20 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 122 



Thalamita prymna (Herbst) 



Cancer prymna Herbst, 1803, pp. 41-2, pi. 57 (fig. 2). 



Thalamita prymna (Herbst). — Alcock, lS99a, pp. 78-9. — Sakai, 1939, pp. 413, 

 416, pi. 51 (fig. 1); 1965, p. 125, pi. 64 (fig. 2) .—Stephenson and Hudson, 

 1957, pp. 346-9, figs. 2R, 3R, pi. 4 (fig. 3), pis. 8L, 9E.— Crosnier, 1962, pp. 

 136-8, figs. 234-6. — Stephenson and Rees, 1967, p. 89. 



Material examined. — 4 males (38.5-63.5 mm), 2 females (40.5- 

 62 mm), Anton Bruun Cr. 1, India, north side Okah Point, Port Okah; 

 Mar. 9, 1963. 2 males (32.5- ca. 48.5 mm) (both without chelae), 

 Anton Bruun Cr. 1, Thailand, Patong Phuket; Mar. 22, 1963; coll. 

 Taylor, Tyler, SterHng, and Rogers. 



Both probably shore collections. 



Remarks. — In the larger specimens the spines on the ridge of the 

 basal antennal joint are largely worn away, with residtant problems 

 in identification (see Stephenson and Rees, 1967, p. 90). 



Distribution.^ — -East Africa and Red Sea to Marshalls and Samoa, 

 including Australia and Japan. 



Thalamita gracilipes (A. Milne Edwards) 



Figures 2d, h 



Thalamonyx gracilipes A. Milne Edwards, 1873, pp. 169-71, pi. 4 (figs. 3, 3a-d). — 

 Alcock, 1899a, pp. 71-2.— Rathbun, 1906, p. 873.— Edmondson, 1954, pp. 

 251-2, figs. 26a, b.— Crosnier, 1962, pp. 91-3, fig. 153 bis a-d. 



Thalamonyx danae var. gracilipes A. Milne Edwards. — Miers, 1886, pp. 192-3. 



Thalamita gracilipes (A. Milne Edwards). — Stephenson and Hudson, 1957, pp. 

 318, 361. 



? Goniosoma (Thalamonyx) danae A. Milne Edwards. — Ortmann, 1894, p. 83. 



Material examined. — Male (10.5mm), Sta. No. B-16. Male 

 (6 mm), ovig. female (11.5 mm), Sta. No. B-34. 



Dredged, 12-24 ft, sandy bottom, lagoons at Cocos Keeling I. 



Remarks.^ — A. Milne Edwards in 1873 listed the diagnostic differ- 

 ences between this species and Goniosoma danae A. Milne Edwards 

 (1869, pp. 153-5, pi. 7: figs. 6, 7): T. gracilipes has an almost entii-e 

 front, a narrower carapace, and longer legs. None of these differences 

 do appear to have diagnostic value and the entirety of the front and 

 carapace breadth appear to depend on the size of the specimen — 

 compare Crosnier (1962, fig. 153 bis a) with A. Milne Edwards (1873, 

 pi. 4: fig. 3). Milne Edwards' descriptions and figures indicate that 

 there is an apparently important difference in the ornamentation of 

 the posterior part of the carapace. In G. danae there are ovoid ele- 

 vations in the mesobranchial area but apparently none in the cardiac 

 region. In T. gracilipes there are four ridges forming an arc, one in 

 each mesobranchial and one in each cardiac region. 



