192 Memoirs of the Indian Museum. [Voi,. IV, 



The basal segment of the uropods bears one or two sharp spines on its dorsal surface 

 at the proximal end, and the inner spine of its ventral process is fully two- thirds the 

 length of the outer. There are nine to eleven movable spines on the external edge of 

 the basal segment of the exopodite. 



The colouring of living specimens is rather constant. The whole dorsal surface 

 of the carapace and abdomen is densely maculated with dark brown tending to red or 

 purplish red at the anterior margin of each post-abdominal segment and especially well- 

 defined on the fourth and fifth abdominal somites. There is a pale transverse band a 

 little behind the middle of the carapace and, frequently, a large subquadrate pale patch 

 on the last thoracic and third abdominal somites close to the posterior margin. The 

 sixth abdominal somite and telson, with their investing spines, are red or dull purplish 

 red, the boss-like prominences usually paler. The antennular flagella are orange yellow ; 

 the eyes black with mottled brown stalks. The merus of the raptorial claw is pale or 

 mottled with brown and the dactylus is suffused with red. 



The specimens in the Indian Museum are registered as follows : — ■ 

 ^° N. Cheval Paar, Ceylon. T. Southwell. 6 J 1 , 10 ? , 12-34 m m. 



Ceylon. 



ex coll. Herdman. 



1 9 , 28 mm. 



Pearl Ranks, Ceylon (from Spongodes). 



T. .Southwell. 



1 d 1 , 25 mm. 



Gonodactylus spinosissimus has been recorded from several localities in the neigh- 

 bourhood of Ceylon (Tattersall), from the Red Sea (Nobili),and from Zanzibar (Pfeffer). 

 It is usually found in shallow water, but Tattersall records it from 45-50 fms. on Muttu- 

 varatu Paar. 



25. Gonodactylus guerini, White. 



1861. Gonodactylus guerinii, White, Proe. Zool. Soc, p. 43, pi. vii, and Ann. Mag. Nat. Hist. (3), 



VII, p. 480. 

 1880. Gonodactylus guerinii, Miers, Ann. Mag. Nat. Hist. (5), V, p, 121. 



1886. Protosquilla guerinii, Brooks, Voy. H.M.S. 'Challenger,' XVI, Stomatop., p. 75, pi. xvi, 

 figs. I, 6. 

 This peculiar species, which is not represented in the Indian Museum, is perhaps 

 distantly related to G. spinosissimus. According to Brooks' excellent description it 

 may be distinguished by the following characters : — 



1. The antero-lateral angles of the carapace are broadly rounded. 



2. The median spine of the rostrum is a little shorter, and the basal undivided 



part is, according to Brooks' figure, considerably longer. 



3. The first four abdominal somites have a small sharply defined indentation on 



each side at about one-third the distance from the lateral edge to the middle. 



4. The posterior part of the fifth abdominal somite bears six transverse rows of 



short spines, and is separated from the smooth anterior part by a curved trans- 

 verse line. 



5. The sixth abdominal somite is armed with very numerous long cylindrical 



spines each of which ends in a blunt rounded tip from which a soft tubular 

 fleshy process protrudes. The customary tubercles appear to be absent. 



