I913.] S. Kemp: Crustacea Stomatopoda of the Indo-Pacific 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 guerimi 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, ‘Yattersall, Cevlon Pearl Oyster Rep., V, p. 171, pl. i, figs. 11-15. 
1907. Gonodactylus acanthurus, 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. 
