1913-]' S- Kemp: Crustacea Stomato-poda of the Indo-Paciflc Region. 193 



6. The telson is covered with regularly arranged spines with fleshy appendages 



similar to those on the preceding segment, twenty-two of the largest occupy- 

 ing the median area. The customary tubercles are again absent. On the 

 distal margin there are four long spine-like processes which bear secondary 

 spines on their edges. These processes are separated by three deep subequal 

 notches which, though much wider than the narrow fissures found in 

 G. pulchellus and its allies, are nevertheless parallel-sided : the median fissure 

 does not take the form of a wide gap or emargination as in the five preceding 

 species. 



7. The inner uropod bears five immovable spines placed in a longitudinal row on 



its dorsal surface. 



The function of the curious fleshy processes on the tips of the spines of the last two 

 segments is wholly unknown, and in their possession the species is unique among Stoma- 

 topoda. 



Brooks notes that his spirit specimen was brown with a pale transverse band on the 

 carapace. 



Only two examples of Gonodactylus guerini are known. The type, a male 57 mm. 

 in length, was found by H.M.S. ' Herald ' at the Fiji Is. (White, Miers) ; the second 

 example, a female 28-5 mm. in length, was obtained by H.M.S. ' Challenger ' at Hono- 

 lulu (Brooks). 



26, Gonodactylus acanthurus, Tattersall. 



1906. Gonodactylus acanthurus . Tattersall, Ceylon Pearl Oyster Rep., V, p. 171, pi. i, figs. 11-15. 



1907. Gonodactylus acantMirus, Borradaile, Trans. Linn. Soc. Zool. (2), XII; p. 210. 



The carapace is about one and a third times as long as broad ; its anterior margin 

 trends forwards on either side of the rostrum, so that the subacute antero-lateral angles 

 are in advance of the rostral base. The rostrum is trispinous ; the median spine is 

 long and reaches almost or quite to the middle of the eyestalks, while the laterals are 

 decidedly shorter than in most species of the preceding group, and fail to reach the base 

 of the eyestalks. The cornea of the eye is narrower than the stalk and is set very 

 obliquely on it. The antennular peduncle is extremely short and is exceeded in length 

 by the eyestalks. 



The mandibular palp is entirely absent. 



There is a long movable spine at the proximal end of the raptorial propodus on its 

 upper margin, and the external edge of the dactylus is feebly notched at the base. 



The last three thoracic somites have the usual form, and the first five segments of 

 the abdomen are entirely smooth except for the customary ridge along the lateral and 

 antero-lateral margins and for a few microscopic pits on the dorsal surface. The postero- 

 lateral angles of the first four are rounded, those of the fifth subacute. 



The posterior margin of the sixth somite is almost straight in dorsal view and 

 bears six smooth longitudinal ridges ; the submedians are swollen, both higher and 

 broader than the intermediates and the laterals are co-terminous with the spinous 

 postero-lateral angles. The submedian and intermediate ridges do not terminate in 

 spines. 



