Boone, Crustacea, Cruise of "Alva," 1931 11 



SYSTEMATIC DISCUSSION. 



Order: STOMATOPODA. 



Family: SQUILLIDAE. 



Genus: GONODACTYLUS Latreille. 

 Gonodactylus chiragra (Fabricius). 



Plates 1 and 2. 



Type: Fabricius' type locality is cited: " Habitat in Oceano Auf- 

 trali. Muf. Dam. Banks." 



Distribution : This species is very widely distributed in the Indo- 

 Pacific region. It is abundant in Oceania and ranges as far east as 

 the Marquesas Islands, from which group of islands the ''Alva" 

 specimen appears to be the first record. Northward it extends as far 

 as Japan. On the Australian coast it has been recorded as far south 

 as the Swan River in the west and Port Molle in the east. On the 

 African coast it extends from Natal Point northward to the Red Sea 

 and Gulf of Suez. In depth it ranges from the shore down to 50 fms. 



Material examined: One specimen taken in coral at Teviatoa 

 Reef, Raiatea Island, Society Islands, August 21, 1931. One, Muller's 

 Reef, Bora Bora Id., Society Is., August 24, 1931. One specimen, 

 35.5 mm. long, taken on coral reef at Anaho Bay, Nuka Hiva Island, 

 Marquesas Islands, August 10, 1931. One young specimen, about 

 25 mm. long, taken on Venus Point Reef, Tahiti, Society Islands, 

 August 5, 1931. Another young specimen, 21 mm. long, was collected 

 in coral, Temukus Roads, Bali, Dutch East Indies, 1931. All collected 

 by the "Alva." 

 Variety tumidus Borradaile. 



Discussion : One specimen in coral at Teviatoa Reef, Raiatea 

 Island, Society Islands, August 21, 1931. This specimen has the sixth 

 abdominal segment with six longitudinal, rounded tubercles that ter- 

 minate posteriorly in acute spines all of which project over the telson. 

 The telson has the proximal portion elevated and ornamented with 

 three thick elongate tubercles, not carinated but not tumid, distally 

 blunted. There is also a small roundish tubercle at the base and 

 slightly outside of each of the long outer tubercles. The distal telsonic 



