). These 

 tubercles are not beset with setse as in certain allied species. 

 In the middle of the distal margin there is a narrow fissure, cut 

 right through the telson, which extends as far as the level of 

 the lateral dorsal tubercles. On either side of it 4 broad mar- 

 ginal teeth are defined by means of triangular notches in the edge. 

 In this respect the species resembles G. nefandus and differs 

 from other forms in which the teeth are separated by narrow 

 and deep fissures similar to the central one. Each marginal 

 tooth bears a small spinule on its inner edge, and there is a series 

 of 7 or 8 still smaller spinules on the inner margin of each sub- 

 median tooth. 



The basal process of the uropods terminates in 2 spines, the 

 outer more than twice the length of the inner. There are 8 or 9 

 movable spines on the external margin of the proximal segment 

 of the outer uropod. The inner uropod is normal in shape and 

 bears setse all around its margin. 



This species forms one of a small group of closely allied 

 species which are somewhat difficult to determine with any 

 facility. The related forms are G. trispinosus Dana, G. pul- 

 chellus Miers, G. tuberosus Pocock, and G. nefandus Kemp. In 

 the form of its rostrum G. proximus agrees with the first two 

 of these species; it resembles G. nefandus with respect to the 

 incisions in the margin of the telson, and G. tuberosus in the 

 development of the dorsal processes of the ophthalmic somite. 



The absence of the mandibular palp is unexpected. The palp 

 is present and 2-segmented in all the closely allied forms (except 

 G. trispinosus, in which it has not been examined) , and from the 

 fact that it is similarly developed in the more distantl.y related 

 G. glaber Lenz, G. glyptocercus Wood-Mason, G. excavatus Miers, 

 and G. spinosissimus Pfeffer it was natural to conclude that the 

 character would be found constant throughout the section to 

 which all these species belong." 



The distinctions on which I rely for the discrimination of the 

 5 closely allied species of the trispinosus-growp are shown in tab- 

 ular form on page 185. Of G. trispinosus I have seen no 

 specimens ; the details given are derived from the excellent figure 

 and description which Borradaile has supplied.' Gonodactylns 

 tubel-osus, another species which I have not been able to examine 



' See Kemp, loc. cit., p. 146. 



' Proc. Zool. Soc. London (1898), 33, PI. V, fig's. 1, la. Additional notes 

 on this species recently have been published by Miss Rathbun, Proc. Zool. 

 Soc. London (1914), 663, PI. II, fig-s. 11, 12. 



