Boone, Crustacea, Cruise of ''Alva,*' 1931 89 



Carpilius convexus (Forskal). 



Plates 43, 44 and 45. 



Type : Forskal 's type came from the Red Sea. The present deposi- 

 tory is not known. 



Distribution : Red Sea, (Forskal) ; Red Sea, several localities, 

 (Nobili) ; Station 7, Sudanese Red Sea, (Laurie) ; Red Sea, (A. M. 

 Edwards) ; Indo-Pacific region, (Miers) ; Andamans, (Nauck) ; 

 Andamans and Nicobars, (Alcock) ; Maldive Archipelago: Male, 

 Fadifolu, North Male, atolls, reef, lagoon and down to 35 fms. ; 

 Rotuma, (Borradaile) ; Borepata, (Nobili) ; Tahiti, (Ruppell) ; Cey- 

 lon, Flores, Timor, (Ortmann) ; Amboina, Moluccas, (Rathbun; de 

 Man) ; Atjeh, Pontianak, West Borneo, (de Man) ; Schildes Islands, 

 (Herbst) ; Fee Jee Islands, reefs and Sandwich Islands, (Dana) ; 

 Hawaii : Honolulu, reef and market ; Waikiki Beach ; Hilo ; Waiawa 

 Kanai, Oahu, Laysan, (Rathbun) ; Makemo, Paumotu Islands, (Rath- 

 bun) ; Navigator Islands, Seychelles, Mauritius, New Caledonia, Re- 

 union, (A. M. Edwards) ; Port Louis, Mauritius, (Bouvier) ; Ami- 

 rante, Coetivy, (Rathbun) ; Madagascar, (Hoffman) ; Zanzibar and 

 the jungle, (Hilgendorf ) ; Akaba Gulf, East Africa, (Ortmann) ; 

 Zanzibar, Kokotoni and Bawi, East Africa, (Lenz). 



Material examined: Two males and one female collected at 

 Poonarun Reef, Tahiti, Society Islands, August 17, 1931. Two fe- 

 males and one male, collected at Venus Point Reef, Tahiti, August 15, 

 1931. 



Color : Carapace irregularly mottled with deep dark red on lighter 

 red and creamy light ground color. Upper surface of legs also red. 



Technical description: The "Alva" specimens are all of medium 

 size, having a carapace two and one half to three and one half inches 

 wide. The species is reported to a size of six to seven inches carapace 

 width. The entire carapace is smooth except for numerous coarse 

 pores which are more abundant along the anterolateral and frontal 

 margins. The frontal margin is vertically deflected, emphasized by a 

 transverse groove, the medium lobe, not at all, or very slightly bilobed, 

 and separated by only a shallow sinus from the lateral lobes. The 

 superior orbital margin is entire though decidedly thickened, the ex- 

 ternal angle emphasized. In other aspects C. convexus does not dif- 

 fer from C. maculatus. 



References: Cancer convexus Forskal, Descript. et Iconnes Rerum 

 Nat., p. 88, 1775. 



